A cleft lip results when
A)the two halves of the secondary palate do not fuse.
B)the frontonasal and maxillary processes do not fuse.
C)the lateral edges of the nasal placodes do not fuse with the maxillary processes.
D)the maxillary processes do not fuse with the mandibular processes.
E)None of these choices is correct.

Question

Quizplus · Accepted Answer

A cleft lip occurs when there is a failure of fusion between the frontonasal process (which forms the middle part of the upper lip) and the maxillary process (which forms the sides of the upper lip). This typically occurs during embryonic development. Choice A describes a cleft palate, which is a separate condition. Choices C and D describe fusion between different embryonic structures that do not contribute to the formation of the upper lip.

A Cleft Lip Results When