A newborn has a unilateral cleft of the upper lip. Failure of fusion between which embryonic structures produced this defect?
- Correct answer
Medial nasal process and maxillary process
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Lateral nasal process and maxillary process
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Right and left palatal shelves
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Right and left mandibular processes
This question is one of 15 in AFK practice: Biomedical sciences. Test yourself on all of them.
Practice quiz FlashcardsExplanations
The upper lip forms when the maxillary process merges with the medial nasal process; failure on one side gives a unilateral cleft lip. Failure of the palatal shelves to fuse causes cleft of the secondary palate, not the lip.
Source: Sadler, Langman's Medical Embryology — oneguy
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