96 LABORATORY MANUAL OF HUMAN ANATOMY 



(db) Volar interosseous nerve of forearm (A r . interosseus anti- 



brachii volaris) (0. T. anterior interosseous). 

 (dba) Rami musculares, to be studied a little further on. 



(dc) Palmar ramus (ramus palmaris N. mediani) (0. T. median 



palmar cutaneous), already examined (vide supra). 



Deep Structures on Volar Surface of Forearm. 



The remaining structures on the volar surface are now to be 

 dissected out and carefully cleaned. 



Muscles. 



(a) Deep flexor muscle of fingers (M. flexor digitorum profundus). 



(b) Long flexor muscle of thumb (M. flexor pollicis longus). 



(c) Quadrate (or square) pronator muscle (M. pronator quadratus). 



Blood-vessels. 



(a) Volar interosseous artery (A. interossea volaris) (0. T. anterior 



interosseous). 



(aa) Median artery (A. mediana). 



(ab) Muscular rami (rami musculares). 



(b) Volar interosseous veins (Vv. interosseae volares). (Cf. Toldt, 



Fig. 1063.) 



Volar interosseous nerve (N. interosseus [antibrachii] volaris) (0. T. 



anterior interosseous). 



(a) Muscular rami (rami musculares) to the M. flexor digitorum pro- 

 fundus (lateral or radial part) and M. pronator quadratus. 



WRIST AND PALM (CARPUS ET VOL A MANUS 



[PALM A]). 



Study the surface anatomy first, noting the thenar and hy- 

 pothenar eminences. Palpate the bony prominences in the front 

 of the wrist. To what is each due ? Observe the three prominent 

 furrows in the thick skin of the palm. Note also the transverse 

 sulci on the palmar surfaces of the digits. In what relation do 

 these stand to the metacarpophalangeal articulations and the 

 finger- joints? 



To reflect the skin make (1) a vertical incision along the 

 middle line of the vola manus and (2) a transverse incision near 

 the metacarpophalangeal junction from the margo radialis to 

 the margo ulnaris of the hand. Reflect the flaps of skin ulnar- 

 ward and radialward respectively, proceeding with caution. Do 

 not reflect the ulnar flap quite to the ulnar margin of the hand 

 until the insertion of the M. palmaris brevis into it has been 

 made out. 



