70 

 THE CENTRAL NERVOUS SYSTEM. 



"W*. 

 LABORATORY WORK FOR THE- J- WEEK. *cj - 



References : CA/v . > vi ^ . T_^L, ^V^*^ -t^) ^ b ou 

 Points for Quiz: 

 Laboratory Report : 



Go to the delivery desk for (#) paraffin section 160, (b) prepar- 

 ations already stained 161, 162, 164-168, (V) section 163 will be 

 given you some time during the first period. 



MYEL (SPINAL CORD). 



1 60. Cervical my el. Transection. votn Rath's 



fluid ; paraffin ; sections JA.. Stain with hematoxylin 2-3 



hours, picric alcohol 30 seconds or longer. 



Gross anatomy : Examine the preparations of myel, noting the 

 three regions cervical, thoracic and lumbar ; the end of the seg- 

 ment of myel, observing the halves separated by the dorsal septum 

 and the ventral fissure, the central gray matter, cinerea, and the 

 superficial, ectal alba (white matter) ; the spinal nerves formed by 

 the union of a dorsal and a ventral root, the former with an enlarge- 

 ment the ganglion. 



In the section recognize (a*) the lateral halves, () the ventral 

 fissure, (c) the dorsal septum, (d} the central cavity myelocoele 

 with its lining epithelium endyma. In the cinerea note (/) the 

 rough division into lateral masses connected by a commissure 

 surrounding the myelocoele, (2) the dorsal and ventral cornua. In 

 studying the structure of the cinerea note (a) the general 

 structural appearance of the substantia spongiosa and substantia 

 gelatinosa, () the size and character of the nerve cells in the ven- 

 tral cornua, in the dorsal cornua, and intermediate region. Con- 

 sider the significance of the large cells of the ventral cornu. In the 

 alba, distinguish the dorsal columns and the roughly defined lateral 



