322 



A MANUAL OF ANATOMY 



Insertion. — The inner lip of the bicipital groove of the humerus 

 for 2 inches over about its lower two-thirds. 



Nerve-supply. — The lower subscapular nerve, which is a branch of 

 the posterior cord of the brachial plexus, its fibres being derived 

 from the fifth and sixth cervical. 



The direction of the muscle is outwards. 



- Infraspinatus 



Teres Minor 



Teres Major 



Teres Branch of Dorsalis' 

 ScapuljE Artery 

 Dorsalis Scapulae Artery in^ 

 Triangular Space 

 Nerve to Teres Minor, with-' 

 Gangliform Enlargement 



- Posterior Circumflex Art 



and Circumflex Nerve 



Quadrangular Space 



-Pectoraiis M< 



" - - Deltoid 



Fig. i8o. — Dissection of the Scapular and Upper Brachial Regions 



FROM Behind. 



(The Deltoid has been turned down, and the Triangular and Quadrangular 

 Muscular Spaces, with their contents, are shown.) 



A ction.— The muscle adducts the arm. When the arm is abducted 

 it acts as an internal rotator. 



The latissimus dorsi winds round the lower border of the muscle, 

 and is subsequently placed in front of it. The two tendons are 

 3t first closely connected by their lower borders, but are after- 



