Anatomia Histologia Embryologia最新文献

{"title":"Morphology of the Tubular Portion of the Digestive Tract of Free-Living Kinosternon scorpioides scorpioides (Linnaeus, 1766)","authors":"Diego Ferreira de Sousa,&nbsp;Andrea Bezerra,&nbsp;Erika Branco,&nbsp;Elane Guerreiro Giese,&nbsp;Ana Rita de Lima","doi":"10.1111/ahe.70043","DOIUrl":"https://doi.org/10.1111/ahe.70043","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Kinosternon scorpioides scorpioides</i> is an omnivorous chelonian with a wide geographical distribution, occurring from Mexico to South America, especially in Brazil. While morphological observations of the species have described its oesophagus, little is known about the other organs constituting the tubular digestive tract. Therefore, the objective of this study was to describe the morphological aspects of the tubular portion of the digestive tract of this species. Ten adult specimens were analysed. After fixation in 10% formalin, organ fragments were embedded in paraffin using the routine histological technique. Sections of 5 μm thick were stained with haematoxylin–eosin (HE), Gomori trichrome (GT) and Alcian blue (AB) pH 0.4 and 2.5. The tubular portion of the digestive tract of <i>K. s. scorpioides</i> consisted of the oesophagus, stomach, small intestine (duodenum, jejunum and ileum), large intestine (caecum and colon) and cloaca. The wall of the tubular portion of the digestive tract of <i>K. s. scorpioides</i> was made up of four concentric layers: Mucosa, submucosa, muscularis externa and adventitia or serosa. The morphology of the tubular digestive tract of adult <i>K. s. scorpioides</i> described in this study shows structural patterns appropriate to their omnivorous feeding habits, such as a simple glandular stomach, long intestines, a well-developed caecum and the production of mucosecretions throughout the digestive tract. This study provides insights into the digestive physiology of the species and provides data for comparative analyses.</p>\u0000 </div>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 4","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144118223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cranial Arterial Perfusion of the Tympanic Bullae Region in Llamas (Lama glama): Anatomic Features and Anomalies","authors":"Timothy M. Chamberlain,&nbsp;David E. Anderson,&nbsp;Robert B. Reed","doi":"10.1111/ahe.70045","DOIUrl":"https://doi.org/10.1111/ahe.70045","url":null,"abstract":"<p>The tympanic bulla of South American camelids is a unique multi-compartmental structure with an internal architecture resembling that of honeycomb. This unique configuration creates surgical challenges for the treatment of refractory otitis media cases in llamas (<i>Lama glama</i>). Surgical interventions for otitis media in the llama can result in life-threatening arterial haemorrhage. Surgery in lesser described species, such as camelids, can result in unanticipated complications when surgeons rely solely on anatomic extrapolation of similar species. Descriptive anatomy of llama vascular structures surrounding the tympanic bulla is lacking in the published record. To elucidate the arterial pattern of the tympanic bulla region of the llama with the intent of identifying unexpected arterial structures, 10 llama heads were dissected and all major arterial structures were identified, described and compared to computed tomography scans of contrast-enhanced arterial latex. Bilateral variations of the caudal auricular, superficial temporal and transverse facial arteries were found to result in an arterial trunk lying immediately adjacent to the lateral margin of the tympanic bulla in the llama. The arterial structure situated at the lateral margin of the tympanic bulla interferes with direct surgical access to the tympanic bulla by standard surgical techniques. These unique anatomic variations in the llama may be responsible for the risk of life-threatening haemorrhage during surgery that results in abandonment or failure of the procedure.</p>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 4","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ahe.70045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptations of the Vertebrate Retina to Low-Light Conditions: A Review","authors":"R. Cobo,&nbsp;A. Navarro-Sempere,&nbsp;Y. Segovia,&nbsp;M. García","doi":"10.1111/ahe.70042","DOIUrl":"https://doi.org/10.1111/ahe.70042","url":null,"abstract":"<p>Vision is a critical sensory modality in vertebrates, enabling diverse adaptations to environmental challenges. This review explores the remarkable adaptations of vertebrate eyes to low-light environments, such as nocturnal habitats, deep-sea ecosystems and subterranean niches. Key structural and functional modifications include enhanced eye size, rod-dominated retinas, reflective tapetal layers and photopigment spectral tuning. The role of photoreceptor specialisation and retinomotor movements in optimising photon capture and minimising light scatter is examined, alongside evolutionary trade-offs that prioritise sensitivity over resolution. Furthermore, adaptations such as bioluminescence detection in deep-sea fish and the regressive evolution of vision in subterranean species highlight the intricate relationship between ecological demands and visual evolution. By synthesising current research, this review provides insights into the evolution in vertebrate visual systems and offers future perspectives on the molecular and ecological drivers of these adaptations.