232 FLEXOR CARPI RADIAL1S 



Relations. By its anterior surface with the fascia of the fore-aim, the 

 supinator longus, extensor carpi radialis longior and brevior, radial artery 

 and veins, and radial nerve. By its posterior surface with the brachialis 

 anticus, flexor sublimis digitorum, the ulnar artery and veins, and the me- 

 dian nerve after it has passed between the two heads of the muscle. By 

 its upper border it forms the inner boundary of the triangular space, in 

 which the termination of the brachial artery is situated. By its lower 

 border it is in relation with the flexor carpi radialis. 



The FLEXOR CARPI RADIALIS arises from the inner condyle and from 

 the intermuscular fascia. Its tendon passes through a groove formed by 

 the scaphoid bone and trapezium, to be inserted into the base of the meta- 

 carpal bone of the index finger. 



Relations. By its anterior surface with the fascia of the fore-arm, and 

 at the wrist with the tendinous canal through which its tendon passes. 

 By its posterior surface with the flexor sublimis digitorum, flexor longus 

 pollicis, wrist-joint, and groove in the scaphoid and trapezium bones. By 

 its outer border with the pronator radii teres, and radial artery and veins. 

 By its inner border with the palmaris longus. The tendon is surrounded 

 by a synovial membrane where it plays through the tendinous canal of the 

 wrist. 



The PALMARIS LONGUS is a small muscle which arises from the inner 

 condyle, and from the intermuscular fascia. It is inserted into the annular 

 ligament and palmar fascia. Occasionally this muscle is wanting. 



Relations. By its anterior surface with the fascia of the fore-arm. By 

 the posterior surface with the flexor sublimis digitorum : to the external 

 side by the flexor carpi radialis ; and to the internal side by the flexor carpi 

 ulnaris. 



Cut the flexor carpi radialis and palmaris longus from their origins, in 

 order to obtain a good view of the whole extent of origin of the flexor 

 sublimis digitorum. 



The FLEXOR SUBLIMIS DIGITORUM (perforatus) arises from the inner 

 condyle, internal lateral ligament, coronoid process of the ulna, and ob- 

 lique line of the radius. The median nerve and ulnar artery pass between 

 its origins. It divides into four tendons, which pass beneath the annular 

 ligament into the palm of the hand, and are inserted into the base of the 

 second phalanges of the fingers, splitting at their terminations to give 

 passage to the tendons of the deep flexors ; thence' its designation, per- 

 forates. In the thecaB of the fingers several small tendinous fasciculi are 

 generally found, which pass between the phalanges and the edges of the 

 tendons ; these have been termed the vincula accessoria. 



Relations. In the fore-arm. By its anterior surface with the pronator 

 radii teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and 

 the deep fascia. By its posterior surface with the flexor profundus digi- 

 torum, flexor longus pollicis, ulnar artery, veins and nerve, and median 

 nerve. This muscle frequently sends a fasciculus to the flexor longus 

 pollicis or flexor profundus. In the hand : its tendons, after passing be- 

 mads longus. 7 One of the fasciculi of the flexor sublimis digitorum ; the rest of the 

 muscle is seen beneath the tendons of the palmaris longus and flexor carpi radialis. 8. 

 The flexor carpi ulnaris. 9. The palmar fascia. 10. The palmaris brevis muscle. 11. 

 The abductor pollicis muscle. 12. One portion of the flexor brevis pollicis; the leading 

 Jme crosses a part of the adductor pollicis. 13. The supinator longus muscle. 14. The 

 extensor o?is m^tacarpi, and extensor primi internodii pollicis, curving around the 'o\ver 

 border of the fore-arm. 



