322 



HITCHCOCK'S ANATOMY 



ganglia, the most important of which are the Thalami Optici, 

 Corpora Striata, Olfactive Ganglia, and Tubercula Quadrige- 



mma. 



Fig. 308. 



572. Spinal Cord, — Upon the an- 

 terior portion of the Cerebellum, 

 commences the Spinal Cord, the up- 

 per portion of which, situated within 

 the skull, is about three inches in 

 length and one in breadth, and is 

 called the Medulla Oblongata. 



573. Cerebro-Spinal Center . — - 



These portions of the nervous sys- 

 tem constitute what is known as the 

 Cerebro-Spinal Axis or Center, and 

 are all made up of two kinds of mat- 



The Cerebro-Spinal Axis seen Anteriorly. The 

 Nerves have been cut through at a short distance 

 from their Origin or central termination, a, The 

 Cerebrum. &, Anterior Lobe of the Left Hemisphere 

 of the Brain, c, Middle Lobe. c7, Posterior Lobe, al- 

 most concealed by the Cerebellum, e, The Cerebel- 

 lum, f, The Medulla Oblongata or Bulb. 1, First, or 

 Olfactory Pair of Nerves. 2, Second Pair, or Optic. 

 3, Third Pair, or Motores Oculorum. 4, Fourth Pair, 

 or Pathetic. 5, The Facial, or Fifth Pair. 6, Sixth 

 Pair, or Abducentes. 7, Nerves of the Seventh Pair, 

 or Facial; also the Acousiic, or Portio Mollis, by 

 some called the Auditory, and viewed as a division 

 of the Seventh ; others call them the Eighth Pair. 

 9, The Glosso-Pharyngeal Nerves, called the Ninth 

 Pair by some, by others the Anterior Division of the 

 Eighth Pair. 10, The Pneumogastric, by some in- 

 cluded in the Eighth Pair, by others called the Tenth 

 Pair. 11, Nerves of the Eleventh and Twelfth Pairs, 

 the first being viewed by some as a Division of the 

 0 Eighth Pair, and called Spinal Accessory; the latter, 



called by some the Ninth, by others the Twelfth, is 

 the Motor Nerve of the Tongue. 13, Nerves of the Thirteenth Pair, or Sub-Occipital. 14, 

 15, 16, The First, Second, and Third Pairs of Cervical Nerves, g, Cervical Nerves form- 

 ing the Brachial Plexus. 25, One of the Pairs of Nerves of the Dorsal Portion of tin 

 Spinal Marrow. 33, One of the Pairs of Lumbar Nerves, h. Lumbar and Sacral Nervcg 

 forming the Plexus whence come the Nerves of the Lower Extremities, i and j, Ter 

 mination of the Spinal Marrow, called Cauda Equina, fc, Great Sciatic Nerve proceed-, 

 ing to the Lower Extremities. 



572. What is the medulla oblongata ? 573. What two kinds of matter does a slicing of 

 the brain show, and how is the gray and white matter disposed? 



