Evolution of vertebrates
involved:
n Development of organs of special sense in head
region to detect prey
n Development of a large neural circuitry (the brain)
to integrate input and responses
n Development of an effective feeding apparatus
(jaws: pharyngeal arch derivatives)
n Development of an improved respiratory
apparatus (gills: pharyngeal arch derivatives). This
required the recruitment of an existing group of
cells: neural crest cells, for a new role.