342 



COMMON CAROTID ARTERIES. 



the omo-hyoid muscle. From this point upwards to its bifurcation, the 

 vessel is covered by the sterno-mastoid, by the platysma and fascia, and 

 by the common integument ; and lies in a triangular space bounded by the 

 sterno-mastoid, the omo-hyoid, and the digastric muscles. 



Fig. 254. VIEW OP THE RIGHT COMMON CAROTID AND SUBCLAVIAN ARTERIES, WITH 

 THE ORIGIN OP THEIR BRANCHES AND THEIR RELATIONS (from R. Quain). ^ 



The sterno-mastoid, sterno-thyroid, sterno-hyoid, and omo-hyoid muscles have been 

 removed, the trapezius has been detached from the outer part of the clavicle and turned 

 backwards, and the inner pai't of the clavicle has been removed : a, parotid gland near 

 the place where the duct of Stenson leaves it ; b, angle of the jaw and masseter muscle ; c, 

 submaxillary gland, enclosed between the digastric and stylo-hyoid muscles ; rf, divided 

 upper part of the sterno-mastoid muscle ; e, front of the hyoid bone ; /, thyroid cartilage ; 

 g, isthmus of the thyroid gland ; h, the trachea above the inter-clavicular notch of the 

 sternum ; i, i' } the sawn ends of the clavicle, the portion between them having been 

 removed ; k, the first rib, below which is seen the divided edge of the great pectoral 

 muscle, and beside it the subclavius ; /, front of the sternum ; TO, scalenus medius ; w, 

 levator anguli scapulas ; o, deep surface of the trapezius, which is turned aside; p, on the 



