REPORT ON THE BONES OF THE HUMAN SKELETON. 
7 
vertical and transverse diameters of the cotyloid at its brim, and more usually the 
vertical is a little greater than the transverse ; the letters v. and t. in the tables express 
the diameter which prevailed in each pelvis. In this and in the measurements of the 
obturator foramen the right innominate bone was selected. 
9 and 10 are the greatest diameters of the obturator foramen in the vertical and 
transverse directions. 
11. Obturator index expresses the relative height and width of this foramen, and is 
1 . , , , „ 1 transverse d. x 100 
obtamed by the formula vertical d 
12. Subpubic angle is taken with the useful goniometer devised and figured by 
Dr. Garson.^ 
B. Dimensions of Cavity of True Pelvis. 
These dimensions are to be taken at the brim, at the outlet, and in the 
cavity itself 
13. Transverse diameter is the greatest transverse width between the ilio-pectineal 
lines. 
14. Conjugate or antero-posterior diameter would in a fresh pelvis be taken from the 
mid-point on the promontory of the sacrum to the back of the upper end of the symphysial 
cartilage, but in the dried pelvis the posterior surface of the body of the os pubis 
immediately adjacent to the upper part of the region of the symphysis has been selected. 
In some pelves the body of the os pubis curves backward a little below the brim, but this 
projecting part has not been taken as the point on which to place the callipers. 
15. Pelvic or Brira index is the relation of the conjugate diameter to the transverse. 
It is computed by the formula employed by Professor Zaaijer,^ Tra^ns^erse^d^ ' which the 
transverse diameter is regarded as =100. 
16. Oblique diameter is the distance between the sacro-iliac joint on the one side, and 
the ilio-pectineal line on the opposite side of the brim internal to the pectineal eminence. 
As there is sometimes a want of symmetry in the pelvis, it is necessary that both the 
right and left oblique diameters should be taken. 
17. Inferior sagittal diameter is measured from the middle of the antero-inferior 
border of the body of the fifth sacral vertebra to the lower border of the pubic 
symphysis. 
18. Coccygeo-pubic diameter from the tip of the coccyx to the lower border of the 
1 Pelvimetry, Journ. Anat. and Phijs., vol. xvi. p. 106, pi. v., October 1881. 
2 Untersuchungen ueber die Form des Beckens Javanischer Frauen, Holldndischen Gesellschaft der Wissensch. zu 
Haarlem, Deal xxiv., 1866. 
