POSTERIOR ANTIBRACHIAL GROUP. 



9.-27 



FLEXOR PEDIS PERFORATUS. 



{Flexor Sahlimis — Epicondylo-phalangeus. ) 



(Fig. 81. h.) 



Situated in the posterior region of the 

 fore-arm, under the flexors of the carpus, 

 this muscle is -long, thin, and prismatic, 

 its belly being fleshy, with tendinous 

 intersections, and extending almost to the 

 carpus, where it is succeeded by a long 

 tendon, which passes through a synovial 

 sheath behind the joint, closed in by the 

 posterior annular ligament. Above the 

 carpus, the tendon is joined by a broad 

 band of fibrous tissue, called the superior 

 carpal or superior " check " ligament, 

 which springs from the infero-posterior 

 surface of the radius, being also attached 

 to the antibrachial fascia, and usually to 

 the perforans muscle ; below the knee, 

 the tendon assists in the formation of a 

 synovial sheath for the tendon of the 

 flexor perforans. At the fetlock it ex- 

 pands and forms a ring or sheath, through 

 which passes the perforans tendon, hence 

 the names perforans and perforatus; below 

 the pastern joint the tendon divides into 

 two. 



Origin. — From the summit of the epi- 

 condyle, by a tendon common to it and 

 the perforans. 



Insertion. — To the projecting lateral 

 parts of the os corona?. 



Relation. — Posteriorly with the flexor 

 metacarpi externus and medius ; anteri- 

 orly with the perforans. Two important 

 synovial sheaths or canals are related 

 with this and the perforans tendon, 

 the carpal and the metacarpo-phalangeal. The first, to which 

 is attached the antibrachial fascia, is formed by the posterior 



Fio. 81. 



Internal view of the deep muscles 

 of the anterior limb, a, Caput par-, 

 vum of triceps extensor brachii ; 

 &, Flexor pedis perforatus ; 6', Its 

 tendon ; 6" V", Slips to the phal- 

 anges ; c c, Flexor pedis perforans ; 

 c', Radialis accessorius ; c", Ulnaris 

 accessorius ; c'", Inferior check liga- 

 ment ; d, Perforans tendon leaving 

 the sheath of oerforatus tendon. 



