446 



FACIAL NERVE. 

 Fig. 146.* 



The Tympanic branch is a small filament distributed to the stapedius 

 muscle. 



The Chorda tympani quits the facial just before that nerve emerges 

 from the stylo-mastoid foramen, and ascends by a distinct canal to the 

 upper part of the posterior wall of the tympanum, where it enters 



* The distribution of the facial nerve and the branches of the cervical plexus. 

 1. The facial nerve, escaping from the stvlo-mastoid foramen, and crossing the 

 ramus of the lower jaw ; the parotid gland has been removed in order to see the 

 nerve more distinctly. 2. The posterior auricular branch ; the digastric and 

 stylo-mastoid filaments are seen near the origin of this branch. 3. Temporal 

 branches, communicating with (4) the branches of the frontal nerve. 5. Facial 

 branches, communicating with (6) the infra-orbital nerve. 7. Facial branches, 

 communicating with (8) the mental nerve. 9. Cervico-facial branches, com- 

 municating with (10) the superficialis colli nerve, and forming a plexus (II) 

 over the submaxillary gland. The distribution of the branches of the facial in a 

 radiated direction over the side of the face and their looped communications 

 constitute the pes anserinus. 12. The auricularis magnus nerve, one of the 

 ascending branches of the cervical plexus. 13. The occipitalis minor, ascend- 

 ing along the posterior border of the sterno-mastoid muscle. 14. The super- 

 ficial and deep descending branches of the cervical plexus. 15. The spinal 

 accessory nerve, giving off a branch to the external surface of the trapezius 

 muscle. 16. The occipitalis major nerve, the posterior branch of the second 

 cervical nerve. 



