mandibular arch n.
The first postoral arch in the series of branchial arches. Also called mandibular process.
The posterior part lies completely within the mandibular arch.
Behind the mandibular arch are present a well-developed hyoid (hy) and a first branchial arch (not shewn in fig. 146).
The hyoid arch has a number of ossifications in it and is closely connected with the mandibular arch.
It may be noted as a peculiarity of the mandibular arch that it is never provided with an unpaired basal element.
(a) The first or mandibular arch is the largest of the series, and forms the upper and lower jaws.
The mandibular arch is divided into two elements, which form respectively the upper and lower jaws.
A shallow but well-marked depression on each side of the head indicates the posterior boundary of the mandibular arch.
The history of the mandibular arch is more complicated than that of the hyoid.
In spite of these attachments the mandibular arch continues to be partially supported by the hyomandibular.
The hyoid arch is small and is broadly overlapped by the mandibular arch.