</p>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 4","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ahe.70042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biomechanical and Microbiological Analysis of Canine Cadavers Fixed With Ethyl Alcohol Formaldehyde Mixtures for Anatomy and Surgery Education","authors":"Sérgio S. Alves Jr,&nbsp;Andréa B. P. S. Queiroz,&nbsp;Nathalia T. Brandão,&nbsp;Geovana C. Ferreira,&nbsp;Raphael C. Zero,&nbsp;Fabrício S. Oliveira","doi":"10.1111/ahe.70040","DOIUrl":"https://doi.org/10.1111/ahe.70040","url":null,"abstract":"<p>In Brazil, with the creation of the Arouca Law in 2009 and the need for substitutes for live animals in studies, it is essential to apply anatomical techniques to conserve corpses. Fixative substances prevent autolysis, facilitate incisions and make the protein fraction of the tissue insoluble, preserving its morphology due to antiseptic properties. Preservative solutions aim to maintain anatomical specimens intact to allow the long-lasting use of them. Several techniques can promote such fixation and preservation, but formaldehyde is the most used in many countries. This research aims to determine the viability of a new anatomical technique using ethyl alcohol (EA) and formaldehyde, in different proportions, to fix canine cadavers and sodium chloride aqueous solution (SCAS 30%) for preservation biomechanical and microbiological analyses. Fresh samples were collected before fixation to be the control samples in every group. Corpses were divided into four groups: G1 (only formaldehyde), G2 (30% formaldehyde and 70% EA), G3 (70% formaldehyde and 30% EA) and G4 (50% formaldehyde and 50% EA) and were subsequently conserved in 30% SCAS. Analyses were done at D0 (before fixation), D30, D60, D90 and D120 after preservation on 30% SCAS. Biomechanical traction tests were performed on skin and jejunum samples at all times of fixation and preservation. Microbiological analyses of the solution were at the end of fixation and during all preservation moments. The control samples (fresh corpses) were compared to the other four groups with the T-test. There was no statistical difference in the maximum rupture force (MRF) of the skin and jejunum between the control and the fixation and preservation moments. It was observed that G2 and G3 presented minor variations in the MRF with means of skin (−14.2 N) and jejunum (−0.28 N). There were significant differences at all times for rupture elongation (RE) of the skin and jejunum. G3 and G4 showed minor variations in the RE, with a difference between the skin (1.32 mm) and jejunum (0.23 mm). The microbiological analyses of the SCAS 30% did not show any contamination (aerobic and anaerobic microorganisms) for Groups 1, 2 and 3. For D120 of G4, <i>Bacillus</i> spp. was identified in the amount of 1.0 × 10.</p>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ahe.70040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Topiramate on the Cerebellum of the Obese Female Rats: A Stereological, Histochemical and Bioinformatical Study by Investigation of TNF-α Interaction","authors":"Işınsu Alkan,&nbsp;Berrin Zühal Altunkaynak,&nbsp;Amir Mahdi Akbari,&nbsp;Ceren Erdem Altun,&nbsp;Cengiz Baycu","doi":"10.1111/ahe.70041","DOIUrl":"https://doi.org/10.1111/ahe.70041","url":null,"abstract":"<div>\u0000 \u0000 <p>The rising incidence of obesity underscores the necessity for alternative obesity treatments. Patients commonly prefer medication aiding in weight reduction. Topiramate, an antiepileptic drug, is gaining popularity among obese patients for its weight loss benefits. This study aims to explore Topiramate's impact on the cerebella of obese female rats. In the experiment, 24 female rats (200–250 g) were divided into four groups: non-obese control (NOC), obese control (OC), non-obese topiramate (NOT) and obese topiramate (OT). The non-obese rats were given a standard diet, while the obese rats received a high-fat diet (40% fat). After 9 weeks, topiramate was administered intraperitoneally daily for 6 weeks. Following this, the rats were euthanised, and their cerebella were removed. The volume of the cerebellum and mean numerical density of the molecular neurons, granular neurons and Purkinje cells were estimated using stereological methods, and the link between obesity-caused cerebellum damage and TNF-α was assessed through immunohistochemical and bioinformatic techniques. Additionally, histopathological evaluations of the tissues were conducted. The cerebellar volume in the OC group was decreased compared to the NOC group. The topiramate groups exhibited a decrease in molecular or/and granular neuron numbers in the NOT and OT groups. Notably, neurons with dark cytoplasm were observed in the topiramate-treated groups, alongside neuronal degeneration was seen in the obese groups. The connection between TNF-α and obesity or obesity-caused cerebellum damage was confirmed through both immunohistochemical and bioinformatics analyses. These findings suggest that topiramate might have a degenerative effect on the cerebellum, especially following obesity.