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

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

ISBN-10: 1483167712

ISBN-13: 9781483167718

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See Diagram 19·) TROCHLEAR THE S T U D Y OF THE NERVOUS 20 5. SYSTEM TRIGEMINAL (mixed motor and sensory). A . Motor Part. Cells of Origin. (a) Main motor nucleus. Upper pons. (β) Accessory motor nucleus. Mid-brain. This is a long, narrow nucleus of unipolar cells extending from the superior corpora quadrigemina to the level of the main motor nucleus. —Emerge at the side of the pons where the sensory fibres enter, and passing deep to the Gasserian ganglion, join the third (mandibular or inferior) division of the fifth nerve.

4. Inner fibre lamina (or molecular layer), nerve fibres. 5. Inner cell lamina, polymorphic nerve cells, usually stellate. Certain variations in these layers occur in different parts of the cerebral cortex, the following being the most important:— (a) Frontal and parietal areas (great association areas). The outer cell layer is very thick, varying directly with the mental capacity of the individual. (b) Pre-Rolandic area (motor area). The inner fibre layer contains the giant pyramidal cells, or Betz cells, whose axons give rise to the pyramidal tracts.

1 to L . 2 pass out to the sympathetic chain of ganglia, running either up or down, some connecting with these ganglia and others passing through the chain and running out to make connections with outlying ganglia. to the erector pili muscles, inhibitory fibres to the muscles of the bronchioles, oesophagus, stomach, intestine and bladder, motor fibres to the cardiac, ileocolic and anal sphincters, accelerator fibres to the heart, both motor and inhibitor fibres to the uterus, ureters, Fallopian tube and vas deferens.

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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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