460 MUSCLES. 



laces of the tibia and fibula bordering on this ligament, except- 

 ing one-third of the lower part of the fibula, and rather more of 

 the lower part of the tibia. 



The fleshy fibres run obliquely to a middle tendon which 

 passes in the groove at the back of the malleolus internus, and 

 is confined there by a fibro-cartilaginous noose, and invested by 

 a bursa. It is inserted into the posterior internal part of the os 

 naviculare or scaphoides, at its tuberosity; and also divides in 

 such a way as to be inserted into the internal and external cu- 

 neiform bones, into the os cuboides, and os calcis. 



It extends the foot, and presents the sole obliquely inwards. 

 It corresponds with the flexor radialis of the hand* 



SECT. IV. OF THE MUSCLES OF THE FOOT. 



The. Extensor Brevis Digitorum Pedis, 



Is a muscle situated on the superior surface of the foot. It is 

 placed beneath the tendons of the extensor longus, and arises, 

 tendinous and fleshy, from the fore upper part of the greater 

 apophysis of the os calcis, being intermixed with the origin of 

 the annular ligament of the ankle. It forms a short, fleshy bel- 

 ly, which is partially divided into four parts; from these parts 

 proceed as many tendons, which crossing very obliquely the 

 tendons of the extensor longus, are inserted into the great toe,, 

 and the three next toes, by joining with the tendons of the ex- 

 tensor longus, which are spread over their backs. The tendoa 

 going to the great toe has its principal insertion into the first 

 phalanx. 



It extends the toes.* 



When the Aponeurosis Plantaris is removed from the sole of 

 the foot, we see three muscles; the middle one having been co- 

 vered by the large central portion of the aponeurosis, is the 

 Flexor Brevis Digitorum Pedis; the outer, is the Abductor Mi- 

 nimi Digiti Pedis; and the inner, the Abductor Pollicis Pedis. 



* Varieties. The internal part, or belly, is sometimes distinct from the adjoin- 

 ing. In some very rare cases all the bellies are insulated, as in birds. Sometimes 

 it sends a tendon to the little toe. 



