Question

Neural crest cells appear on the edges of the neural tube and spread throughout the embryo, giving rise to all of the following structures except __________.

A) sensory capsules in which eyes and other sense organs develop
B) pharyngeal slits (or clefts) of invertebrate chordates
C) some of the bones and cartilage of the skull
D) several types of neurons
E) teeth

Answer 1

Ans.

Neural crest cells are embryonic cells that are unique to organisms of phylum chordata. These cells give arise a number of cell lineage, such as bone and cartilage, melanocytes, smooth muscle, glia and neurons, eyes, teeth, and other sense organs. The neural crest cells do not form pharyngeal slits in invertebrate chordates.

Thus, the correct answer is option b).