Which one of the following statements about somites is NOT true?
A. The sclerotome develops into the vertebrae and skull.
B. The myotome develops into skeletal muscle.
C. The dermatome develops into skin.
D. Somites are added in a caudal-to-rostral direction.
E. Somites develop adjacent to the neural groove.
ANS: D
Rationale: Somites initially appear in the occipital region, adjacent to the neural groove, and are added in a rostral-to-caudal direction. The anteromedial sclerotome becomes the vertebrae and skull, the posteromedial myotome develops into skeletal muscle, and the lateral dermatome develops into the dermis.
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