223 ZOOTOMY. 



handle of a small scalpel, and cut through, one by 

 one, the nerves which pass from its lower surface : 

 remove the whole organ and place it in strong 

 alcohol or in a saturated solution of zinc chloride 

 for subsequent examination (see § LV., p. 254). 

 XXVI. If time permit, continue backwards the incision 

 through the skin, and cut away the arches of all 

 the remaining vertebrse so as to expose the whole 

 spinal cord : in any case, remove the skin from 

 the middle region of the back just between the 

 thighs, and cut away the arches of the middle 

 sacral vertebrfe, so as to expose about an inch of 

 the cord in that region : note : 



183. The lumbar enlargement of the cord, and the 

 divergence of its dorsal columns, which enclose a diamond- 

 shaped depression, the sinus rhomboidalis, produced 

 by the widening of the central canal of the cord, and 

 covered only by its investing membrane or pia mater. 



184. If the whole cord is exposed, the brachial enlargement will 

 be seen between the shoulders as well as the very great proportional 

 length of the cervical region of the cord. 



XVII. Place the subject once more in the supine 



position (ventral surface uppermost), and make 



out the following points by merely turning the 



viscera about, and without cutting or tearing 



anything : 



185. The relations of the falciform ligament (§ 170) : 



in front it becomes attached to the pericardium : at its 



dorsal edge the two layers of which it is composed diverge, 



forming two laminae, of which the right passes across the 



duodenum and becomes attached to the posterior surface of 



the right lobe of the liver, forming the duod- no-hepatic 



omentum, while the left becomes attached to the peri- 



