TEMPORAL AND INFRATEMPORAL REGIONS 275 



Nervus Mandibularis. The mandibular branch of the 

 trigeminal nerve arises within the cranium from the semilunar 

 (O.T. Gasserian) ganglion, and enters the infratemporal 

 region through the foramen ovale. It is composed of 

 sensory fibres, but it is accompanied through the foramen 

 by the small motor root of the trigeminal nerve ; and by the 

 union of the sensory and motor parts, immediately after 

 they gain the exterior of the cranium, a mixed nerve-trunk 



Facial nerve 



Tympanic plexus 



Tympanic branch of 

 glosso-pharyngeal 



Chorda tympani /' 



Auriculo-temporal ' 

 Inferior alveolar nerve 



Stylo-glossus 

 Mylo-hyoid nerve 



.. Anterior deep temporal 

 Buccinator nerve 



Mylo-hyoid muscle ' 

 branches of mylo-hyoid nerve / 



Communication to hypoglos; 



Submaxillary ganglion 



Hyoglossus 



Genio-glossus 



ental branch 

 Incisive branch 

 Digastric 



FIG. 113. Diagram of Mandibular Nerve. By Prof. A. M. Paterson. 



1. Ganglion geniculi 



2. Carotico-tympanic nerve 



3. Small superficial petrosal nerve 



4. Internal carotid artery 



5. Middle meningeal artery 



6. Symp. root of otic ganglion 



7. Otic ganglion 



8. Nerve to tensor tympani 



9. Nerve to tensor palati 



10. Nerve to internal pterygoid 



11. Mandibular nerve trunk 



12. Anterior division 



13. Masseteric and post, deep 



temporal 



14. Lingual nerve 



J 5 \ Pterygoid branches 



results. This nerve-trunk lies medial to the external pterygoid 

 muscle and lateral to the tensor palati, and after a very short 

 course (not exceeding 5 mm.) it ends by dividing into 

 two parts, named the anterior and posterior divisions of the 

 mandibular nerve (Fig. 113). 



The trunk of the mandibular nerve gives off two branches 

 before it divides, viz., (i) nervus spinosus (O.T. recurrent nerve ), 

 and (2) the nerve to the internal pterygoid muscle. 



The nervus spinosus is a very slender twig which enters 



ii 18 a 



