224 DETAILED SYNTHESIS. 



Lower Extremities. 



367. THE HIP OR INNOMINATE (no name) BONES 

 are two, of very irregular shape, and consolidated from 

 three, the Ilium, Ischium, and Pubis, which, together 

 with the Sacrum, form a bony ring or bowl without a 

 bottom, called the pelvis. (See Fig. 1, PL 14.) 



368. THE HIP-BONES ARE STRONGLY BOUND by liga- 

 ments to each side of the Sacrum, and curving round 

 are united in front by an immovable joint on the central 

 line of the body, called the pubic symphysis. 



369. THE INNER SURFACE OF THE HIP-BONES is 

 smooth though irregular, and adapted to support the 

 organs found within them ; the external surface is very 

 uneven and irregular, adapted to give attachment to 

 numerous muscles. 



FIG. 169. 



Fig. 169 represents a section of the pelvis (through its sockets) and the 

 heads of the thigh-bones, showing the outline of the form of the outer and 

 inner surfaces at those points, and 1, 2, the spongiform structure of the in- 

 ternal part of the hip and thigh bones. 5, Femoral artery and vein. 



370. IN THE OUTER SURFACE OF THE HIP-BONES 



THERE is EXCAVATED a deep socket, the deepest in the 

 body, into which the thigh-bone is fastened by a central 



867. What ? 868. How ? 369. What said ? Describe Fig. 169. What 

 in the cancelli ? 870. What ? 