</p>\u0000 </div>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Immunohistochemical Detection of Major Immunocompetent Cells and Cell Proliferation in Peripheral Lymphoid Organs in Cattle and Yak (Bos gruniensis)","authors":"Almazbek Irgashev,&nbsp;Eliza Asanova,&nbsp;Zakiia Kalandarova,&nbsp;Gil Jae Cho,&nbsp;Svetlana Ishenbaeva","doi":"10.1111/ahe.70039","DOIUrl":"https://doi.org/10.1111/ahe.70039","url":null,"abstract":"<div>\u0000 \u0000 <p>This study aimed to identify and analyse the distribution and functional activity of the main types of immunocompetent cells and to assess the level of cell proliferation in lymph nodes and spleen, as well as to identify species-specific differences in the immune system. The main results of the study detailed how T-lymphocytes, B-lymphocytes and macrophages organise and function in the lymph nodes and spleen, identifying specialised zones for cell-mediated and humoral immune response. A high concentration of T-lymphocytes was found in the paracortical (T-dependent) zone of lymph nodes, whereas B-lymphocytes were predominantly localised in lymphoid follicles (B-dependent zone), highlighting the specific organisation of immune defence. The spleen, which provides both humoral and cell-mediated immune response, showed the presence of periarteriolar lymphoid sheaths rich in T-lymphocytes (T-dependent zone) and lymphoid follicles with a high concentration of B-lymphocytes (B-dependent zone). In addition, the presence of macrophages, which play a key role in phagocytosis and antigen presentation, was confirmed in both organs. Immunohistochemical analysis revealed active proliferation of immunoblasts in response to immune challenges, indicating the dynamic nature of the immune response. These data emphasise the complexity and efficiency of the immune system of the studied species, providing their protection against infectious agents and maintaining their health, which is key for the development of new approaches to improve animal health and productivity.</p>\u0000 </div>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploration of Dentition Development and Replacement in Two Forms of Mexican Tetra (Astyanax mexicanus)","authors":"Zheng Fang,&nbsp;Devi Atukorallaya","doi":"10.1111/ahe.70038","DOIUrl":"https://doi.org/10.1111/ahe.70038","url":null,"abstract":"<p>There are two main subforms of the teleost fish Mexican tetra (<i>Astyanax mexicanus</i>): the river-dwelling surface fish and the cave-dwelling blind cavefish. Recently, this species has become a popular animal model in developmental biology research. It was reported that cavefish bore more teeth than surface fish; however, a detailed description of oral dentition development and replacement in the Mexican tetra remains unavailable. In this study, we investigated the differences in tooth count between surface fish and cavefish by characterising the features of mandibular dentition in adult Mexican tetras and explored the process of first-generation dentition development in larval fish. Regarding early dentition development, larval surface fish and Pachón cavefish at 12-, 18-, 21-, 24-, and 30-days post-fertilisation were euthanised. Haematoxylin and eosin staining was performed for histological analysis, and immunohistochemistry was employed to detect the expression of the odontogenic marker Sox2. The results show that Mexican tetras replaced functional teeth via the successional dental lamina marked by Sox2 expression. Adult Pachón cavefish possessed more intraosseous replacement teeth. Mandibular tooth development in larval fish was also marked by Sox2 expression, and no evidence supported tooth development in a continual dental lamina. Our findings describe the appearance of a successional dental lamina in tooth replacement in the Mexican tetra but provide no evidence regarding a continual dental lamina. In the Mexican tetra, teeth of the first-generation dentition may develop independently. The results of this project will offer valuable histological information for future research into tooth development in the Mexican tetra.</p>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ahe.70038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing Manual and Automated Landmarking Accuracy in Geometric Morphometrics: A Study on Cattle Skulls and Distal Phalanges","authors":"Tomasz Szara,&nbsp;Buket Çakar,&nbsp;Burak Ünal,&nbsp;Funda Yiğit","doi":"10.1111/ahe.70036","DOIUrl":"https://doi.org/10.1111/ahe.70036","url":null,"abstract":"<div>\u0000 \u0000 <p>Geometric morphometric studies often rely on accurate landmark placement to analyse shape and size variations. Manual and automated landmarking methods are widely used, but their performance can vary depending on the anatomical structure and complexity. This study compares manual and automated landmarking accuracy in two anatomical samples: the skull and the distal phalanx. Fifteen Holstein cattle skulls and 15 distal phalanges were analysed. Two landmark configurations were used: 10 and 20 landmarks for the skull and 5 and 10 landmarks for the distal phalanx. Both manual and automated landmarking were performed using Slicer software. Procrustes distance and centroid size were calculated to assess shape and size differences. ANOVA was applied to evaluate statistical differences, and PCA was conducted to visualise shape variations. Procrustes distance revealed significant differences between manual and