. Physiologie humaine : conçu pour les collèges et les classes supérieures dans les écoles, et pour la lecture générale. NKRVOUS MALLES DANS L'HOMME. 144 PHYSIOLOGIE HUMAINE. Hémisphères et lobes du cerveau. Partie arrière : c est le grand nerf facial, le nerf principal de la face; la moelle épinière, d, envoie des branches sur l'un ou l'autre côté de sa longueur entière ; a e est le plexus brachial, un faisceau de nerfs corning de la moelle épinière, qui ici unitetogether, et sont ensuite distribués à toutes les parties du bras; à iis un plexus similaire dont sont distribués des nerfs à l'extrémité inférieure;/, #, et h point à ne différent

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. Human physiology : designed for colleges and the higher classes in schools, and for general reading. NKRVOUS TRUNKS IN MAN. 144 HUMAN PHYSIOLOGY. Hemispheres and lobes of the brain. back part: at c is the great facial nerve, the chief nerve of theface; the spinal marrow, d, sends off branches on either sidein its whole length ; at e is the brachial plexus, a bundle ofnerves corning from the spinal marrow, which here unitetogether, and are then distributed to all parts of the arm; at iis a similar plexus from which are distributed nerves to thelower extremity;/, #, and h point to different nerves in thearm, and I, m, n, and o to different nerves in the leg. Youobserve that the whole of this nervous system is divided intoexactly similar halves. The cerebrum and the cerebellum areboth double organs, and the nerves of one side are just likethose of the other. 229. Having thus observed the general arrangement of thenervous system, I call your attention next to the arrangementand structure of the brain which are seen in Fig. 13. This. _c h i k m e BUAIN AND NERVES. Figure presents to view a perpendicular section of the brain, asmade from front to rear, dividing it into two halves. Youhave here a view of the inner surface of one hemisphere, as it is THE NERVOUS SYSTEM. 145 Cerebrum. Cerebellum. Convolutions. Membranes. termed, of the cerebrum, the large upper brain, which is com-monly described as having three lobes or divisions, a, theanterior; b, the middle; and c the posterior. At / is thebroad band of white fibrous matter, which unites the twohalves or hemispheres together, of course divided in thesection ; at d is the cerebellum showing a peculiarly beautifularrangement, called the arbor vitce, or tree of life; at g is thebeginning of the optic nerve which goes to the eye; I is thenerve of smell; e is the commencement of the spinal marrow.The many nerves which you see, are distributed to variousparts of the face; the nerve at h goes to the tongue ; at i tothe throat

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