Early adventures in Persia, Susiana, and Babylonia, including a residence among the Bakhtiyari and other wild tribes before the discovery of Nineveh . l system, whichcontrols both voluntary and involuntary acts,and the much smaller automatic system, whichis only concerned with pure reflexes, such as theactivity of the glands and the contraction of thepupil of the eye in bright sunlight. The cellsof the central system are situated in the brainand the spinal cord, those of the autonomicsystem are arranged in groups which lie alongboth sides of the vertebral column and nearcertain nerves of the b
Early adventures in Persia, Susiana, and Babylonia, including a residence among the Bakhtiyari and other wild tribes before the discovery of Nineveh . l system, whichcontrols both voluntary and involuntary acts,and the much smaller automatic system, whichis only concerned with pure reflexes, such as theactivity of the glands and the contraction of thepupil of the eye in bright sunlight. The cellsof the central system are situated in the brainand the spinal cord, those of the autonomicsystem are arranged in groups which lie alongboth sides of the vertebral column and nearcertain nerves of the brain ; the two systems areconnected by strands of fibres which pass atintervals between them. In both systems the cells which carry out acommon purpose are grouped together into nerve centres. The central nervous system consists structurallyof six parts : (i) the spinal cord ; (2) the bulbor medulla oblongata ; (3) the cerebellum or the FUNCTION OF NERVOUS SYSTEM 103 smaller brain ; (4) the pons or bridge which con-nects the smaller brain with the rest of thenervous system ; (5) the mid brain ; and (6) thecerebrum or greater brain (see Fig. 4).. Fig. 4.—Plan in outline of brain as seen from the right side. A,cerebrum ; B, cerebellum ; C, pons ; D, medulla oblongata. AfterQuains Anatomy (Sir E. Sharpey Schafer). Longmans, Green & Co. It would take us far beyond the scope of thisbook to describe the functions of these differentparts in any detail, but we may summarise themas follows :— (i) The cells of the spinal cord control thereflex movements of the limbs and the trunk. (2) Those of the bulb, the pons and the mid-brain regulate breathing, heart-beating and otherreflexes which are essential for our well-being. I04 THE EDUCATION OF BEHAVIOUR (3) Those of the cerebellum are concernedwith the co-ordination of muscular movements,and more particularly with the harmonious ad-justment of the working of the muscles whichmaintain the body in a position of equilibrium. (4) Those of t
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