594 



HUMAN ANATOMY. 



Fig. 577- 



Brachialis anticti 



tendon of biceps. 



Extensor carpi 

 radialis longior 



Brachio-radialis' 



Superficial 

 flexors 

 (common 

 origin) 



head of 

 pronator radii 

 teres 



Insertion of pronator, 

 radii teres 



Flexor subliniia 

 digitorum 



Extensor carpi 

 ulnaris 



Flexor longus pollicis 



Tendon of flexor carpi 

 radialis, cut 



Abductor pollicis 



Flexor brevis pollicis 

 Adductor pollicis 



lexor 



profundus 

 digitorum 



Tendon of flexor 

 .carpi ulnaris 



Pisiform bone 



Abductor minimi 

 -digiti 



Tendon of 

 flexor longus 

 pollicis 



_FIexor brevis 

 minimi digiti 



Lumbricales 



Lumbricales 



Dissection of muscles of forearm and hand, anterior surface; most superficial 



muscles have been removed 



long, slender tendon that 

 passes in front of the an- 

 terior annular ligament 

 of the wrist, and is in- 

 serted into the palmar 

 fascia. 



Nerve-Supply. — 

 By the median nerve 

 from the sixth cervical 

 nerve. 



Action. — To tense 

 the palmar fascia and flex 

 the hand. 



Variations.— The pal- 

 maris longus is a very- vari- 

 able muscle. It is not in- 

 frequently absent, and may 

 present various modifica- 

 tions in its structure, being 

 sometimes entirely tendi- 

 nous, or entirely fleshy, or 

 tendinous above and fleshy 

 below. It is occasionally 

 double. 



4. Flexor Carpi Ul- 

 naris (Fig. 576). 



Attachments. — 



The flexor carpi ulnaris 

 arises from the medial 

 condyle of the humerus 

 in common with the 

 neighboring superficial 

 muscles, from the inter- 

 muscular septa and deep 

 fascia, and also from the 

 posterior surface of the 

 olecranon process, and 

 from the upper part of 

 the posterior border of 

 the ulna by means of an 

 aponeurosis common to 

 it and the flexor pro- 

 fundus digitorum and 

 the extensor carpi ul- 

 naris. It descends along 

 the ulnar border of the 

 forearm and is inserted 

 into the pisiform bone, 

 its tendon being contin- 

 ued on to be attached to 

 the hook of the unciform 

 and, ohen, to the base of 

 the fifth metacarpal bone. 



Nerve-Supply. — 

 By the ulnar nerve from 

 the eighth cervical and 

 first thoracic nerves. 



Action. — To flex 

 and adduct the hand. 



