ANATOMY IN A NUTSHELL. 81 



minates in a flat tendon which turns over the outer margin of the radius. 



Origin. — One head. (1) immediately above internal condyle of humerus: 

 (2) common tendon: (3) fascia; i4i intermuscular septum. The other head, 

 thin fasciculus from inner side of coronoid process of ulna, joining first head at 

 an acute angle. (Plate XXIII.) 



Insertion. — Rough impression on middle of outer surface of shaft of 

 radius. (Plate XXV.) 



A' tii»n. — To pronate hand. 



Nerve Supply. — Median. 



Blood Supply. — Radial artery. 



Flexor carpi radialis. — Description. — (Plate XXIX.) — This muscle lies 

 on the inner side of the preceding muscle. It is slender and aponeurotic in 

 structure at its commencement above, but increases in size and terminates in 

 a tendon which forms rather more than the lower half of its length. This tendon 

 3£ s through a canal on the outer side of the annular ligament and runs 

 through a groove in the os trapezium. The radial artery lies between the ten- 

 don and the Supinator longus muscle, and may easily be tied in this situation. 



Origin. — (1) Internal condyle by common tendon: (2) fascia; (3) inter- 

 muscular septum. (Plate XXIII. 



Insertion. — (Plate XXYII.) — Bases of metacarpals of index and middle 

 finger.-. 



Action. — Flexor of wrist. 



Nerve Supply. — Median. 



Blood Supply. — Radial arterv. 



LESSON XIX. 



Palmaris longus. — Description. — (Plate XXIX.)— Thi- is a slender, 

 fusiform muscle lying on the inner side of the preceding. It is often absent 

 and is subject to much variation: it may be tedinous above and muscular 

 below: or it may be muscular in the center with a tendon above and below; 

 or it may present two muscular bundles with a central tendon: or finally, it 

 may consist simply of a mere tendinous band. 



Origin. — (1) Inner condyle of humerus by the common tendon: (2) deep 

 fascia: (3) intermuscular septa. (Plate XXIII.) 



Insertion. — Palmar fascia and occasionally a Tendinous ligamenl to shorl 

 muscles of thumb. (Plate XXIX 



\< tion. — Tenses palmar fascia. 



\i:i;\ i: Supply. — Median. 



Blood Supply. — Radial and ulnar arteries. 



Flexor carpi ulnarls. — Description.- Tins muscle lie- along the ulnar 

 Bide ^i the forearm. It arises by two head- connected by a tendinous arch, 

 beneath which pass the ulnar nerve and posterior ulnar recurrent artery. The 

 fibers terminate in a tendon which occupies the anterior part of the lower half 

 of the muscle. The ulnar artery lies on the outer side of this tendon, in the 

 lower two-thirds of the forearm. (Plate- XXIX-.W 



