GENERAL PROPERTIES OF LIVING TISSUES 



to the vertebral column. The nerve itself should 

 not be touched with the instruments. Near the 

 pelvis it will be necessary to divide the pyriform 

 and the iliococcygeal muscles: carefully avoid 



the nerve while do- 

 ing this. 



With the forceps 

 lift the tip of the 

 urostyle (the 10th 

 vertebra, a long, slen- 

 der bone which forms 

 the caudal end of the 

 vertebral column) 

 and remove the bone 

 with the stout scissors 

 as far as the 9th 

 vertebra. Divide the 

 spinal column trans- 

 versely between the 

 Pig. i. Muscles or iea hind limb of 6th and 7th vertebrae. 



frog, dorsal view (Ecker and Wieders- rp urn ^ f j^^ 



heim). 



down. Bisect length- 

 wise the 7th, 8th, and 9th vertebrae. Grasp 

 the half from which the prepared nerve springs 

 and lift it gently, freeing the nerve with the 

 scissors down to the knee. 



Pass now to the leg. Cut through the Achil- 

 les tendon of the gastrocnemius muscle below 



pe 



