144 



TOPOGRAPHIC AND APPLIED ANATOMY. 



PLATE 19. 



The male pelvic outlet as seen from without. From a Leipzig model from nature (His) with the vessels and nerves 

 sketched in. 



2. The internal conjugate diagonal, measured in the living subject from the promontory to 

 trie lower margin of the symphysis (conjugata diagonalis), 12.5 centimeters (5 inches); 



3. The antero posterior diameter of the pelvic cavity or the width of the pelvis, from the 

 middle of the symphysis to the middle of the third sacral vertebra, 12.5 centimeters (5 inches); 



Fifth lumbar verte- 

 bra 



First sacral vertebra Afl^l 



Lateral sacral artery - 

 Sacral canal - 



Great sacrosciatic i 



foramen 



Greater sacrosciatic 



ligament 



Lesser sacrosciatic 



foramen 



Fifth sacral vertebra 



Lower sacrosciatic 

 ligament 



First coccygeal ver 



tebra 



-Anterior superior spine of ilium 



Anterior inferior spine of ilium 



Symphysis 

 ' Obturator foramen 



FIG. 70. A sagittal section of the female pelvis with the anteroposterior pelvic diameters, i, The anteropos- 

 terior diameter of the pelvic inlet (conjugata vera); 2, the internal conjugate diagonal (conjugata diagonalis); 3, 

 the anteroposterior diameter of the pelvic cavity; 4, the anteroposterior diameter of the plane of pelvic contraction; 

 5, the anteroposterior diameter of the pelvic outlet; A, the pelvic axis or curve. 



4. The anteroposterior diameter of the plane of pelvic contraction, from the lower margin 

 of the symphysis to the intervertebral disc between the last sacral and the first coccygeal vertebra, 

 11.5 centimeters (4f inches); 



5. The anteroposterior diameter of the pelvic outlet from the lower margin of the symphysis 

 to the tip of the coccyx, 10 to 12 centimeters (4 to 5 inches). This diameter varies on account of 

 the ability of the coccyx to become displaced posteriorly. 



The pelvic axis (A in Fig. 70) or pelvic curve is the curved line which connects the middle 

 points of the anteroposterior diameters. 



