THE CIRCULATORY OR VASCULAR SYSTEM IOI 



In its distribution this artery sometimes terminates at 

 the angle of the mouth or nose, at the ala, and its inoscu- 

 lations are numerous. 



The occipital artery, one of the branches of the external 

 carotid, arises opposite the styloid process of the temporal 

 bone, and ascends beneath the parotid gland and under 



FlG. 51. Facial and temporal arteries: Ce, External carotid; tsu, su- 

 perior thyroid ; Is, superior laryngeal ; ct, cricothyroid ; Ay, hyoid branch 

 of lingual ; dl, dorsal of tongue ; s, sublingual ; me, facial ; smt, submental ; 

 a, angular; Ibi, inferior labial ; Ibs, coronary of upper lip ; su, artery of nasal 

 septum ; sc, sc', sternomastoids ; ap, posterior auricular ; st, stylomastoids ; 

 pda, ascending pharyngeal ; mi, internal maxillary ; tps, superficial tem- 

 poral ; tf, transverse facial ; tm, middle temporal ; z, external supra-orbital ; 

 /, frontal; so, supra- o rb i tal ; la, lacrimal ; , nasal; *, parotid branches of 

 'external carotid (after Henlc). 



the sternomastoid muscle, passing along to the occipital 

 groove in the mastoid portion of the temporal bone; it 

 then ascends and is distributed to the back part of the 

 head. It furnishes the following branches: muscular 

 (supplying the sternomastoid, digastric, stylohyoid), 

 auricular, meningeal, and arteria princeps cervicis. 



