Scholarlink

The primitive hindgut and the allantois terminate as the cloaca. The cloaca is divided by the urorectal septum into the ventral urogenital sinus and the dorsal anorectum. The boundary between the cloaca and ectoderm is the cloacal membrane. The proctodeum (anal pit) develops inferior to the posterior cloacal membrane (the anal membrane). Rupture of the anal membrane creates the anal opening. The pectinate (dentate line) is located at the former site of the anal membrane.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Embryology-Anorectal

  • 章节

  • 发表日期：

    2025年

查看全文
  • James S. Wu,
  • Ursula M. Szmulowicz,
  • Richard L. Drake

摘要

The primitive hindgut and the allantois terminate as the cloaca. The cloaca is divided by the urorectal septum into the ventral urogenital sinus and the dorsal anorectum. The boundary between the cloaca and ectoderm is the cloacal membrane. The proctodeum (anal pit) develops inferior to the posterior cloacal membrane (the anal membrane). Rupture of the anal membrane creates the anal opening. The pectinate (dentate line) is located at the former site of the anal membrane.