Download PDF by E. E. Hewer and G. M. Sandes (Auth.): An Introduction to the Study of the Nervous System

By E. E. Hewer and G. M. Sandes (Auth.)

ISBN-10: 1483167712

ISBN-13: 9781483167718

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Extra info for An Introduction to the Study of the Nervous System

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Corticothalamic fibres, from cerebral cortex to thalamus. These three groups of fibres constitute the corona radiata. (b) Genu. ) Some of the motor fibres from the pre-Rolandic cerebral cortex. (c) Posterior Limb. ) Remainder of the motor fibres from the pre-Rolandic cerebral cortex. ) Fibres from pre-Rolandic cerebral cortex to red nucleus (Monakow). ) Last neurone on auditory path passing to temporal cortex, and on visual path passing to occipital cortex. Thus the anterior part of the anterior limb and the posterior part of the posterior limb contain corticopetal (sensory) fibres, the genu and anterior twothirds of the posterior limb containing corticofugal (motor) fibres.

Diagram to show Origin of Sixth Nerve. —Diagram to show Origin of Motor Part of Seventh Nerve. —Diagram to show Path of Fibres of Cochlear Division of Eighth Nerve. —Pass backwards towards the mid-line and arch over the nucleus of the sixth nerve, making the rounded elevation on the floor of the fourth ventricle (eminentia teres or colliculus facialis). T h e fibres then emerge ventrally, passing between the nucleus of the seventh nerve and the substantia gelatinosa and appearing at the inferior border of the pons.

Cells of origin—main (dorsal) nucleus of 10 (nucleus intercalatus). Pre-ganglionic fibres pass in vagus, ending in cells lying in the organs supplied (see below). ). AUTONOMIC NERVOUS SYSTEM 43 Autonomic Supply of Certain Special Structures. Many structures have both a sympathetic and a parasympathetic supply ; some of the more important are summarised below, the function assigned being in all cases carried out by the post-ganglionic fibres. i. (other than rectum). In general the vagus increases the tone of the muscle, and promotes peristalsis ; it is also secretomotor to the glands.

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An Introduction to the Study of the Nervous System by E. E. Hewer and G. M. Sandes (Auth.)


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