350 



THE AKTICULATIONS OK JOINTS. 



Lig. Capituli Fibulae Anterius. The anterior ligament of the head of the fibula 



(Fig. 317) is a strong flat band whose fibres extend from the anterior aspect of 

 the fibular head, proximally and medially, to the adjoining part of the lateral 

 condyle of the tibia. 



Lig. Capituli Fibulae Posterius. The posterior ligament of the head of the fibula 

 (Fig. 319) is a similar, but weaker band, passing, proximally and medially, from the 

 posterior aspect of the fibular head to the posterior aspect of the lateral condyle 

 of the tibia, where it is attached immediately distal to the opening in the 

 capsule of the knee-joint, from which the tendon of the popliteus muscle escapes. 



Equally strong but much shorter bands are found on the lateral and medial 

 aspects of the joint. The former is intimately associated with the tendon of the 



Tibio-fibular interosseous membrane 



Distal end of shaft of tibia 



Groove on medial malleolus 



for tendon of tibialis 



posterior tendon 



Trochlear surface of 

 talus 



Deltoid ligamen 



Fibrous sheath for tendon of flexor 

 hallvcis longus 



Sustentaculum tali 

 Flexor hallucis longus tendon (cut 



Posterior calcaneo-taloid ligament 



Distal end of shaft of fibula 



Posterior ligament of 

 lateral malleolus 



Distal ligament of 

 lateral malleolus 



Facet on talus for 

 transverse distal tibio- 

 fibular ligament 



Posterior talo-fibular ligament 



Calcaneo-fibular ligament 



Calcaneus 



FIQ. 321. ANKLE-JOINT DISSECTED FROM BEHIND WITH PART OF THE ARTICULAR CAPSULE REMOVED. 



biceps flexor cruris muscle which strengthens the lateral aspect of the joint, and 

 here also is found the occasional opening by which it communicates with the knee- 

 joint. 



The synovial stratum is in certain cases continuous with that of the knee- 

 joint in the manner already described. 



Membrana Interossea Cruris. The interosseous membrane (Figs. 317 and 321) 

 plays the part of an accessory ligament both for the proximal and the distal tibio- 

 fibular joints. It is attached to the interosseous borders on the shafts of the tibia 

 and fibula, and binds them together. The general direction of its fibres is from the 

 tibia distally and laterally to the fibula, but many fibres pass in the opposite 

 direction. The membrane may extend upwards until it comes into contact with 

 the ligaments of the proximal tibio-fibular joint, but there is always a vertical oval 

 aperture in its proximal part for the forward passage of the anterior tibial vessels. 



