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NORMAL HISTOLOGY. 



Cerebral 

 cortex 



Cerebrum <j Medulla. 



Ventricles. 



Brain invest- 

 ments . 



f Granular layer. 



Layer of small pyramidal cells. 

 <{ Layer of large pyramidal cells. 

 I Layer of irregular cells. 

 t Layer of fusiform cells. 



Medullated fibres. 

 Connective tissue. 



f Multipolar ganglion 

 Gray matter. 



White matter. 



Medullated fibres. 

 Medullated fibres. 

 Connective tissue. 



Dura mater. 

 Arachnoid membrane. 

 Pia mater. 



MEDULLA OBLONGATA. 



The structure of the medulla oblongata is virtually the same as 

 that of the spinal cord. The chief difference consists in the arrange- 

 ment of the structural elements. 



CEREBELLUM. 



The cerebellum consists of the cerebellar cortex and medulla. 



The cerebcllar cortex comprises three layers the molecular layer, 

 of Purkinji's cells, and granular layer. The molecular layer 

 is composed of large and small multipolar ganglion cells. The small 

 cells are disposed toward the surface. The large cortical cells are in 

 the deeper portion of the cortex and send out protoplasmic processes 

 toward the surface. Purkinji's cells are large, somewhat pear- 

 shaped ganglion cells, which send out two large protoplasmic proc- 

 esses from one pole of each cell into the molecular layer. The axis 

 cylinder proceeds from the opposite pole, becomes a medullated fibre, 

 and enters the white matter of the cerebellum. The granular layer 

 is the innermost, and is composed of large and small cells provi-M 

 with large nuclei. The whole layer presents a rusty appearance. 

 Each cell is provided with dendrites and a non-medullated nerve 

 process, which extends into the molecular layer. 



