SENSORY GANGLIA. CONSENSUAL ACTIONS. 



327 



of parts whose function is altogether different, yet there seems no reason for 

 doubting that it has a character of its own, and that it is really the ganglionic 



[Fig. 157. 



A view of the base of the Cerebrum and Cerebellum, together with their nerves ; 1, anterior extremity 

 of the fissure of the hemispheres of the brain ; 2, posterior extremity of the same fissure ; 3, the anterior 

 lobes of the cerebrum ; 4, its middle lobe ; 5, the fissure of Sylvius ; 6, the posterior lobe of the cerebrum ; 

 7, the point of the infundibulum ; 8, its body ; 9, the corpora alhicamia; 10, cineritious matter ; 11, the 

 crura cerebri ; 12, the pons Varolii ; 13, the top of the medulla oblongata; 14. posterior prolongation of 

 the pons Varolii; 15, middle of the cerebellum ; 16, anterior part of the cerebellum; 17, its posterior part 

 and the fissure of its hemispheres ; 18, superior part of the medulla spinalis ; 19, middle fissure of the 

 medulla oblongata ; 20, the corpus pyramidale ; 21, the corpus restiforme ; 22, the corpus olivare ; 23, the 

 olfactory nerve ; 24, its bulb ; 25, its external root ; 26, its middle root ; 27, its internal root ; 29, the op- 

 tic nerve beyond the chiasm; 29, the oplic nerve before the chiasm; 30, the motor oculi, or third pair 

 of nerves ; 31, the fourth pair or pathetic nerves ; 32, the fifth pair, or trigernini nerves ; 33. the sixth 

 pair, or motor externus ; 34, the facial nerve ; 35. the auditory the two making the seventh pair ; 36, 

 37, 38, the eighth pair of nerves. (The ninth pair is not here seen .)] 



centre of the Auditory nerve. In like manner, we may probably fix upon a 

 collection of vesicular matter, imbedded in the Medulla Oblongata, which is 

 considered by Stilling to be the nucleus of the Glosso-pharyngeal nerve, and 

 to which a portion of the sensory root of the Fifth pair may be traced, as 

 representing the Gustatory ganglion. 



423. At the base of the Cerebral Hemispheres, we find two other large 

 ganglionic masses, on either side ; into which all the fibres appear to pass, 

 which connect the Hemispheres with the Medulla Oblongata. These are the 

 Thalami Optici, and the Corpora Striata. Now, although these are com- 

 monly regarded in the light of appendages, merely, to the Cerebral Hemi- 

 spheres, it is evident, from the large quantity of vesicular matter they contain, 

 that they have an independent character ; and that, even if the Cerebral fibres 

 simply pass through them, other fibres have their proper ganglionic centres 



