THE PELVIS AS A WHOLE. 



343 



Antero-posterior 

 Transverse . . . 

 Oblique . . . . 



Inlet. 

 Cm. (Inches). 



10.25 (4) 



12.75 (5) 

 12.00 (4^) 



DIAMETERS OF THE TRUE PELVIS. 



Male. 

 Cavity. 



Cm. (Inches). 



II. 5 U/z) 

 12.0(4^) 



II-5 (4>^) 



Outlet. 

 Cm. (Inches). 



8.25 (3X) 

 900 (3/2) 

 10.25 (4) 



Inlet. 

 Cm. (Inches). 



10.25 (4) 



13-25 is'X) 



12.75 (5) 



Female. 

 Cavity. 



Outlet. 

 Cm. (Inches). Cm. (Inches). 



II. 5 (4>^) 



12.75 (5) 

 12.75 (5) 



13.25 (sX) 



12.0 (414:) 

 ii.5(4M) 



The index of the pelvis, of interest in anthropology, is the proportion of the 

 antero-posterior diameter to the transverse at the pelvic inlet, the latter being 100. 

 This index is 80 for European males and 78 for females (Verneau). In the lower 

 races it is considerably higher, implying a narrower pelvis. Pelves with indices 

 below 90 are platypellic, with indices from 90 to 95 viesatipellic, and above 95 

 dolichopellic. 



Another index to show the relative depth of the pelvis is the proportion of the 

 breadth between the most distant points of the iliac crests to the height from the 

 top of the crest to the tuberosity of the ischium, the latter being 100. According to 



Fig. 366. 



Female pelvis from before. 



Topinard, this index is 126.6 for male and 136.9 for female Europeans. It is lower 

 in the lower races, showing that in them the pelvis is relatively deeper. 



Differences due to Sex. — The sexual differences of the pelvis are far more 

 marked than those of any other part of the skeleton. The male pelvis is deeper and 

 narrower, the female shorter and broader. It is to be noted that the greater breadth 

 of the female applies essentially to the true pelvis. At the inlet this is both relatively 

 and absolutely broader in woman. The male promontory is more projecting. The 

 most characteristic feature is the pubic arch, which is of a much greater angle in 

 woman. According to Verneau, it is from 38° to 77° in the male, with an average 

 of 60° ; and from 56° to 104° in the female, with an average of 74°. The symphy- 

 sis is shorter in woman, and the borders of the arch probably more everted. The 



