2 7 8 



PRACTICAL ANATOMY. 



10. The dorsi-lumbar cord is the communication of the first lumbar with the 

 last thoracic nerve ; the himbo-sacral cord is the communication of the lumbar 

 plexus with the sacral plexus. Find these two cords on the cadaver. 



Dissection of the Internal Iliac Artery (Fig. 191). The common iliac artery 

 divides into the internal and external. Use only the forceps when you develop 

 branches of vessels. Follow the direction of the artery and its branches as they 

 are given off, and find : 



1. The ureter, crossing into the pelvis at the bifurcation of the common iliac 

 artery, and its small ureteric in its sheath. 



2. The bladder being inflated, find the three vesical arteries superior, middle, 



Aperture for 



superior gluteal 

 vessels and nerve 



Aperture for 

 sciatic and pudic 

 vessels and nerve 



Coooygeal fibres of 

 levator ani 



Fibres of leva- 

 tor ani 



Sphincter ani 

 RECTUM 



White line ' of 

 obturator fascia 



Pubic attachment 

 of levator ani 



Tendinous centre 

 of periuitum 



FIG. 192. MUSCI.KS OF 'fiiK FLOOR OK THK PKLVIS. 

 (A portion of the ischial and pubic bones sawn away.) 



and inferior. In connection with the superior vesieal, find the obliterated Jiy t 

 gastric artery. 



3. Find also the middle luemorrlioidal, to the rectum, in company with syt 

 patlictie nerves from the pelvic plexus. 



4. Find the uterine artery ( Fig. 204) passing between the folds of the brc 

 ligament of the- uterus. 



5. Find the -vaginal arteries, three or four in number, anastomosing wit 

 die another and with the uterine. 



6. Trace the ilio-lnmbar between the psoas magnus and vertebral columi 

 at this point see it divide into an iliac and a lumbar branch. 



