PLATE LXXII. 

 SECOND SIDE VIEW OF A MALE PELVIS. 



In this dissection, which is a continuation of that represented in the previous plate, 

 the spine of the ischium lias been turned down with the coccygeus muscle, and the 

 levator ani separated from the spine and also turned down, being cut away from ita 

 attachment to the pubes. The capsule of the prostate has been opened to expose the 

 gland. Fig. II. shows a side view of the levator ani muscle. 



The accompanying diagram has been introduced to show the reflections of the 

 pelvic fascia. The plane of section passes from the anterior superior iliac spine through 

 the anus. The so-called white line in the diagram has been shown as the point af 



..jnfen'or 

 V /Subtrior 



* / 



Iliacuf muscle 



,. 



OltUratbr mlernus -J^ 

 Leuator am 



1 " ' - J '^~l\ 



Ischio-rectal fossa V^i^Vi 



y ^7 Reclb vesical fascia 

 cocks canal 



nal fascia 



Lxl sphincter 



splitting of the obturator from the recto-vosical fascia, although the levator ani often by 

 its higher origin splits the two fascia farther up. It also shows clearly how the ischio- 

 rectal fossa is bounded on the sides by the obturator and anal fasciae. 



Dr. Symington, 1 in making frozen sections of the pelvis, has proved that the usual 

 description of the last part of the rectum is incorrect. He finds, 1st, that the second 

 portion of the rectum is sacculated, and not a cylinder the valves of Houston being 

 situated between the sacculi and that there is a slight cul-dc-sac in the rectum just as 

 it turns down to the anus, even when empty. 



2nd (Third portion). The anus or anal passage is one inch in length, and has 

 its lateral walls in contact save during deftecation ; it is, in fact, an antero-posterior 



slit. 



1 Dr. Symington, Journal of Anatomy and Physiology, vol. xxiii. p. 100. 



