The two somites following the mandibular or first post-oral or buccal somite carry appendages modified as maxillae.
D, Deuterocerebrum, consisting of ganglion cells belonging to the second or mandibular somite.
The more anterior fibers insert fleshily on the mandibular fossa.
(a) The first or mandibular arch is the largest of the series, and forms the upper and lower jaws.
In Scyllium the hyoid and mandibular arches are at first very similar to those which follow.
