62 ANATOMY IX A NUTSHELL. 



The internal lateral ligament is continuous with the anterior and posterior 

 ligaments; it is triangular in shape, with the apex above, attached to the in- 

 ternal condyle of the humerus; the anterior angle below is attached to the inner 

 edge <>t' the coronoid process. Its posterior angle below is attached to the inner 

 edge of the olecranon process. There are filters running from the apex to eaeh 

 inferior angle, also fibers connecting the inferior angles. The Flexor sublimits 

 digitorum is attached to this ligament. 



The posterior ligament is continuous with the two lateral ligaments; it 

 is attached above to the margin of the olecranon fossa and below to the ole- 

 cranon process ami orbicular ligament. 



The external lateral ligament is attached above to the depression below the 

 external condyle of the humerus; below, it is attached to the orbicular liga- 

 ment, head of the radius and the outer side of the ulna: there are two muscles 

 attached to this ligament, the Extensor carpi radialis brevior and Supinator 

 brevis. These four ligaments make a capsular ligament. Synovial mem- 

 brane lines that portion of the ligaments and bones which make the joint and 

 sends a part into the superior radio-ulnar articulation. 



The ligamentous muscles of the elbow-joint are the Biceps, Triceps. Bra- 

 chials anticus and all the muscles in the forearm except, the Flexor profundus 

 digitorum, Flexor longus pollicis. Pronator quadratus and Extensor ossis met- 

 acarpi pollicis. Extensor brevis pollicis. Extensor longus pollicis and Extensor 

 indicis. 



Nerve supply.— Musculo-spiral, musculo-cutaneous, median and ulnar 

 nerve-. 



Blood supply. — Anterior and posterior ulnar recurrent, radial recurrent. 

 interosseous recurrent, anastomatica magna, superior profunda and inferior 

 profunda. 



LESSON XIV. 



ARTERIES. 



Axillary artery. The subclavian artery passes under the clavicle and over 

 the firsl rib, from the lower surface of which it is called the Axillary artery until 

 it leaves the axillary space at the lower border of the tendon of the Teres major, 

 then it take.- the name Brachial artery. This artery is crossed by the Pector- 

 alis minor muscle which divides the artery into three (tarts; the pari above it is 

 called the firsl pari, the part behind it is called the second part ami the part 

 below it is called the third part (Plate XVI.) 



Branches. This artery has seven branches, (Plate XVII) two from the 

 first portion, the superior thoracic and the acromial thoracic; two from the sec- 

 ond portion, the alar thoracic ami the long thoracic or external mammary, and 

 three from the third portion, the subscapular, anterior circumflex, and poster- 

 ior circumflex. 



The superior thoracic arises so close to the upper border of the axillary 

 artery that it is sometimes given as a branch of the subclavian. It may come 

 from the acromial thoracic axis. It i> between the Pectoralis major and minor. 





