Cranial Nerves. 135 



479. The Facial Nerve within the Petrous Bone. 



After the facial nerve has left the stylo-mastoid foramen, it gives 

 off the following branches : 



a) The posterior auricular nerve, Nervus auricular is poste- 

 rior profundus, which, inosculating with the auricular branch of the 

 pneumogastric and the small occipital nerve, supplies the M. retrahens 

 auriculae, the M. occipitalis, and the posterior part of the occipito-frontalis 

 muscle ; 



b) The stylo- hyoid, N. stylo-liyoidcus , and the posterior 

 digastric, N. digastricus posterior ; 



c) Communicating branches to the auriculo-temporal branch of the 

 inferior maxillary nerve. 



The facial nerve then pierces the parotid gland, which, at the 

 same time it supplies with very small filaments. Behind- the ramus of 

 the lower jaw it . terminates by dividing into two parts, temporo- 

 facial and cervico-facial; these give off 8 10 branches, which, 

 by communication, form the Pes anserinus major. The following groups 

 are then formed : 



a) Temporal branches, Sami temporo-frontales ; these commu- 

 nicate with the auriculo-temporal nerve, the deep temporal nerves, the 

 frontal and the lachrymal nerves, and supply the MM. attrahens and levator 

 auriculae, the M. temporalis, the M. orbicularis palpebranun and the M. cor- 

 rugator supercilii. 



b) Malar branches, Kami zyyomatici ; these join with the 

 N. zyyomaticus malae, the lachrymal and supraorbital nerves, and supply 

 the M. zyyomaticus, M. orbicularis and M. levator labii superioris et alae nasi. 



