THE LIGAMENTS. 115 



131. Connection of the Tibia and Fibula. 



A. Superior, Articul. tibio-fibularis superior is immove- 

 able. The articular surface of the tibia, at the posterior part of 

 the Condyl. extern, tibise, Jooks downwards and outwards; that 

 of the fibula at the internal part of the superior extremity, up- 

 wards and inwards. 



Ligaments: 1. Lig. capsulare capit. fibula, passes obliquely outwards and 

 downwards from the border of the articular surface of the Condyl extern, lib. 

 to the Capitul. fibula ; it is short and strong. 



B. Inferior, JlrticuL tibio-fibular . inferior likewise imraove- 

 able. The articular surfaces are only in part grasped by one 

 another, and in other parts a strong interosseous ligament fills the 

 space between them. The synovial capsule belongs partly to the 

 tarsal joint. 



Malleolar ligaments: 1. Lig. tibio-fibul. anticum, between the anterior 

 tubercle of the Incis. peronaa tibia and that of the Malleolus extern, (fibula). 



2. Lig. tibio-fibul. post. , between the posterior tubercles of the same parts. 



Both divide into a superior and inferior fasciculus, pass obliquely from 

 above to below, and from within to without, and project beyond the articular 

 surfaces. 



C. Central, Membrana interossea cruris, stretched in the inter- 

 space between the tibia and fibula, it separates the anterior from 

 the posterior muscles of the leg; above it is broader than below; 

 externally and above, it has an opening for the Vasa tibial. an- 

 tica; below, it is perforated by the Vasa peronsealia. Its fibres 

 are directed obliquely from within, outwards and downwards. 

 Anteriorly are attached to it : mm. extensores hallucis et digitor 

 commun. longus; behind, m. tibialis poslicus, flex, digit, com- 

 mun. longus. 



132. Connection of the Foot with the Leg, Artie, pedis 



s. tibio-tarsalis. 



The ankle joint is a ginglymus ; that is to say, it consists of a 

 roller which moves forwards and backwards in a depression on 

 the tibia. 



Articular surfaces: 1. On the leg (tibia and fibula), a fossa 

 divided into two halves by a projection, bounded laterally by the 

 malleoli. 2. On the foot (talus), a roller, with lateral articular 

 surfaces, for the malleoli. 



Ligaments: a. Ligg. lateralia externa s. fibularia, three, passing from the 

 fibula either to the Talus or Calcaneus. 



1. Fibulare calcanei s. perpendiculare medium, roundish, under the sheaths of 

 the peronsei muscles, passes from the apex of the Malleolus extern, to the outer 

 side of the os calcis. 



