408 ANATOMY IX A NUTSHELL. 



(2) \i:\i; the stylo-mastoid foramex, (a) posterior auricular arises from 

 the seventh nerve just outside the stylo-mastoid foramen and passes between the 

 external auditory meatus and the mastoid process where it receives a branch 

 of the auricular branch of the vaults. It communicates with the small occipital 

 nerve and the mastoid branch of the great auricular. It now divides into an 

 auricular branch which supplies the Retrahens aurem and an occipital branch 

 which supplies the Occipitalis muscle, (b) the digastric branch may have its 

 origin by common trunk with the stylo-hyoid branch. It supplies the posterior 

 belly of the Digastric and after perforating that muscle joins the glossopharyn- 

 geal nerve, (c) stylo-hyoid branch enters the Stylo-hyoid muscle near its center 

 ami communicates with the sympathetic plexus on the external carotid artery. 

 :;> On the FACE,(a)it has the temporo-facial branch which passes through 

 the parotid gland over the external carotid artery and temporo-maxillary vein, 

 and as it passes over the condyle of the lower jaw it communicates with the 

 auriculo-temporal branch of the fifth nerve, it finally divides into three sets 

 of branches, first, temporal branch which crosses the zygoma of the temporal 

 bone and supplies the Attrahens aurem and Attolens aurem muscles and joins 

 with the temporal branch of the temporo-malar of the fifth ami the auriculo- 

 temporal also of the fifth. It supplies the Orbicularis palpebrarum, Corrugator 

 supercilii, and the Frontalis muscles, and joins the supraorbital and lachrymal 

 blanches of the ophthalmic division of the fifth; second, the malar branches pass 

 to the outer portion of the orbit where a few fibers pass to the Orbicularis pal- 

 pebrarum arid join branches from the lachrymal nerve, and the others supply 

 the lower eye lid and join the malar branch of the superior maxillary; third, the 

 infraorbital passes to the parts between the mouth and the orbit and supplies 

 the superficial facial muscles and the Pyramidalis nasi ami joins with the in- 

 fratrochlear and nasal branches of the ophthalmic at the inner angle of the orbit. 

 Other branches pass under the Zygomatici and the Levator labii superioris, 

 supplying both of these muscles as well as the Levator anguli oris. They form 

 an infraorbital plexus with the infraorbital branch of the superior maxillary and 

 buccal branches of the cervical facial nerves. These branches supply the Leva- 

 tor labii superioris alanine nasi and the muscles of the nose, (b) The cervical 

 facial branch passes forward through the parotid gland across the external 

 carotid artery and receives branches from the great auricular. It divides op- 

 posite the angle of the lower jaw into three sets of branches, first, buccal which 

 crosses the Masseter muscle to supply the Buccinator and the Orbicularis oris. 

 These buccal branches join the infraorbital branches of the temporo-facial and 

 the buccal branches of the inferior maxillary; second, the supramaxillary (man- 

 dibular) branches pas> under the Platysma myoides and Depressor anguli oris 

 to supply the muscle of the chin and lower lip and join the mental branch of the 

 inferior dental of the fifth: third, the inframaxillary (cervical) branches pass 

 under the Platysma myoides and supply it. One branch descends vertically 

 to join the superficial cervical of the cervical plexus. 



The eighth nerve will be given with the anatomy of the ear. 



