Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . up mentioned (the associating fibres ) serves to assist thedifferent spinal segments in the performance of all acts where a har-monious and simultaneouH action of several segments of the spinal cordIS demanded. 9. The two lateral halves of each segment of the spinal cord arenot totally distinct from each other, because a connecting band of thegray substance of the cord (the gray commissure), and also one ofwhite substance (the
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . up mentioned (the associating fibres ) serves to assist thedifferent spinal segments in the performance of all acts where a har-monious and simultaneouH action of several segments of the spinal cordIS demanded. 9. The two lateral halves of each segment of the spinal cord arenot totally distinct from each other, because a connecting band of thegray substance of the cord (the gray commissure), and also one ofwhite substance (the white commissure), bind them together. Thewhite commissure lies at the bottom of the anterior median fissure; thegray commissure fills the remaining space between the anterior andposterior median fissures (Fig. 30). 10. The anterior horns of the spinal gray matter contain cells oflarge size which are connected (1) with motor nerve fibres, joining eachspinal segment with the brain (somewhat indirectly), and (2) with thefibres of the anterior root of the spinal nerve (associated with the musclescontrolled by each segment). Thus these nerve cells are interposed be-. FiG. 30.—A Spinal Segment. The two roots of the spinal nerve are shown ; also the sensoryand motor fibres of which each is composed. tween the fibres which pass from the brain to the cord and those dis-tributed to the muscles, an arrangement Avhich permits of an automaticaction of the cord, irrespective of cerebral influences. The cells of the anterior horns appear to control also the nutritionof the muscles, connected with them by means of the nerve fibres. 11. The cells of the posterior horns and central portion of the spinalgray matter are probably connected more or less intimately with thefibres of the posterior or sensory roots of each sjnnal segment, andpossibly also with the p) of conduction of painful impressions to thebrain. They do not exert any apparent infiuence upon the nutrition ofthe parts associ
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