MUSCLES OF THE RIGHT SUPERIOR LIMB 



47 



muscles and their importance in interpreting the major motions 

 and locomotion. The more superficial muscles are dissected 

 first, then transected and the two ends reflected before an 

 attempt is made to dissect out the next underlying muscle. 

 Thus, if the student will intelligently follow the consecutive 

 arrangement for these dissections he will save time. 



Fig. i8. — Superficial muscles of shoulder and arm. AD, acromiodeltoid (13); 

 AT, anterior trapezius (la); B, biceps brachii (20); BC, basioclavicularis (4); 

 C, costal attachments of external oblique (51); CD, clavodeltoid; CM, cleido- 

 mastoid; E, external auditory meatus; ECRL, extensor carpi radialis longus (27); 

 EDC, extensor digitorum communis; ET, ectotriceps (caput laterale, 22a); 

 FCU, flexor carpi ulnaris (29); GD, grooved director in position for transecting- 

 AT (la) ; I A, interscapular aponeurosis (often more extensive than is shown here) ; 

 L, levator scapulae ventralis (3); LDF, lumbodorsal fascia; M, masseter muscle 

 (63); MT, meditriceps (caput longum); PM, pectoralis minor; PT, posterior 

 trapezius; S, serratus magnus (10); SM, sternomastoid (7). 



A. MUSCLES WHICH ATTACH LIMB TO BODY 



(Nos. i-ii, Fig. 18) 



I. Trapezius muscles (Fig. i8): Arise continuously from 

 the occiput along the spinous processes and lumbodorsal fascia ; 

 to spine and metacromion of scapula. This muscle is sub- 



