人类胚胎期和胎儿早期的锥体肌形成。

IF 1.3 4区 医学 Q3 PEDIATRICS
Yui Iwasa, Toru Kanahashi, Hirohiko Imai, Hiroki Otani, Shigehito Yamada, Tetsuya Takakuwa
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引用次数: 0

摘要

锥体肌(PM)是腹部前壁的成对小三角肌,但其生理意义尚不清楚。最近的研究未能在胚胎期检测到这块肌肉。因此,本研究旨在利用高分辨率磁共振成像确定 PM 出现的时间并揭示其特征。本研究选择了卡内基期(CS)18 和 CS23 之间的 14 个胚胎和 59 个胎儿(冠臀长:39.5-185.0 毫米)。在 CS20 期的三个样本中,有一个样本首次检测到 PM。在 CS21 至 CS23 期间的 7 个样本中,有 5 个样本(71.4%)检测到可吸入颗粒物。胎儿早期的 48 个样本(81.4%)左右两侧均有 PM,3 个样本(5.1%)仅右侧有 PM。8个样本(13.6%)没有 PM。没有发现胎侧差异或性别二态性。在大多数样本中, PM的长度大于宽度,尽管不同样本的长宽比有所不同。PM/ 腹直肌长度和 PM/ 脐骨-耻骨联合长度比几乎恒定,与冠-臀长度无关。PM 位于腹直肌的腹侧下方,比腹直肌更靠近下肢内侧肌群。本研究结果表明,胚胎晚期就已形成胎头肌,胎头肌在胎儿早期的出现频率、两侧差异、性别二形性和空间位置与成人相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pyramidalis muscle formation during human embryonic and early fetal periods

The pyramidalis muscle (PM) is a paired small triangular muscle of the anterior abdominal wall; however, its physiological significance is unclear. Recent studies have failed to detect this muscle during embryonic period. Hence, the present study aimed to determine the time when PM is emerging and reveal its features using high-resolution magnetic resonance imaging. Fourteen embryos between Carnegie stage (CS)18 and CS23 and 59 fetuses (crown-rump length: 39.5–185.0 mm) were selected for this study. The PM was first detected in one of the three samples at CS20. It was detected in five of the seven samples (71.4%) between CS21 and CS23. Forty-eight samples (81.4%) at early fetal period had PMs on both the right and left sides, and 3 (5.1%) had it only on the right side. Eight samples (13.6%) had no PMs. No side-differences or sexual dimorphisms were detected. The PM length was larger than the width in most samples, although the length/width ratio varied among the samples. The PM/rectus abdominis muscle length and PM/umbilicus-pubic symphysis length ratios were almost constant, irrespective of the crown-rump length. The PM was located ventrally inferior to the rectus abdominis and closer to the medial muscle groups of the lower limb than the rectus abdominis. The present study demonstrated that PM formation occurred in the late embryonic period, and that the frequency, side differences, sex dimorphism, and spatial position of the PM in the early fetal period were similar to those in adults.

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来源期刊
Congenital Anomalies
Congenital Anomalies PEDIATRICS-
自引率
0.00%
发文量
49
审稿时长
>12 weeks
期刊介绍: Congenital Anomalies is the official English language journal of the Japanese Teratology Society, and publishes original articles in laboratory as well as clinical research in all areas of abnormal development and related fields, from all over the world. Although contributions by members of the teratology societies affiliated with The International Federation of Teratology Societies are given priority, contributions from non-members are welcomed.
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