230 MYOLOGY. 



passing obliquely downwards and inwards ; it has a short, thick, 

 fleshy belly, ending in a long, slender, flat tendon. 



OHgin. — From the posterior border and summit of the ole^ 

 cranon. 



Insertion. — It blends with, and helps to form the tendon of 

 the perforans near the carpus. 



Relation. — Superiorly with the fascia ; internally with the 

 flexor metacarpi internus ; externally with the medius. 



Action. — It assists the flexor perforans. 



RADIALIS ACCESSORIUS. 



{Flexor Accessorius Profundus.) 



(Fig. 81. c'.) 



A small muscle situated on the postero- inferior part of the- 

 radius. Somewhat radiating, flat, and elongated, passing down- 

 wards and slightly inwards, it ends above the knee in a slender 

 tendon. 



Origin. — From the posterior part of the shaft of the radius. 



Insertion. — It joins the tendon of the perforans. 



Relation. — Anteriorly with the radius ; posteriorly with th& 

 perforatus and perforans. 



Action. — To assist the flexor perforans. 



Metacarpal Eegion. 



Below the carpus we find only two pairs of exceedingly small 

 muscles : — 



Interossei metacarpei. 

 Lumbricales. 



INTEROSSEI METACARPEI. 

 (Interossei Palmares, Human.) 



Situated on the inside of the small metacarpal bones, these 

 muscles each consist of a thin, fleshy belly, and a long, slender 

 tendon, which sometimes joins the band extending from the 

 suspensory ligament to the extensor tendon, or may join the 

 tendon itself. These muscles belong to the rudimentary small 

 metacarpal bones, and hence are themselves rudimentary ; the 

 interosseus of the middle bone is usually considered as being 

 represented by the suspensory ligament 



