1290 



SURFACE ANATOMY AND SURFACE MARKINC 



of the muscle appears as an oblique elevation with a thick, rounded, anterior border, 

 best marked in its lower part. The sternal heads of the two muscles are separated 

 by a V-shaped depression, in which are the Sternohyoideus and Sternothyreoideus. 



Above the hyoid bone, near the middle line, the anterior belly of the Digastricus 

 produces a slight convexity. 



The anterior border of the Trapezius presents as a faint ridge running from the 

 superior nuchal line, downward and forward to the junction of the intermediate 

 and lateral thirds of the clavicle. Between the Sternocleidomastoideus and the 

 Trapezius is the posterior triangle of the neck, the lower part of which appears as 

 a shallow concavity the supraclavicular fossa. In this fossa, the inferior belly of 

 the Omohyoideus, when in action, presents as a rounded cord-like elevation a little 

 above, and almost parallel to, the clavicle. 





Anterior belly of Digasfricw 

 Myloliyoideus 



Hyoid bone 

 Thyroid cartilage 

 Cricoid cartilage 

 Sternccleidomasfoideus 

 Suprucla vicular fossa, 

 Trapezius 



Clavicle 



Clavicular head ) of Sternocleido* 

 Sternal head ) mastoideus 



FIG. 1195. Front view of neck. 



Arteries. The positions of several of the larger arteries can be ascertained 

 from their pulsations. 



The subclavian artery can be felt by making pressure downward, backward, and 

 medialward behind the clavicular head of the Sternocleidomastoideus ; its transverse 

 cervical branch may be detected parallel to, and about a finger's breadth above, 

 the clavicle. The common and external carotid arteries can be recognized immediately 

 beneath the anterior edge of the Sternocleidomastoideus. The external maxillary 

 artery can be traced over the border of the mandible just in front of the anterior 

 border of the Masseter, then about 1 cm. lateral to the angle of the mouth, and 

 finally as it runs up the side of the nose. The pulsation of the occipital artery 

 can be distinguished about 3 or 4 cm. lateral to the external occipital protuberance; 

 that of the posterior auricular in the groove between the mastoid process and the 

 auricula. The course of the superficial temporal artery can be readily followed 

 across the posterior end of the zygomatic arch to a point about 3 to 5 cm. above 

 this, where it divides into its frontal and parietal branches; the pulsation of the 

 frontal branch is frequently visible on the side of the forehead. The supraorbital 

 artery can usually be detected immediately above the supraorbital notch or foramen. 



