210 



MUSCLES OF THE UPPEK LIMB. 



Fig. 176. 



completely fills the 

 and its fibres converge be- 

 neath the acromion to a 

 tendon, which adheres to the 

 capsule of the shoulder- joint, 

 and is inserted into the 

 upper of the three facets on 

 the great tuberosity of the 

 humerus. 



Fig. 176. SUPERFICIAL MUS- 

 CLES OF THE SHOULDER AND 

 UPPER LIMB, FROM BEFORE. % 



1, pectoralis major; 1', its 

 clavicular portion ; 2, deltoid ; 

 3, biceps brachii ; 3', its tendon 

 of insertion ; 3", its aponeu- 

 rotic slip ; 4, brachialis anticus ; 

 4', its inner and lower portion ; 

 5, inner head of the triceps ; 5', 

 lower part of the same, seen 

 rising from behind the inter- 

 muscular septum. The expla- 

 nation of the remaining references 

 will be found in the description of 

 fig. 179. 



The infraspinatus muscle, 

 occupying the greater part 

 of the infraspinal fossa, 

 arises from the under surface 

 of the spine and from the 

 whole surface of the blade 

 of the scapula below the 

 spine, except those parts at 

 the lower angle and along 

 the external border, to which 

 the teres muscles are at- 

 tached. The fibres converge 

 to a tendon, which is con- 

 cealed at first within the sub- 

 stance of the muscle, and is 

 inserted into the middle 

 facet of the great tuberosity 

 of the humerus. 



The supraspinatus muscle is 

 covered by the trapezius and the 

 acromion process. 



The infraspinatus muscle is 

 bound down by an aponeurosis, 

 which superiorly and externally 

 divides so as to enclose the 

 deltoid muscle. It is covered 

 by the deltoid at its upper and 

 outer part, and by the trapezius 

 at its upper and inner part, by 



