

LIGAMENTS OF THE ANKLE JOINT. 



755 



the patella, receives the name of external and internal alar 

 ligaments, and another fold passing from this fatty matter 

 behind the patella upward and backward to the hollow be- 

 tween the condyles, is called ligamentum mucosum. (Fig. 246.) 



The tibia and fibula are connected at their extremities 

 by the superior and inferior tibio-fibular articulations, and 

 their shafts by an interosseous membrane. 



The superior articulation is formed of an anterior and a 

 posterior ligament, which pass from the head of the tibia 

 to the head of the fibula. There is also a distinct synovial 

 membrane. The inferior articulation has also an anterior 

 and a posterior ligament, which pass from the lower ex- 

 tremity of the fibula to contiguous portions of the tibia. 



A synovial membrane is seen communicating with the 

 ankle joint. 



The interosseous ligament fills the space between the two 

 bones, and passes from the external edge of the tibia to 

 the corresponding edge of the fibula. 



LIGAMENTS OF THE ANKLE JOINT. 



The bones com- A FlG - 247 



posing this joint 

 are the astrag- 

 alus below, and 

 the tibia and 

 fibula above. 



The anterior 

 ligament , not al- 

 ways distinct, 

 extends from the anterior margin of the tibia to the upper 

 part of the astragalus. 



FIG. 247, A represents Ligaments at the inner side of the Ankle Joint, a 

 Internal malleolus. 6 6 Part of astragalus, c Os calcis. d Scaphoides. e 

 Internal cuneiform bone. / Deltoid or internal lateral ligament, g Synovial 

 capsule, h Tendo-Achillis. 



FIG. 247, B represents Ligaments on the outer side of Ankle Joint, a Tibia. 

 b External malleolus. c c Astragalus, d Os calcis. e Cuboides. fg h Exter- 

 nal lateral ligament arranged into three fasciculi, anterior, middle, and poste- 

 rior, i Capsular ligament. 



