THE HEAD AND NECK 



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branches, namely, buccal, supramandibular, and inframandibular 

 or cervical. 



The buccal branches pass forwards over part of the masseter and 

 the buccinator muscles to the angle of the mouth. They supply 

 the buccinator and the outer part ot the orbicularis oris, and are 

 connected with the infra-orbital branches of the temporo-facial 

 division, and with the long buccal nerve, which is a branch of the 

 inferior maxillary division of the fifth nerve. The latter communica- 

 tions take the form of a plexus situated on the superficial surface 

 of the buccinator muscle, called the buccal plexus. 



The supramandibular branches pass forwards over the mandible 

 to the region below the lower lip. They supply the lower part of 

 the orbicularis oris, depressor anguli oris, depressor labii inferioris, 



Fig. 479. — Diagram of the Sensory Nerves of the Right Side 

 OF THE Head. 



1. Supra-orbital 



2. Supratrochlear 



3. Infratrochlear 



4. Nasal 



5. Lachrymal 



6. Temporal of Orbital 



7. Malar of Orbital 



8. Infra-orbital 



g. Auriculo-temporal 

 10. Long- Buccal 



11. Mental 



12. Great Auricular 



13. Small Occipital 



14. Great Occipital 



and levator menti muscles. They communicate with the mental 

 branch of the inferior dental from the inferior maxillary nerve, under 

 cover of the depressor anguli oris. 



The inframandibular or cervical branch descends beneath the 

 upper part of the platysma myoides and the deep cervical fascia 

 to the suprahyoid region. Having pierced the deep fascia, it divides 

 into branches which curve forwards and supply the platysma on 

 its deep surface. It communicates freely with the upper branch of 

 the superficial cervical nerve from the cervical plexus. 



Summary of the Facial Nerve. — The facial nerve, after its emergence from 

 the aqueduct of Fallopius through the stylo-mastoid foramen, supplies the 

 following muscles : ( i ) the extrinsic and intrinsic muscles of the auricle ; 

 (2) the posterior belly of the digastric and the stylo-hyoid ; (3) the muscles 

 of the scalp, namely, the occipitalis and the frontalis ; (4) the superficial 



