MUSCLES OF THE FORE ARM. 421 



There is a bursa between the lower extremity of its tendon 

 and the trapezium ; the tendon is there held down by ligamen- 

 tous fibres. 



It bends the hand, and draws it towards the radius. 



3. The Palmaris Longus, 



Is at the ulnar side of the flexor carpi radialis, and is super- 

 ficial. It is a small short muscle, terminating in a long slen- 

 der tendon, and arises by a small tendon from the internal con- 

 dyle, and fleshy from the inter-muscular ligament on each of its 

 sides. 



It is inserted, tendinous, into the upper margin of the liga- 

 mentum carpi annulare anterius, near the root of the thumb; 

 and a division of its tendon passes on to the aponeurosis pal- 

 maris. 



It bends the hand, and makes tense the palmar aponeurosis.* 



4. The Flexor Manus vel Carpi Ulnar is, 



Occupies, among the superficial muscles, the ulnar side of the 

 fore arm. It arises, tendinous, from the internal condyle of the 

 os humeri, fleshy from the upper internal side of the olecranon, 

 and by a tendinous expansion, being a part of the fascia of the 

 fore arm, from the ridge at the internal side of the ulna to with- 

 in three or four inches of the wrist. 



It is inserted into the upper side of the os pisiforme by a 

 round tendon, which arises early at the radial margin of the 

 muscle, and receives the muscular fibres. Sometimes the ten- 

 don is continued over the os pisiforme, so as to be likewise in- 

 serted into the base of the metacarpal bone of the little finger. 

 There is a loose bursa at the junction of the tendon with the 

 pisiforme. 



It bends the hand, and draws it towards the ulna. 



* Varieties. Sometimes it is deficient in both arms; sometimes the middle part 

 only is fleshy; sometimes the belly goes almost to the wrist. 



VOL. I. 36 



