Fig. 5 VIEW OF THE DEEPER PARTS OF THE FACE AND NECK AFTER THE REMOVAL OF THE PARTS DESCRIBED IN THE PRECEDING FIGURES
In the center of the figure, deep in the infratemporal fossa, emerge the branches of the mandibular nerve (32); this nerve is the third division of the trigeminalor fifth cranial (V), the principal sensory nerve of the head. These branches, variously named, radiate in all directions as they pass to the parts that they supply: aurioculotemporal nerve (7) twisting between the external auditory meatus and the articular fossa (17) of the jaw joint left after removal of the mandibular ramus (38b in Fig. 2); inferior dental nerve (21) for the lower jaw; lingual nerve (34) for the tongue and mouth; deep temporal, motor, branches (33), and others. The medial pterygoid muscle (24) is seen in almost its entire length.The facial artery (13) emerges from below the body of the lower jaw. It passes in company with the anterior facial vein (14a) across the face toward the nose. A window below the eye affords a view ofthe maxillary sinus or air cavity contained in the upper jaw-bone.