THE LIMB IN SECTION 39 



Connecting this edge with the corresponding edge of the other sesamoid 

 anteriorly is the inter-sesamoidean ligament, behind which the edges are 

 covered by a layer of cartilage. The posterior aspect of the cartilage is 

 lined by the sheath, which here forms an elliptical tube to envelop the 

 tendons of the superficial and deep flexors of the digit. The transverse 

 dimension of the perforans tendon is seen to be not nearly so great as 

 is that of the perforatus, and the latter is observed to curve round 

 either edge of the perforans towards its anterior surface. 



Related to the edge of the perforatus tendon, but outside the sheath, 

 we have the following structures. Anteriorly is placed the digital vein, 

 behind which is one of the digital divisions of the plantar nerve, which 

 after division of the latter has crossed the artery to become placed behind 

 the vein. Posteriorly placed to the nerve referred to is the digital 

 artery, and behind this again is the posterior digital division of the 

 plantar nerve. 



On the posterior aspect of the perforatus tendon, and between the 

 sheath and the skin, there is represented a considerable quantity of fibro- 

 fatty material. 



