ARTICULATIONS. 



external facet. The middle fasciculus is a rounded cord run- 

 ning from the front of the tip of the malleolus to the outer side 

 of the os calcis just above the peroneal groove. The posterior, 

 the strongest, runs from the lower part of the fibular fossa on 

 the malleolus to the external tubercle and adjoining rough sur- 

 face on the posterior surface of the astragalus. The internal 

 lateral ligament (deltoid) runs from the impression on the lower 

 part of the malleolus to the scaphoid, astragalus, and os calcis, 

 spreading out in a continuous layer. It presents the following 

 special bands: (ligamentum talo-tibiale anticum) from the 

 front of the malleolus to the neck of the astragalus ; (ligamen- 

 tum talo-tibiale posticum) from the back of the malleolus to the 

 postero-internal rough surface of the astragalus ; (ligamentum 

 tibio-naviculare) from the tip of the malleolus to the inner 

 side of the scaphoid ; (ligamentum calcaneo-tibiale) from the 

 tip of the malleolus to the inner side of the sustentaculum 

 tali; and (ligamentum talo-tibiale profundum) deeper fibres 

 from the tip of the malleolus to the inner side of the 

 astragalus. [307] 



Intertarsal Joints. These are arthrodial diarthroses, as fol- 

 lows: The talo-calcanean is between the posterior calcanean 

 facet on the astragalus and the corresponding facet on the os 

 calcis. Its capsule consists of the following talo-calcaneal liga- 

 ments, viz.: Anterior, a band at the anterior end of the tarsal 

 canal, which descends from the antero-external aspect of the 

 neck of the astragalus to the adjacent upper surface of the os 

 calcis: External, short fibres connecting the adjacent outer 

 margins of the bones, in continuity with the posterior borders 

 of the preceding, and parallel to, but deeper than, the middle 

 fasciculus of the external lateral ligament: Posterior, fibres 

 radiating from the back of the external tubercle of the astrag- 

 alus to the upper surface of the os calcis, just behind the facet: 

 Internal, fibres passing from the inner posterior tubercle of 

 the astragalus to the posterior border of the sustentaculum 

 tali: Interosseous, strong fibres connecting the bottoms of the 



[265] 



