MUSCLES OF THE FOREARM. 87 



Subanconeus, front the humerus above the olecranon fossa, into the poste- 

 rior ligament of the elbow-joint. Action, probably a tensor of the ligament 

 Nerve, musculo-spiral. 



MUSCLES OF THE FOREARM. 



Muscles of the forearm (20), arranged in groups of five and threes. (Pancoast.J 

 ANTERIORLY, 5 flexors, 2 pronators, I tensor of palmar fascia : 

 Flexor Carpi Radialis. Pronator Radii Teres. 



Flexor Carpi Ulnaris. Pronator Quadratus. 



Flexor Longus Pollicis. Palmaris Longus. 



Flexor Sublimis Digitorum Perforatus Manis. 

 Flexor Profundus Digitorum Perforans Manis. 

 POSTERIORLY (12), in 4 sets of threes: 



Supinator Longus. Extensor Indicts. 



Extensor Carpi Radialis Longior. Extensor Communis Digitoruni* 



Extensor Carpi Radialis Brevior* Extensor Minimi Digiti. 



Extensor Ossis Metacarpi Pollicis. Extensor Carpi Ulnaris. 



Extensor Primi Internodii Pollicis. Anconeus. 



Extensor Secundi Internodii Pollicis. Supinator Brcvis. 

 Pronator Radii Teres, 4 by 2 heads, one from above the internal condyle of 

 the humerus, the common tendon, fascia, and the intermuscular septum ; the 

 other from the inner side of the coronoid process of the ulna, into a rough 

 ridge on the outer side of the shaft of the radius, about its middle. Action, 

 to pronate the hand. Nerve, median, which passes between the 2 heads 

 of the muscle. 



Flexor Carpi Radialis, 5 from the internal condyle by the common tendon, the 

 fascia, and intermuscular septa, into the base of the metacarpal bone of the 

 index finger. Action, to flex the wrist. Nerve, median. 



Palmaris Longus, 6 from the same origin as the flexor carpi radialis, into the 

 annular ligament and the palmar fascia. 9 Action, to make the palmar fascia 

 tense. Nerve, median. 



Flexor Carpi Ulnaris, 8 by 2 heads, one from the internal condyle by the 

 common tendon, the other from the inner margin of the olecranon, the 

 upper two-thirds of the posterior border of the ulna, and the intermuscular 

 septum, into the pisiform bone, the annular ligament, and the base of the 

 5th metacarpal bone. Action, to flex the wrist. Nerve, ulnar. 

 Flexor Sublimis Digitorum (Perforatus), 7 by 3 heads, one from the inner 

 condyle by the common tendon, the internal lateral ligament, and the inter 

 muscular septum; the 2d from the inner side of the coronoid process; the 

 3d from the oblique line of the radius, into the lateral margins of the second 



