45 



203. Model of the human brain, natural size. 



Exhibited by R. M. Cameron and Son. 1879. 



The upper halves of both hemispheres are movable ; the left to 

 the level of the upper surface of the corpus callosum so as to 

 demonstrate the arrangement of its fibres, the right as far as the 

 cavity of the lateral ventricle, the descending cornu of which 

 with its contained hippocampus minor may be exposed by re- 

 moving a small block lower down, or a somewhat larger piece on 

 the left side. The two halves of the medulla oblongata, pons 

 Varolii, and cerebellum are separately movable, and on the cut 

 surface of the last may be seen the arbor vitse. The various 

 structures on the base of the brain and the roots of the spinal 

 nerves are shown. 



204. Model of the brain, natural size, showing the 

 basal surface. 



From the Pedagogical Museum, St. Petersburg. 

 E. 665. 1877. 



The medulla oblongata, pons Varolii, pituitary body, and the 

 origins of the cranial nerves are shown. 



205. Model of the brain, natural size, in vertical 

 section. 



From the Pedagogical Museum, St. Petersburg. 

 E. 664. 1877. 



The corpus callosum, lateral ventricle with the optic thalamus, 

 the pineal body, cerebellum, and pons Varolii are shown. 



206. Model of the spinal cord and cerebellum, natural 

 size. 



Made by Montaudon (late Dr. Auzoux), Paris. 

 E. 11. 1881. 



The origins of the dorsal and ventral nerve -roots and their 

 union to form the nerve-trunk are shown, as well as the brachial, 

 lumbar, and sacral plexuses. 



207. Model of the spinal cord and cerebellum. 



From the Pedagogical Museum, St. Petersburg* 

 E. 666. 1877. 



Somewhat similar to No. 206 but showing less detail. 



o 67986. D 



