76 



This preparation will demonstrate the real form of the cells 

 already seen in 172. Find good examples of the small pyramidal 

 and large pyramidal cells, and note the extent of the apical process 

 and the number and length of the dendrites arising from it and from 

 the cell body. Trace the neurite as far as possible. Can you find 

 collaterals arising from it ? Find also good examples of well impreg- 

 nated cells firom the layer of polymorphous cells. Doubtless glia 

 (spider) cells will also be stained. Compare preparation 172. 



174. Hippocamp. Cat. Transection of the hippocamp and 

 adjacent parts. Weigert's hematoxylin method ; collodion ; sec- 

 tions yu. Now in 95% alcohol. Clear and mount in balsam. 



The parts to be recognized in this preparation are (i) the hip- 

 pocampal gyre, (2) hippocampus, (j) dentate gyre, (^) fimbria, 

 (5) the rima with the plexus, (6) the caudatum. Note the con- 

 tinuation of the cortex of the hippocampal gyre as the grey matter 

 of the hippocamp and dentate gyre ; observe the massing of large 

 pyramidal cells in the hippocamp and the dense layer of small pyra- 

 midal cells in the dentate gyre, the continuation of the fimbria with 

 the central (sub-cortical) alba. Recognize that the hippocamp is 

 an infolding of the cortex. 



175. Caudatum, Lenticula, and Thalamus. Transection 

 through a hemicerebrum (or part) including these masses of cinerea 

 (ento-cinerea). Weigert's hematoxylin method ; sections //. 

 Now in alcohol. Clear and mount in alkaline balsam. 



Ivocate in this preparation the cortex, the caudatum, lenticula, 

 claustrum and thalamus ; between the claustrum and the lenticula 

 the external capsule ; between the lenticula and thalamus (and cau- 

 datum) the internal capsule. The internal capsule is the continua- 

 tion of the crusta (168) ; the subthalmic region is continuous with 

 the tegmentum ; the thalamus and subthalamus constitute the larger 

 portion of the diencephal, intermediate between the mesencephal 

 (168) and the cerebrum (prosencephal). Consult the transections 

 of brain and the special references given. 



176. Olfactory bulbs. Rabbit. Transection ; vom Rath's 

 fluid ; paraffin ; sections /i. Stain with hematoxylin ( i hour) 

 and picrofuchsin. 



Recognize the following layers: (i) the layer of olfactory 

 nerve fibers, (2) the layer of glomerules, (3) the large nerve cells 



