54 



Bones of the Trunk. 



Cofnu sa 



Hint us sacral, is 



The Sacral Bone, ()s sacrum, posterior view. 



Behind the base is the triangular opening of the sacral canal, 

 Canalis xacrali, which pierces the sacrum and is a continuation of the 

 Canal is vwtobralis ; on both sides of it the superior articular processes 

 of the first sacral vertebra project. The posterior surface is convex; 

 along it runs the Crista sacral is media; on both sides are the Cristae sacralcs 

 latcrales. At the lower end of the Crista sacral is media is the inferior 

 opening of the sacral canal, the Hiatus sacrali* ; at the sides of it are 

 the Cornua sacral ia, indistinct descending articular processes of the fifth 

 sacral vertebra. The posterior sacral foramina, Foramina sacralia 

 postcriora, are smaller and more irregular than the anterior. 



