Finally there is evidence for an adductor between the temporal and masseter masses.
Like the masseter, the temporal is an elevator of the lower jaw.
Consequently, the masseter was able to extend from an anterodorsal origin to a posterior and ventral insertion.
There is often a very much enlarged infra-orbital foramen through which passes a part of the masseter muscle.
There was synchronous spasm in the masseter muscles, resulting in elevation of the inferior maxilla.
This ridge presumably marks the upper limits of the origin of the masseter from the squamosal.
The muscles of this group which specially interest us are the masseter and the temporal.
The masseteric fossa receives the insertion of the rostral or superficial division of the masseter muscle.
The opening of the sinus is most commonly situated at the under margin of the mandible a little in front of the masseter muscle.
Presumably the muscle was sheetlike and attached to the skull roof, medial to the attachment of the masseter.