THE NERVES. 409 



m. triceps and the lig. intermusc. intern, under the skin to the 

 groove behind the condylus internus, between it and olecranon, 

 without giving off branches. Hence it passes between proc. 

 coronoid. of ulna and flexor carpi ulnaris [between the origins 

 of this muscle], and passes on the ulnar side of the anterior sur- 

 face of the fore-arm, and divides in its inferior third into a volar 

 and dorsal branch. At this point it lies under m. flex. carp, 

 ulnaris and digitor. super ficialis, above the profundus ; at first 

 over, then internal to art. ulnaris. Branches to m. flex, carpi 

 ulnar., digit, superflc. [profundus] ; one branch accompanies 

 art. ulnaris to the skin of the volar surface of the carpus, as it 

 perforates the fascia antibrachii. 



a. Ram. dorsalis manus, passes between flex, carpi ulnaris 

 and ulna,, supplies the skin on the ulnar border of the fore- 

 arm and divides on the carpus. 



a. Ram. sublimis supplies the back of the fifth and fourth 

 fingers on each side, that of the third finger on the ulnar 

 side, with one branch. 



b. Ram. profundus (small) winds round over the capitu- 

 lum ulna upon the back of the hand, where it anasto- 

 moses towards the radial side. 



b. Ram. volaris, the continuation of the trunk, passes on the 

 inner side of art. ulnaris under the tendon of flexor carpi, 

 and enters, between lig. carp. vol. commune and proprium, 

 passing close to the os pisiforme into the hollow of the hand, 

 and divides into : 



a. Ram. sublimis, supplies the ulnar side of the little fin- 

 ger on the palmar surface. 



b. Ram. medius, supplies the radial side of the little and 

 the ulnar side of the fourth (ring) finger. 



c. Ram. profundus, supplies the muscles of the little fin- 

 ger, forms a loop on the os pisiforme with the corre- 

 sponding branches of the former ; passes on the arcus 

 profundus arteriosus to the mm. inter ossei, adduct. pol- 

 lids [and the two lumbricales nearest the little finger.] 



6. N. medianus ; arises from the fifth cervical to the first dorsal 

 nerves, from the outer part of the plexus, often united with n. mus- 

 culo-cutan. ; surrounds art. axillaris ; passes downwards on the 

 outer side of art. brachialis, on the inner of m. biceps, afterwards 

 over the artery and to its inner side, through plica cubiti to the 

 forearm, without giving branches. Descends from the centre of 

 the bend of the elbow over art. ulnaris and behind m. pronator 

 teres [often perforating it], is then situated in the inferior half of 



