THE LIMBS. 



309 



(2) The levator claviculae (omo-trachelian) is a muscle which 

 passes from the upper transverse cervical processes to the outer 

 end of the clavicle or acromion process. It is well developed in 

 climbing primates. It is not a common muscle in man. It can 

 be recognised during life in the posterior triangle of the neck. 



v .; — scapula 



long head triceps 



teres major 



latis. dorsi 

 ^■vestigial /at condyl. of man 

 'at.-condyl. of primates 

 inner head triceps 



-internal intermusc. sept, 

 -triceps 

 ^internal condyle. 

 - olecranon 



Fig. 249. — Latissimo-condyloideus Muscle. 



(3) The latissimo-condyloideus (dorso-epitrochlearis), a climbing 

 muscle, is always represented in man, commonly by a fibrous 

 bundle between the tendon of the latissimus dorsi and the long 

 head of the triceps (Fig. 249). It may be occasionally muscular. 

 In apes it passes from the latissimus dorsi at the axilla to the 

 inner aspect of the elbow and arm, which it retracts in climbing. 

 It belongs to the same sheet as the coraco-brachialis. The 

 ligament of Struthers — a strip of fibrous tissue over the internal 

 intermuscular septum, above the internal condyle — represents 

 part of the tendon of this muscle. The muscular slips occa- 

 sionally found crossing the brachial or axillary artery from the 

 latissimus dorsi to the coraco-brachialis or biceps are derivates 

 of this muscle. Other slips found crossing the floor of the axilla, 

 between the adjacent borders of the pectoralis major and 

 latissimus dorsi, are parts of the muscular sheet out of which 

 these two muscles are developed. 



(4) The pectoralis externus arises from the 4-5-6 ribs and 



