116 SPECIAL ANATOMY. 



. 2. Fibulare astragali anticum, very short, from the anterior border of the 

 Mall, extern, to the Astragalus, below broader. 



3. Fibulare astragali posiicum, close upon the capsule, almost horizontal, 

 from the fossa within and behind on the malleolus to the posterior border of 

 the Talus or Astragalus. 



b. Lig. laterals internum s. tibiak, stronger than the anterior, consisting of 

 two layers; 



\. Superfidale s. defroideum, from the apex and the anterior and posterior 

 border of the malleolus intern, to the calcaneus and lig. calcaneo-navirulare ; the 

 most anterior fibres, that is, lig. later, intern, anlerius, a thin layer, passes 

 directly forwards to the collum astragal, and os navicul. 



2. Profund-um, below this, stronger, outwards and downwards; from the 

 apex and the borders of the malleolus to the internal part of the Talus, below 

 the articular surface. 



The Synovial capsule is very loose anteriorly, and covered with fat. 



Movements: 1. Flexion. The Talus glides from before, back- 

 wards; the Collum tali meets the anterior border of the articular 

 fossa, so that dislocation is scarcely possible. The dorsum of the 

 foot moves upwards and backwards. 



2. Extension: Talus glides from behind, forwards. Displace- 

 ment is rare. The dorsum of the foot moves downwards and for- 

 wards. Lateral motion does not take place in this, but in the 

 tarsal joints. 



133. Connection of the Tarsus, Jlrtw. tarsi. 



1. The first row, that is, Talus and Calcaneus, are united in a 

 limited Jlrthrodia, by which the lateral movements of the foot are 

 performed. 



Articular surfaces : On the inferior surfaces of the 7\ilus an 

 anterior convex and a posterior concave. On the superior surface 

 of the calcaneus, a posterior convex and an anterior concave. 



Ligaments: 1. Lig. inteross. (s. Jlpparat. ligamentosus sinus tarn), .strong. 



2. Lig. capsulare astragalo-calcaneum (Synovial capsule), thin; internally 

 strengthened by the fibrous sheaths for the tendons of the M. libiuhs pos:..Jlex. 

 digitor. comm., andpropr. hallucis; anteriorly and posteriorly, by small bundles 

 of. fibres. 



134. II. The second row, namely, 



Ossa cuneiformia, three in number, naviculare and cuboidtum, 

 are united in close articulations, am/j/iiarthroses, with one another. 



a. Os naviculare unites anteriorly with the three cuneiform 

 bones by an articular surface divided into three facettes, each of 

 which is triangular. The ligaments are: 



1. Lig. dorsalia, two for the Os cuneiforme /., straight from bffore to behind ; 

 one for each of the two others, passing obli juely forwards and outwards. 



