52 HUMAN ANATOMY. 



The head, forming nearly a sphere,, projecting upward, back- 

 ward, and inward, articulating with the glenoid cavity ; 



The anatomical neck, immediately beneath, is slightly 

 grooved for the attachment of the capsular ligament; 



Greater tuberosity, external to the head and lesser tuberosity, 

 with three facets from before backward for attachment of supra- 

 spinatus, infra-spinatus, and teres minor muscles; 



Lesser tuberosity, smaller but more prominent than greater, 

 is anterior to head, for the subscapular muscle ; 



Bicipital groove, passes downward and inward between the 

 two tuberosities and lodges the long tendon of biceps; 



The anterior bicipital ridge, bounds the groove in front and 

 receives insertion of pectoralis major muscle; 



The posterior bicipital ridge, receives the latissimus dorsi 

 and teres major; 



The surgical neck, including the head, neck, and both tuber- 

 osities ; 



A rough impression near the centre of the inner border for 

 the coraco-brachialis muscle ; 



Nutrient canal, below and directed toward the lower ex- 

 tremity. 



The lower extremity presents from within outward the fol- 

 lowing : 



Internal condyloid ridge, extending upward from the con- 

 dyle; 



Internal condyle, more prominent than external, gives ori- 

 gin to the flexors and pronator radii teres ; 



Epitroclilea, an eminence separating the trochlea from the 

 internal condyle ; 



Trochlea, a pulley-like articulating surface for greater sig- 

 moid cavity of ulna ; 



Coronoid fossa, a small depression bounding the trochlea in 

 front, and receiving the coronoid of the ulna in flexion; 



Olecranon fossa, a larger depression behind, and receiving 

 the olecranon process of ulna in extension; 



Supra-trochlear foramen, sometimes formed by perforation 

 of one fossa into the other ; 



Radial head, or capitellum, a smooth, rounded eminence ar- 

 ticulating with cup-like depression on head of radius ; 



External condyle, less prominent, gives origin to the ex- 

 tensors and supinators; 



External condyloid ridge, extending upward on the shaft 

 from the condyle. 



It articulates with three bones scapula, radius, and ulna. 



