VARIETIES OF THE COMMON CAROTID ARTERY. 



5o9 



of bifurcation of the innominate artery. A change from the usual position on a 

 level with the upper border of the clavicle was found by R. Quain in the propor- 



Fix. 248. 



Fig. 248. — Dissection op the Riqht Side op the Neck to show the Carotid and 

 Subclavian Arteries, &c. (from R. Quain). -^ 



a, angle of the jaw and masseter muscle ; b, parotid gland ; + , the posterior belly of 

 the digastric muscle ; c, submaxillary gland ; d, mylohyoid muscle below the anterior 

 belly of the digastric muscle ; c, upper belly of the omohyoid muscle ; e', lower belly ; 

 f, sterno-hyoid muscle ; (/, sterno-thyroid ; 1, upon the sterno-mastoid muscle, points by 

 a line to the upper part of the common carotid artery ; 2, upon the scalenus anticus 

 muscle, points to the third part of subclavian artery ; 3, upon the scalenus medius, points 

 to the superficial transverse cervical artery crossing the axillary nerves ; 4, points to the 

 posterior scapular artery, passing under the levator scapula; muscle ; 5, placed upon the 

 clavicle, points to the suprascapular artery ; 6, external carotid artery ; 6', internal 

 carotid artery ; 7, upon the thyro-hyoid muscle, points to the superior thyroid artery 

 giving superiorly its hyoid branch ; 8, is placed upon the hyo-glossus muscle within the 

 arch of the lingual artery ; 9, placed on the stylo-hyoid muscle, indicates the facial 

 artery ; 10, origin of the occipital artery, from the root of which the small sterno-mastoid 

 artery is given off ; betweem the occipital and the facial arteries, -f , upon the posterior 

 belly of the digastric muscle, points to the continuation of the external carotid artery 

 before entering the parotid gland. 



