neuropore การใช้

In human embryos, the cranial neuropore closes approximately on day 24 and the caudal neuropore on day 28.
In human embryos, the cranial neuropore closes approximately on day 24 and the caudal neuropore on day 28.
Failure of the cranial ( anterior ) and caudal ( posterior ) neuropore closure results in conditions called anencephaly and spina bifida, respectively.
Some believe, however, that it occurs later in development, around the fourth week of gestation, at which time the two embryos fuse together near the anterior open neuropore.
The coalescence of the neural folds occurs first in the region of the hind-brain, and from there extends forward and backward; toward the end of the third week the front opening ( anterior neuropore ) of the tube finally closes at the anterior end of the future brain, and forms a recess which is in contact, for a time, with the overlying ectoderm; the hinder part of the neural groove presents for a time a rhomboidal shape, and to this expanded portion the term sinus rhomboidalis has been applied.