Anatomischer Anzeiger最新文献_第9页

The development of the chick embryo gallbladder studied by scanning electron microscope. 用扫描电镜研究了鸡胚胆囊的发育过程。

Anatomischer Anzeiger Pub Date : 1990-01-01

S Gheri Bryk, G Gheri, P Pacini

引用次数: 0

Photoreceptor fine structure in light- and dark-adaptation in the butterfly fish (Pantodon buchholzi). 蝴蝶鱼适应光暗的光感受器精细结构。

Anatomischer Anzeiger Pub Date : 1990-01-01

C R Braekevelt

{"title":"Photoreceptor fine structure in light- and dark-adaptation in the butterfly fish (Pantodon buchholzi).","authors":"C R Braekevelt","doi":"","DOIUrl":"","url":null,"abstract":"The morphology of the retinal photoreceptors of the butterfly fish Pantodon buchholzi has been studied by electron microscopy in both light- and dark-adaptation. The photoreceptors in this species are readily divisible into rods and cones based on morphological criteria. No double or twin cones are present. The rod photoreceptors show marked retinomotor movements. In light-adaptation they are extremely elongate cells while in the dark-adapted state they are much shorter. Cones seem to respond but minimally to the circadian cycle. Rod outer segments are composed of membranous discs of uniform diameter displaying several incisures. The inner segment has a small distal ellipsoid and a thin myoid region which is lost in dark-adaptation. The nuclei of rods are condensed and always located vitread to the external limiting membrane. The rod synaptic spherule displays 2 or 3 invaginated sites. The single cones display a tapering outer segment. The wider inner segment contains a large electron-dense ellipsoid with small glycogen deposits located peripherally. The cone nuclei are large and vesicular and usually located sclerad to the external limiting membrane. The synaptic pedicle of cones is larger and more electron-lucent and contains more synaptic sites than do the rods. No mosaic pattern of arrangement of the photoreceptors is apparent. Except for the obvious lengthening or shortening of the rods, the morphology of the photoreceptors changes but little during the circadian cycle.","PeriodicalId":72195,"journal":{"name":"Anatomischer Anzeiger","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13243301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Postnatal development of the masticatory muscles of the Wistar rat (Rattus norvegicus Berkenhout). A histochemical study]. Wistar大鼠(Rattus norvegicus Berkenhout)咀嚼肌的产后发育。组织化学研究]。

Anatomischer Anzeiger Pub Date : 1990-01-01

R Kowalewski, M Miltzow

引用次数: 0

Ultrastructural study of germinal center macrophages in peripheral lymphoid organs of the rat. 大鼠外周血淋巴器官生发中心巨噬细胞的超微结构研究。

Anatomischer Anzeiger Pub Date : 1990-01-01

N M Milićević, Z Milićević, M Colić

引用次数: 0

Historical aspects of the International Federation of Associations of Anatomists. 国际解剖学家协会联合会的历史方面。

Anatomischer Anzeiger Pub Date : 1990-01-01

L J DiDio

引用次数: 0

An ultrastructural study of development of the leptomeninx of the rabbit spinal cord. 兔脊髓细筋膜发育的超微结构研究。

Anatomischer Anzeiger Pub Date : 1990-01-01

R R Sturrock

引用次数: 0

Prenatal development of the human Brunner's glands. 人类布鲁纳氏腺的产前发育。

Anatomischer Anzeiger Pub Date : 1990-01-01

K G Botros, S L el-Hady, E A el-Mohandes

{"title":"Prenatal development of the human Brunner's glands.","authors":"K G Botros, S L el-Hady, E A el-Mohandes","doi":"","DOIUrl":"","url":null,"abstract":"The prenatal development of the human Brunner's glands has been investigated in 23 fetuses from the 10th week of gestation to full-term. At 12 weeks, a few cords of epithelial cells were seen budding from the duodenal mucosa immediately beyond the pyloric sphincter. They represent the initial stage of the development of Brunner's glands. At 16 weeks, Brunner's glands originated as simple tubular downgrowths from the bottoms of the most proximal crypts of the duodenum. The secretory products of the component cells of these primitive tubules contained periodic acid schiff (PAS) positive material which was largely supranuclear in position and resisted digestion by diastase. From 20 weeks to full term, the Brunner's glands developed in a progressive fashion starting in the proximal part of the duodenum near the pyloroduodenal junction. Further tubular downgrowths were added distally, leading to an increase in length of the glandular tissue. The gland showed an increase in size proximally due to elongation and branching of the tubules. At birth, the glandular cells of Brunner's glands resembled those of normal adult in structure and staining reactions. The PAS staining of the cells of the early developed glands (at 12 weeks) was as intense as those of the full-term. The secretory materials of the developed Brunner's glands showed negative reaction with Alcian blue (AB) at pH 2.5 at any stage of development. These results suggest that the mucin secreted by the developed Brunner's glands of human is neutral mucopolysaccharide in nature.","PeriodicalId":72195,"journal":{"name":"Anatomischer Anzeiger","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13550474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variation in length and termination of the ramus circumflexus of the human left coronary artery. 人类左冠状动脉旋支长度和终止的变化。

Anatomischer Anzeiger Pub Date : 1990-01-01

C A Baptista, L J DiDio, G Teofilovski-Parapid

引用次数: 0

Development of the definitive kidney in albino rat. 白化大鼠最终肾的发育。

Anatomischer Anzeiger Pub Date : 1990-01-01

N H Koura

引用次数: 0

Anatomical basis for transplantation of microsurgical anastomosed autologous and allogenic bone transplantants for reconstruction of the mandible in animal experiments (Göttingen-Minipig). 显微外科吻合自体和异体骨移植重建下颌骨动物实验的解剖学基础(Göttingen-Minipig)。

Anatomischer Anzeiger Pub Date : 1990-01-01

K Pohlmeyer, R Schmelzeisen, C Bötel

引用次数: 0