precervical sinus -->
cervical sinus
medical dictionary

In young mammalian embryos a depression in the nuchal region caudal to the hyoid arch, with the third and fourth branchial arches and ectodermal grooves in its floor; normally it is obliterated after the second month, but occasionally cervical fistulae persist as vestiges of it.

Synonyms: precervical sinus.

(05 Mar 2000)