automated landmarking for most configurations, particularly in the skull, highlighting the variability introduced by automated methods. No significant differences were observed for centroid size, indicating consistency in size measurements. Automated landmarking showed increased variability in capturing shape, especially in complex structures and higher landmark densities. Automated landmarking provides efficiency but introduces significant shape variability, particularly in complex anatomical structures. Our findings highlight the superior accuracy of manual landmarking, particularly for capturing subtle anatomical features and complex structures where automated methods face challenges. Although more time-consuming, manual landmarking minimises variability and preserves crucial morphological details, making it essential for precise analysis, especially in the presence of thresholding artefacts in 3D models. Future research should explore multiple software platforms and refine automated algorithms to improve performance in morphometric analyses.</p>\u0000 </div>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin and Distribution of the Brachial Plexus Nerves in Northern Tamandua (Tamandua mexicana)","authors":"María José Monroy-Cendales,&nbsp;Paola Andrea Velazco-Castaño,&nbsp;Fabian Castañeda-Herrera,&nbsp;Maria Angelica Miglino,&nbsp;Juan Fernando Vélez-García","doi":"10.1111/ahe.70037","DOIUrl":"https://doi.org/10.1111/ahe.70037","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Tamandua mexicana</i> is a species of the superorder Xenarthra that is found in many regions of Mexico, Peru, Colombia, Ecuador and Venezuela. This species is important because it is a model for comparative studies of the evolutionary anatomy of xenarthrans. However, there are few anatomical studies on which to base these areas, such as the anatomy of the brachial plexus. Several studies use the brachial plexus anatomy for phylogenetic analysis and medical procedures. Thus, this study aimed to describe the origin and distribution of the brachial plexus in <i>T. mexicana</i>. Twelve specimens of <i>T. mexicana</i> fixed in formaldehyde 4% were dissected. The ventral spinal nerves from C5 to T2 originated the brachial plexus. In most cases, C5–C7 formed the cranial trunk, C6–C7 the middle trunk and C8–T1 the caudal trunk. In all specimens, these trunks joined and formed the common trunk, which distally divided into two divisions: dorsal and ventral. The pectoralis cranialis, pectoralis caudalis, thoracicus longus, thoracicus lateralis and thoracodorsalis nerves supplied the extrinsic thoracic limb muscles. The innervation for the intrinsic thoracic limb muscles was supplied by the suprascapularis, subscapulares, axillaris, musculocutaneus, radialis, medianus and ulnaris nerves. The intercostobrachialis, axillaris, radialis, ulnaris, medianus and caudal cutaneous antebrachial nerves innervated the skin of this species. The trunks and divisions were similar comparatively to those reported in other xenarthrans. However, <i>T. mexicana</i> was more similar to sloths. This suggests a phylogenetic trade in their evolution. The origin and distribution of the brachial plexus nerves resembled those of the other Xenarthras, which can assist in medical procedures within the superorder.</p>\u0000 </div>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ansa Spiralis Variation in the Ascending Colon of Sheep","authors":"Sokol Duro,&nbsp;Ozan Gündemir,&nbsp;William Pérez,&nbsp;Catrin S. Rutland,&nbsp;Tomasz Szara","doi":"10.1111/ahe.70035","DOIUrl":"https://doi.org/10.1111/ahe.70035","url":null,"abstract":"<div>\u0000 \u0000 <p>Sheep (<i>Ovis aries</i>) are ruminant animals, and a key feature they share with other species in this classification is the structure of the ascending colon, specifically the ansa spiralis (also commonly called the spiral ansa, spiral colon or <i>ansa spiralis coli</i>). In sheep, this structure generally forms a discoid spiral, consisting of two to four centripetal gyri, which transition at the central flexure into two to four centrifugal gyri, but some sheep exhibit deviations from this classic form. Current anatomical textbooks and scientific articles lack detailed descriptions relating to all of these possible variations of ansa spiralis in this species. This study identified and documented all of the deviations and their frequencies. The study was conducted from carcasses collected at a slaughterhouse in Tirana, Albania. In total, 555 large intestines from randomly selected sheep over the age of 6 months were evaluated. No records were kept regarding specific age, sex, breed, or region of origin. Among the 555 large intestines, 52 (9.37%) exhibited different ansa spiralis shapes compared to the classical form. Among these irregularly shaped samples, 12 distinct variations were discovered. This study offers valuable insights into the sheep large intestine morphology and lays the groundwork for further research. Future studies could focus on detailing ansa spiralis vascularization or investigating the relationships between ansa spiralis shape deviations, frequencies and factors such as sex, breed, age, diet and region.</p>\u0000 </div>","PeriodicalId":49290,"journal":{"name":"Anatomia Histologia Embryologia","volume":"54 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}