EEPORT ON THE SPHENISCID^. 121 



Relations. — The muscle separates the flexor perforatus digiti medii from the flexor 

 digitorum perforans. 



Nerve sujiply. — A branch of the sciatic nerve. 



3. Flexor perforatus digiti medii. 



Le flecliissew perfore (part of), Vicq d'Azyr, 1774, p. 512, No. 3. 

 Der durchbohrfe Beuger der mittleren Zelie, Tiedeinann, p. 341, No. 3. 

 Der durchholirte Beuger der Mittelzehe, Wiedemann, p. 103. 

 Flechisseur commun perfore, Cuvier, voL i. p. 396. 

 Muscle No. 2 (part of), Meckel, vol. vi. p. 116. 

 Flexor perforatus (part of), Reid, p. 144. 

 Flexor perforatus digitorum pedis, thbd (') part, Owen, p. 39. 

 Flechisseur perfore, coucheprofonde, Gervais and Alix, p. 36. 



Attachments. — This muscle arises, along with the preceding, from the depression 

 above the internal condyle of the femur. The belly of the muscle becomes distinct from 

 the common muscular mass opposite the junction of the upper and middle thirds of the 

 tibia, and is joined by a portion of the tendon of the ambiens muscle. The muscular 

 fibres terminate on a tendon, which, after passing through a canal in the fibro-cartilage 

 behind the ankle joint, and being slit for the transmission of the tendons of the flexor 

 perforans et perforatus, as well as for that of the flexor perforans, is inserted into the base 

 of the second phalanx of the third (middle) toe. This tendon is united to that of the 

 peroneus longus by means of the transverse slip described in connection with that muscle 

 (see peroneus longus, p. 123). 



Action. — This muscle flexes the middle toe. 



Relations. — The muscle is concealed superficially by the flexor perforatus of the outer 

 toe. It rests upon the flexor perforatus of the inner toe. 



Nerve supiily. — A branch from the sciatic nerve. 



4. Flexor perforatus digiti externi. 



Le flecMsseur perfore (part of), Vicq d'Azyr, 1774, p. 512, No. 3. 



Dei' durchhohrte Beuger der dusseren Zehe, Wiedemann, p. 104. 



Der durchhohrte Beuger der dusseren Zehe, Tiedemann, p. 342, No. 4. 



Flechisseur commun perfore, Cuvier, voL i. p. 396. 



Muscle No. 2 (part of), Meckel, vol. vL p. 116. 



Flexor perforatus digitorum pedis (fourth portion), Owen, p. 39. 



Flexor perforatus (part of), Eeid, p. 144. 



FlecMsseur perfore, couche profonde, Gervais and Alix, p. 36. 



Attachments. — This and the two preceding muscles together form a single muscular 

 mass, which arises from a deep depression on the posterior surface of the femur, 

 immediately above the internal condyle. 



(ZOOL. CHALL. EXP. PART XVIII. 1883.) S 16 



