PELVIS. 93 



externus, obliquus internus, tranversalis, rectus, pyramidalis, pecti- 

 neus, and psoas parvus ; by its external surface, the adductor longus, 

 adductor brevis and gracilis ; by its internal surface, the levator ani, 

 compressor urethrae, and obturator internus ; and by the ramus, the 

 adductor rnagnus, and accelerator urinae. 



PELVIS. 



The pelvis considered as a whole is divisible into a false and true 

 pelvis ; the former is the expanded portion, bounded on each side by 



Fig. 40.* 



* A female pelvis. 1. The last lumbar vertebra. 2, 2. The intervertebral 

 substance connecting the last lumbar vertebra with the fourth and sacrum. 3. 

 The promontory of the sacrum. 4. The anterior surface of the sacrum, on 

 which its transverse lines and foramina are seen. 5. The tip of the coccyx. 

 6, 6. The iliac fossae, forming the lateral boundaries of the false pelvis. 7. The 

 anterior superior spinous process of the ilium ; left side. 8. The anterior infe- 

 rior spinous process. 9. The acetabulum. a. The notch of the acetabulum. 

 b. The body of the ischium. c. Its tuberosity. d. The spine of the ischium 

 seen through the obturator foramen, e. The os pubis. /. The symphysis pu- 

 bis. g. The arch of the pubes. h. The angle of the os pubis. i. The spine of 

 the pubes ; the prominent ridge between h and i is the crest of the pubes. 

 k, k. The pectineal line of the pubes. I, I. The ilio-pectineal line ; in, in, the 

 prolongation of this line to the promontory of the sacrum. The line repre- 

 sented by h, i. k, k. I, I, and m, m. is the brim of the true pelvis, n. The ilio- 

 pectineal eminence, o. The smooth surface which supports the femoral vessels. 

 p, p. The great sacro-ischiatic notch. 



