primitive anus
... 原肛窝 Proctodaeal pit 原肛 Proctodaeum 前胎,假胎 Proembryo ...
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原肛窝 Proctodaeal pit
肛凹或原肛 proectoduem
一穴肛原癌 cloacogenic cancer
在发育过程中,口凹是在第三期无节幼虫时内陷形成,而原肛是在第六期无节幼虫时内陷形成的,所以口凹的发生早于原肛的发生。
In the course of development, the invagination of stomodeum occurs earlier than that of proctodeum at the third and the sixth nauplius stages respectively.
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