THE BONES OF THE LOWER LIMB 



255 



The inferior surface presents a large oval facet, concave from within 

 forwards and outwards, for articulation with the os calcis. The 

 posterior border is short, stout, and oblique, its direction being 

 inwards and forwards. It presents a groove, which is directed down- 



Head 



Neck — Jfc>-;: 



For Internal Malleolus .. 



For Tibia -•' 



Internal Tubercle 



Groove for 

 Flexor Longus Hallucis 



For External Malleolus 



External Tubercle 



Navicular Facet 



. Facet for Spring Ligament 



For Os Calcis •= -1 



Interosseous Groove ^ 



For Os Calcis 



Fig. 149. — The Right Astragalus. 

 A, Superior View ; B, Inferior View. 



wards and inwards, for the tendon of the flexor longus hallucis. 

 On either side of this groove there is a tubercle, the internal being 

 rudimentary, whilst the external is well developed and gives attach- 

 ment superiorly to the posterior fasciculus of the external lateral 

 ligament of the ankle-joint. 



