376 THE MUSCLES AND FASCIAE 







MUSCLES AND FASCIAE OF THE UPPER EXTREMITY. 



The Muscles of the Upper Extremity are divisible into groups, corresponding 

 with the different regions of the limb. 



I. OF THE THORACIC REGION. 

 1. Anterior Thoracic Region. 



Pectoralis major. Pectoralis minor. 

 Subclavius. 



2. Lateral Thoracic Region. 

 Serratus magnus. 



II. OF THE SHOULDER AND ARM. 



3. Acromial Region. 

 Deltoid. 



4. Anterior Scapular Region. 



Subscapula-ris. 



5. Posterior Scapular Region. 



Supraspinatus. Teres minor. 



Infraspinatus. Teres major. 



6. Anterior Humeral Region. 



Coraco-brachialis. Biceps. 



Brachialis anticus. 



7. Posterior Humeral Region. 

 Triceps. Subanconeus. 



III. OF THE FOREARM. 



8. Anterior Radio- Ulnar Region. 

 ~ ( Pronator radii teres. 

 '3 -~ Flexor carpi radialis. 

 -(< Palmaris longus. 



O ct | o 



g-i-3 | Flexor carpi ulnaris. 

 #2 (^Flexor sublimis digitorum. 



d, -~ ( Flexor profundus digitorum. 



%> ^ <( Flexor longus pollicis. 

 ^ ^ (^ Pronator quadratus. 



9. Radial Region. 



Supinator longus. 



Extensor carpi radialis longior. 



Extensor carpi radialis brevior. 



10. 



rt 



I 



OS 



Posterior Radio- Ulnar Region. 



T Extensor communis digitorum. 

 I Extensor minimi digiti. 

 ] Extensor carpi ulnaris. 

 I Anconeus. 



f Supinator brevis. 



^ ^ | Extensor ossis metacarpi pollicis. 

 t^ <( Extensor brevis pollicis. 

 " i_5 Extensor longus pollicis. 



(^Extensor indicis. 



IV. OF THE HAND. 



11. Radial Region. 



Abductor pollicis. 



Flexor ossis metacarpi pollicis 



(Opponens pollicis). 

 Flexor brevis pollicis. 

 Adductor obliquus pollicis. 

 Adductor transversus pollicis. 



12. Ulnar Region. 



Palmaris brevis. 

 Abductor minimi digiti. 

 Flexor brevis minimi digiti. 

 Flexor ossis metacarpi minimi digiti 

 (Opponens minimi digiti). 



13. Middle Palmar Region. 



Lumbricales. 

 Interossei palmares. 

 Interossei dorsales. 



Dissection of Pectoral Region and Axilla (Fig. 228). The arm being drawn away 

 from the side nearly at right angles with the trunk and rotated outward, make a vertical in- 

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

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

 form 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 armpit. The flap 

 of integument 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 01 the sternum to the side of the chest, as far as the posterior fold of 

 the armpit, and the integument reflected outward, the axillary space will be more completely 

 exposed. 



