456 



THE MUSCLES AND FASCIA 



5. Posterior Scapular Region. 

 Supraspinatus. Teres minor. 



Infraspinatus. 



Teres major. 



6. Anterior Humeral Region. 



Coracobrachialis. Biceps. 



Brachialis anticus. 



7. Posterior Humeral Region. 

 Triceps. Subanconeus. 



III. OF THE FOREARM. 



8. Anterior Radioulnar Region. 



Pronator teres. 



Flexor carpi radialis. 



Palmaris longus. 



Flexor carpi ulnaris. 



Flexor sublimis digitorum. 

 f Flexor profundus digitorum. 

 | Flexor longus pollicis. 

 [ Pronator quadratus. 



&3 



9. Radial Region. 



Brachioradialis. 



Extensor carpi radialis longior. 



Extensor carpi radialis brevior. 



5 

 "8 



CG ' 



t-i Oj 



o> SL 

 ft. 5* 



10. Posterior Radioulnar Region. 



Extensor communis digitorum. 



Extensor minimi digiti. 

 Extensor carpi ulnaris. 



Anconeus. 



Supinator [brevis]. 



Extensor ossis metacarpi pollicis. 

 I Extensor brevis pollicis. 

 I Extensor longus pollicis. 

 I Extensor indicis. 



IV. OF THE HAND. 



11. Radial Region. 



Abductor pollicis. 

 Opponens pollicis. 

 Flexor brevis pollicis. 

 Adductor obliquus pollicis. 

 Adductor transversus pollicis. 



12. Ulnar Region. 



Palmaris brevis. 

 Abductor minimi digiti. 

 Flexor brevis minimi digiti. 

 Opponens minimi digiti. 



13. Middle Palmar Region. 



Lumbricales. 

 Interossei palmares. 

 Interossei dorsales. 



Dissection of Pectoral Region and Axilla (Fig. 346). The arm being drawn away from 

 the side nearly at right angles with the trunk and rotated outward, make a vertical incision 

 through the integument in the median line of the thorax, from the upper to the lower part of the 

 sternum; a second incision along the lower border of the Pectoral muscle, from the ensiform 

 cartilage to the inner side of the axilla; a third, from the sternum along the clavicle, as far as its 

 centre; and a fourth, from the middle of the clavicle obliquely downward, along the interspace 

 between the Pectoral and Deltoid muscles, as low as the fold of the axilla. The flap of integu- 

 ment is then to be dissected off in the direction indicated in the figure, but not entirely removed, 

 as it should be replaced on completing the dissection. If a transverse incision is now made 

 from the lower end of the sternum to the side of the thorax, as far as the posterior fold of the 

 axilla, and the integument reflected outward, the axillary space will be more completely exposed. 



I. THE MUSCLES AND FASCIAE OF THE THORACIC REGION. 

 1. The Anterior Thoracic Region. 



Pectoralis major. 

 [Sternalis.] 



Pectoralis minor. 

 Subclavius. 



The superficial fascia of the thoracic region is a loose cellulofibrous layer en- 

 closing masses of fat in its spaces. It is continuous with the superficial fascia of 

 the neck and upper extremity above, and with that of the abdomen below. Oppo- 



