60 ANATOMY OF THE DOMESTIC FOWL 



which gives an extensive surface for muscular attachments. The 

 sternal muscles overlie this portion. 





FIG. 13. Muscles of the fore extremity. Inside view, i, Lateral external 

 process of sternum. 2, Lateral internal process of same. 3, Ligament of the 

 external notch. 4, Ligament of the internal notch. 5, Pectoralis major. 50, 

 Its fan-shaped expansion at shoulder-joint laid back. 6, Pectoralis tertius. 7, 

 The coracoid. 8, Biceps. 8a, Its long head. 8b, Its short head. 9, Pectoralis 

 secundus. 10, Rectus abdominis. n, Teres et infraspinatus. 12, Deltoid. 

 13, Capsular ligament. 14, Teres minor. 15, Coraco-brachialis. 16, Serratus 

 magnus anticus. 17, Extensor metacarpi radialis longior. i8,'Pronator brevis. 

 19, Flexor carpi ulnaris. 20, Flexor carpi ulnaris brevior. 21, Flexor digitorum 

 profundus. 22, Extensor indicis longus. 23, Extensor ossis metacarpi pollicis. 

 24, Humerus. 25, Shoulder. 26, Elbow. 27, Carpus. 28, Section through 

 vertebra. 29, Keel of sternum. 28a, Flexor brevis pollicis. 290, Extensor 

 proprius pollicis. 30, Flexor minimi digiti brevis. 31, Interosseous palmaris. 

 32, Interosseous palmaris. 



The sternum is connected by a fibrous mass with the inferior 

 portion of the clavicle, or hypocledium (Fig. 57), the damculo sternal 

 ligament. 



The inferior narrow elongated end of the coracoid forms with the 

 sternum a true articulation, which is provided with a capsular 



