114 MEPULLA OBLONGATA. 



should still remain actively alive to all impressions, and 

 produce a variety of corresponding motions without volition 

 or any consciousness whatever. 



A step higher and we find these nervous columns of 

 the spinal marrow continued into or surmounted by the 

 Medulla OUongata. 



FIG. 16. 



FIG. 16. Base of the brain with its nerves. 



a Anterior fissure between hemispheres of the Brain. 6 Posterior fissure. 

 c Anterior lobes of Cerebrum, d Middle lobes, t Fissure of Sylvius. / 

 Posterior lobes of Cerebrum, g Point of Infundibulum. h Its body, i 

 Corpora Albicantia. j Cineritious matter, k Crura Cerebri. I Pons Va- 

 rolii. m Top of Medulla Oblongata. n Posterior prolongation of Pons 

 Varolii. o Middle of Cerebellum, p Anterior part of Cerebellum, q Its 

 Posterior fissure, r Superior part of Medulla Spinalis. s Middle fissure of 

 Medulla Oblongata. t Corpus Pyramidale. tt Corpus Restiforme. v Cor- 

 pus Olivare. w Olfactory Nerve, x Its bulb, y Its external root, z 

 Middle root, aa Internal root, bb Optic nerve beyond Chiasm. cc Optic 

 nerve before the Chiasm. dd Motor Occuli, or third pair of nerves, ee 

 Fourth pair or pathetic nerves, ff Fifth pair or Trigemini nerves, gg 

 Sixth pair or Motor Externus. hk Facial nerve, ii Seventh pair Qr Audi- 

 tory, including Facial, jj kk II Eighth pair of nerves ninth not seen. 



