98 LABORATORY MANUAL OF HUMAN ANATOMY 



spond? Note the distribution of the longitudinal and transverse 

 fibres which constitute it. Examine carefully 

 (d) Fasciculi transversi (0. T. transverse superficial ligament). 



Between each two digital slips of the aponeurosis palmaris, 

 note the vessels and nerves. Cut through the fasciculi transversi 

 in order to expose them better. Observe the septa passing into 

 the depth from the margins of (b}. What three compartments 

 are thus formed and what do they contain ? 



Superficial Volar Arch (Arcus volaris superficialis) (O. T. Superficial 

 Palmar Arch) and Ulnar Artery. 



Cut through the narrow proximal part of the aponeurosis 

 palmaris, reflect it distalward, and then remove it entirely. Be- 

 move the ligamentum carpi volare and dissect out the ulnar 

 vessels and ramus volaris manus N. ulnaris in the palm. Dissect 

 out also the N. medianus and its branches; avoid injury to the 

 muscular rami near the distal margin of the ligamentum carpi 

 transversum. To follow out the digital vessels and nerves, make 

 an incision along the middle line of the volar surface of each 

 digit and reflect the skin ulnarward and radialward. 



How is the superficial volar arch formed! Study the ulnar 

 artery and the superficial volar ramus of the radial artery. 

 Where does the ulnar artery give off its deep volar ramus ! On 

 the skin of your own palm draw a line with a colored pencil cor- 

 responding to the position of the arcus volaris superficialis. 



Branches : 



(a) Common volar digital arteries (Aa. digitales volares communes) 



(0. T. palmar digital arteries). 



(aa) Volar digital arteries proper (Aa. digitales volares pro- 

 priae) (0. T. collateral digital arteries). 



Note the point where the Aa. digitales volares communes 

 receive the Aa. metacarpeae volares II.-IV. from the deep volar 

 arch. Observe the relations of the digital arteries to the accom- 

 panying nerves ; the relations of the proper digital differ from 

 those of the common digital arteries. 



Median Nerve in Palm (N. medianus). (Fig. 35.) 



How does this nerve enter the palm? Note its relations to the 

 ligamentum carpi transversum and to the mucous sheath of the 

 flexor tendons. Study the following branches : 



(a) Muscular rami (rami musculares) to M. abductor pollicis brevis, M. 

 flexor pollicis brevis (caput superficialis), and M. opponens pollicis. 



