262 



INFERIOR EXTREMITY 



defined band, which is fixed firmly to the anterior part of the 

 calcaneus. As it is traced medially it will be seen to divide 

 into two diverging limbs. Of these the proximal is attached 

 to the medial malleolus, whilst the distal passes to the medial 

 margin of the foot, and becomes connected with the plantar 

 aponeurosis. The lig. transversum and the lig. cruciatum 

 cruris are merely portions of the deep fascia which are dis- 

 tinguishable on account of their thickness. 



The superior peroneal retinaculum is a thickened por- 

 tion of the deep fascia 

 which passes from the 

 posterior and distal part 

 of the lateral malleolus to 

 the proximal and posterior 

 part of the lateral surface 

 of the calcaneus. 



The inferior peroneal 



retinaculum springs from 

 the anterior part of the 

 proximal surface of the 

 calcaneus, where it is con- 

 tinuous with the lateral 

 extremity of the cruciate 

 ligament ; its opposite ex- 



FIG. 95. Diagrammatic representation of tremity is attached, On the 



the Fascia of the Leg. The fascia of the i , i u j r <.u r 



tibialis posterior is more a muscular lateral b rder f the f Ot > 



aponeurosis than a true fascial septum ; to the peroneal tubercle 



but it is convenient for descriptive pur- o f the calcaneus and tO 



poses to regard it as one of the parti- the kteral surface Q the 



calcaneus distal to the 



tubercle. The peroneal retinacula bind the tendons of the 

 peronaeus longus and brevis to the lateral border of the foot. 



Intermuscular Septa. As the deep fascia of the leg passes 

 posteriorly, over the fibular region, two strong intermuscular 

 septa are given off from its deep surface. These are dis- 

 tinguished as the anterior and posterior peroneal septa. 

 The anterior peroneal septum intervenes between the peroneal 

 muscles and the extensor muscles, and is attached to the 

 anterior border of the fibula. The posterior peroneal septum 

 is interposed between the peroneal muscles and the muscle 

 on the back of the leg, and is attached to the lateral border 

 of the fibula. The leg is thus subdivided into three osteo- 



