File:Diseases of the nervous system - a text-book of neurology and psychiatry (1915) (14596129308).jpg

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Identifier: diseasesofnervo00jell (find matches)
Title: Diseases of the nervous system : a text-book of neurology and psychiatry
Year: 1915 (1910s)
Authors: Jelliffe, Smith Ely, 1866-1945 White, William A. (William Alanson), 1870-1937
Subjects: Mental Disorders Nervous System Diseases
Publisher: Philadelphia : Lea & Febiger
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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er pulling the top of the tongueup or down. By asymmetrical innervation the anterior portion of thetongue is pushed to the paralyzed side. Any loss of the function ofthe branch which innervates the transverse muscles brings about anarrowing of the tongue, whereas symmetrical affection of the verticalmuscles produces a flattening of the tongue. The geniohyoid raisesthe hyoid bone, pulling it forward when the lower jaw is fixed, or pullsthe lower jaw down. When the hyoid bone is fixed the sternohyoidand the thyreohyoid pull on the hyoid bone. The nucleus of the hypoglossus lies in the lower two-thirds of themedulla, stretching as far down as the pyramidal crossing, ventrallyfrom the central canal to the midline. At least ten to fifteen root DISEASES OF THE HYPOGLOSSAL NERVES 235 bundles pass from the hypoglossal nuclei between the pyramidal tractsand the olive, and join together for a short distance within the hypo-glossal canal, at the orifice of which the hypoglossal vein, which is in
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Fig. 119.—Pathways of the taste fibers. I, ophthalmic branch of V, II, maxiUarybranch; III, mandibular branch; eg, cortical taste area; fg, central ascending tastefibers in median lemniscus; fg, subcortical paths; Gg, geniculate; Gsp, jugular andpetrosal ganglia of the glossopharyngeus; ta, central ascending fibers of trigemmus mmedian lemniscus; ta\ subcortical connections of the thalamus with the inferior posteriorcentral gyrus. (Bechterew.) 236 SENSORI-MOTOR NEUROLOGY—CRANIAL NERVES connection with the occipital sinus, surrounds it. The canal is narrowand short—less than half an inch—lying close to the occipito atlanticarticulation, at a place where fracture of the base of the skull is veryapt to affect it. At its exit from the skull the hypoglossal lies median to and dorsalof the vagus and of the internal jugular vein, proceeds laterally, passesbeneath the stylohyoid muscle and the posterior belly of the kigastric,splits into its various branches, and innervates the muscle

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30 July 2014
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