480 GENERAL REMARKS UPON THE PELVIS. 



symphysis pubis is thicker in the female, the tuberosities are 

 further apart, and the acetabula more distant from each 

 other. All the bones of the female pelvis are more delicate, 

 rounder, and thin ; and its diameters are greater than those 

 of the male. 



The average diameters of the female pelvis are given as 

 follows (Fig. 145.) In the superior strait there are three, 

 the antero-posterior, transverse, and oblique. 



The first extends from the middle of the promontory of 

 FIG. 145. the sacrum to the superior 



part of the symphysis pu- 

 bis, and measures about 

 four inches. The second, 

 or transverse, extends from 

 the central part of the su- 

 perior strait, on the one 

 side, to a similar point on 

 the opposite, and measures 

 about five inches. The third, or oblique diameter, measures 

 about four and a half inches, and reaches from the sacro- 

 iliac junction to the opposite ilio-pectineal eminence. 



TABLE OF MEASUREMENTS OF THE MALE AND FEMALE PELVIS, 

 BY MECKEL. 



MALE. FEMALE. 



Transverse diameter of great pelvis between anterior In. Lines. In. Lines. 



and superior spinous processes of ilia, 7886 



Distance between crista of ilia, 8394 



Transverse diameter of superior strait, 465 



Oblique diameter of superior strait, 4545 



Transverse diameter of the cavity, 4 48 



Oblique diameter of the cavity, 5 54 



Antero-posterior diameter of the cavity, 5 48 



Transverse diameter of lower strait, 3 45 



Antero-posterior diameter of lower strait, 33 44 



This latter diameter, from the mobility of the coccyx in 

 the female, can be increased to five inches. 



FIG. 145 represents the average diameters of the superior Strait of the fe- 

 male Pelvis. 1 3 Oblique diameters. 2 Transverse. 4 Antero-posterior or 

 sacro-pubic diameter. 



