POSTERIOR ANTIBRACHIAL GROUP. 



227 



FLEXOR PEDIS PERFORATUS. 

 (Flexor SubUmis Epicondylo^phalangeus. ) 



(Fie. 81. 1.) 



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 

 baud 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 coronse. 



1'IG. 81. 



Internal view of the deep muscles 

 of the anterior limb, a, Capnt par- 

 vnm of triceps extensor brachii : 



Relation. Posteriorly with the flexor b - Flexor P*"* perft: *', 



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



rnetacarpi externus and medius ; anteri- anges : c c, Flexor pedis perforans : 

 orly with the perforans. Two important a^ff^. *-' ^ferfor ch'eSn^a- 

 synovial sheaths or canals are related ment ; d > Perforans tendon leaving 



" . , . . , , the sheath of perforatus tendon. 



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 



