894 



NEUROLOGY 



It is the largest of the three divisions of the fifth, and is made up of two roots: a 

 large, sensory root proceeding from the inferior angle of the semilunar ganglion, 

 and a small motor root (the motor part of the trigeminal), which passes beneath the 

 ganglion, and unites with the sensory root, just after its exit through the foramen 

 ovale. Immediately beneath the base of the skull, the nerve gives off from its 

 medial side a recurrent branch (nervus spinosus) and the nerve to the Pterygoideus 

 internus, and then divides into two trunks, an anterior and a posterior. 



The Nervus Spinosus (recurrent or meningeal branch) enters the skull through the 

 foramen spinosum with the middle meningeal artery. It divides into two branches, 

 anterior and posterior, which accompany the main divisions of the artery and 

 supply the dura mater; the posterior branch also supplies the mucous lining of 

 the mastoid cells; the anterior communicates with the meningeal branch of the 

 maxillary nerve. 





AURICULAR 

 BRANCHES TO 

 MEATUS 



PAROTID 

 BRANCHES 

 COMMUNICATING 

 TO FACIAL 



OSTERIOH TEMPORAL 



TEMPORAL BRANCH 

 OF BUCCAL 



INFERIOR 

 ALVEOLAR 



MYLOHYOID LINGUAL 



FIG. 781. Mandibular division of the trifacial nerve. (Testut.) 



The Internal Pterygoid Nerve (n. pteryyoideus internus). The nerve to the Ptery- 

 goideus internus is a slender branch, which enters the deep surface of the muscle; 

 it gives off one or two filaments to the otic ganglion. 



The anterior and smaller division of the mandibular nerve receives nearly the 

 whole of the fibers of the motor root of the nerve, and supplies the muscles of 

 mastication and the skin and mucous membrane of the cheek. Its branches are 

 the masseteric, deep temporal, buccinator, and external pterygoid. 



The Masseteric Ner\ T e (n. massetericus) passes lateral ward, above the Pterygoideus 

 externus, in front of the temporomandibular articulation, and behind the tendon 

 of the Temporalis; it crosses the mandibular notch with the masseteric artery, 

 to the deep surface of the Masseter, in \vhich it ramifies nearly as far as its anterior 

 border. It gives a filament to the temporomandibular joint. 



