!68 PRACTICAL ANATOMY. 



(5) loss of motion in the adductor pollicis and in the ulnar head of the flexor 

 brevis pollicis ; (6) loss of sensation in all the intermetacarpal joints. 



Give svmptoms in paralysis of the median nerve. 



(i) Loss of sensation in the thumb, index, middle, and half the ring finger, 

 on the palmar surface, and about the roots of the nails of the dorsal surface ; 

 (2) loss of motion in all the muscles of the anterior part of the forearm, except 

 the muscle and a half supplied by the ulnar nerve, as previously explained ; (3) 

 loss of motion in the two lumbrical muscles on the radial side of the hand, and 

 loss of motion in the outer head of the flexor brevis pollicis, in the opponens 

 pollicis, in the abductor pollicis. 



Describe the blood-supply of the hand. 



The ulnar and radial arteries terminate in the superficial and deep palmar 

 arches respectively. These arches give off branches to the hand and fingers. 

 (Fig. 116.) 



Describe the superficial pa/mar arch. 



This arch is a continuation of the ulnar artery across the hand. It anasto- 

 moses with the superficialis volae a branch of the radial artery to complete the 

 arch. The arch may be completed by anastomosis with the radialis indicis or 

 princeps pollicis, both branches of the radial artery also. The superficial arch 

 gives off four branches called first, second, third, and fourth palmar digital 

 branches when enumerated toward the thumb. The first palmar digital artery 

 supplies the ulnar side of the little finger ; each of the three others divides into two 

 collateral digital branches. The radial side of the index finger is supplied by the 

 radialis indicis ; the thumb by the princeps pollicis. The digital branches from 

 the superficial arch are joined, opposite the clefts of the fingers, by (i) the palmar 

 interosseous, branches of the deep palmar arch ; (2) by the inferior perforating 

 arteries from the dorsum of the hand. 



Describe the deep palmar arch. 



This arch is a continuation of the radial artery across the hand. It anasto- 

 moses with the deep branch of the ulnar artery. (Fig. 116.) It begins at the 

 first interosseous space, and rests on the metacarpal bones close to their carpal 

 ends. The arch is attended by the deep branch of the ulnar nerve as described 

 on page 164. The deep arch gives off three palmar interosseous arteries, which 

 inosculate with the digital branches of the superficial arch at the clefts of the 

 fingers. All the digital branches are attended by collateral nerve branches of the 

 median and ulnar nerves. 



THE FOREARM. 



In this region you must review the osteology of the radius and ulna, and 

 become familiar with eminences, depressions, that are associated with the origin, 

 insertion, and location of muscles. You must be able to name all the articular 

 surfaces, and give the rule of occupancy for their n^mes. You must name tech- 

 nically all articulations, and give the rule for writing compound words. 



The Radius (Fig. 124). 



Name the important points on this bone concerned in practical anatomy. 



The radial head and its concave and convex articular surfaces. 



The bicipital tuberosity for the tendon of the biceps and for a bursa. 



The ulnar articular surface for the lesser sigmoid cavity of the ulna. 



The humeral articular surface for articulation with the capitellum. 



