104 



BOXES OF THE LOWER LIMB. 



long diameter directed downwards and outwards ; in the female it is 

 more triangular, or narrowed at its lower part. In the recent state it 

 is closed by a fibrous membrane, except in the neighbourhood of the 

 groove in its upper margin. 



THE PELVIS. 



The ossa innominata with the sacrum and coccyx form the osseous 

 walls of the pelvis. 



Fig. 90. 



Fig. 90. 



Adult Male Pelvis 

 seen from befoke, 

 in the erect at- 

 titude op the 



BODY. (A. T.) If 



1, 2, anterior ex- 

 tremities of the 

 crests of the ilia in 

 front of the widest 

 transverse diameter 

 of the upi^er or false 

 pelvis ; 3, 4, aceta- 

 bula ; 5, 5, obturator 

 foramina ; 6, sub- 

 pubic angle or arch. 



Fig. 9L 



Adult Female Pel- 

 vis (A. T.) .{ 



Similarly jjlaced with 

 that shown in the 

 preceding figure, and 

 illustrating by com- 

 parison with it, the 

 principal differences 

 between the male and 

 female pelvis. The 

 numbers indicate the 

 same parts as in the 

 preceding figure. 



This part of the s eleton may be considered ns divided into two parts 

 by a plane passing through the upper border of the symphysis pubis, the 

 sacral promontory, and the ilio-pectineal lines. The circle tlius com- 

 pleted constitutes the brim or Metoi the lower or frue pdvis ; the s[)ace 

 above it, between the iliac fossae, belongs really to rhe abdomen, but has 

 been called the upper or false pelvis. The inferior circumference, or 

 oiitlei of the pelvis, presents three large bony eminences, the coccyx and 

 the tuberosities of the ischia. Between the tnljcrosities of the ischia 

 in front is the siih-puhic arch, which bounds an angular space 

 extending forwards to the symphysis, and is formed by the descending 

 rami of the ossa pubis and the ascending rami of the ischia. The 



