BONES OF FOOT 53 



from without inwards and forwards, and just in front of this a 

 groove for the tendon of peroneus longus. 



Ossification. The astragalus and the os calcis are partially 

 ossified at birth. The other bones commence early in life, and 

 the tarsus is completely ossified by the twentieth year. 



The Metatarsus resembles the metacarpus, and consists of five 

 long bones articulating with the tarsus behind and supporting 

 the phalanges in front. 



The first metatarsal is the shortest and stoutest and the second 

 metatarsal the longest. The fifth metatarsal has a prominent 

 tubercle projecting backwards from the outer side of the base, 

 which can easily be felt in the living subject. The metatarsals 

 articulate with one another by their bases. 



Ossification. Similar to that of the metacarpus. 



The Phalanges of the toes resemble those of the fingers in 

 shape and number (fourteen in all). They are, however, much 

 smaller proportionately^ and in the smaller toes the second and 

 third phalanges are often compressed to mere nodules. 



Ossification. Similar to that of the fingers. 



Articulations of the Pelvis. 



Lumbo-SaCPal Joint. This takes place between the fifth 

 lumbar vertebra and the sacrum, and is similar to the other 

 intervertebral joints. It has, however, an accessory ligament, the 

 lateral lumbo-sacral ligament, which is attached to the front of 

 the transverse process of the fifth lumbar vertebra and the front 

 of the sacrum close to the sacro-iliac joint. 



SaCPO-Iliac Joint between the articulating portion of the 

 wing of the ilium and the similar auricular surface on the 

 sacrum. The joint surfaces are very closely applied to one 

 another, so that movement is limited, as great stability is required 

 rather than free movement. The joints are just movable enough 

 to prevent absolute rigidity, and their roughened surfaces prevent 

 gliding to any extent. 



Ligaments. A capsular ligament surrounds the joint, which is 

 strengthened by transverse fibres dorsally and ventrally. 



The synovial membrane is rudimentary. 



Accessmy Ligaments : The Ilio-Lumbar ligament extends from 



