PRACTICAL DIRECTIONS. 439 



30. Extensor communis digitorum (p. 174, and Fig. 75, m). 



31. Extensor lateralis digitorum (p. 175, and Fig. 75, ). 



32. Extensor carpi ulnaris (p. 176, and Fig. 75, 0). 



33. Extensor indicis (p. 176, and Fig. 85, c). 



34. Pronator teres (p. 179, and Fig. 77, g). 



35. Flexor carpi radialis (p. 179, and Fig. 77, r). The tendon 

 of the flexor carpi radialis should not be traced to its insertion until 

 the deep muscles of the palm of the hand have been dissected. 



36. Abductor brevis pollicis (p. 184, and Fig. 77, w). 



37. Flexor carpi ulnaris (p. 180, and Fig. 77, /). 



38. Palmaris longus (p. 179. and Fig. 77, s). In dissecting this 

 muscle be careful not to injure the part of the flexor sublimis (Fig. 

 77, x) that rises from its surface (see flexor sublimis, p. 181). Cut 

 the palmaris proximad of the origin of the flexor sublimis and reflect 

 it. 



39. Flexor sublimis digitorum (p. 181 and Fig. 77, A-). Trace 

 one or two of the tendons through the sheaths on the ventral surfaces 

 of the first phalanges. Cut and reflect the radial portion. 



40. Flexor profundus digitorum (p. 181, and Fig. 77, #). After 

 recognizing the parts cut through the tendons of the first and fifth 

 parts and reflect them to determine their origin. Then cut through 

 the common tendon so as to reflect the other three parts together. 

 Trace one or two of the tendons to the distal end of the digit. 



41. The supinator (p. 177, and Fig. 85, b). 



42. The extensor brevis pollicis (p. 178, and Fig. 85, a). 



43. Pronator quadratus (p. 183, and Fig. 87, a). 



The insertion of the brachialis and clavobrachial (Fig. 87, c) 

 and of the biceps (Fig. 87, b) should now be examined. 



There remain to be dissected the small muscles of the palm of 

 the hand. If these have been injured on the side dissected, the 

 hand of the other side may be used. 



44. The lumbricals (p. 184, and Fig. 88, _/"). 



45. The flexor brevis pollicis (p. 184, and Fig. 89, a). 



46. The adductor pollicis (p. 185, and Fig. 89, b). 



47. The abductor digiti quinti (p. 185, and Fig. 89, *). 



48. The flexor brevis digiti quinti (p. 186, and Fig. 89, h). Cut 

 and reflect it. 



49. The opponens digiti quinti (p. 186, and Fig. 89, g}. Cut 

 and reflect it. 



50. The interossei (p. 185, and Fig. 89). 



IV. MUSCLES OF THE NECK AND THE DEEP MUSCLES OF THE HEAD. 



If the superficial muscles of the head have been dissected accord- 

 ing to the directions above given (p. 434), the skin of the head and 

 neck, and the external ear, will have been removed, and the speci- 

 men is ready for further study. The parotid and submaxillary glands 



