File:A text-book of physiology for medical students and physicians (1911) (14778474312).jpg

Identifier: textbookofphysio1911howe (find matches)
Title: A text-book of physiology for medical students and physicians
Year: 1911 (1910s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology
Publisher: Philadelphia, London, W.B. Saunders company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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that run in the lingual and chorda tympani nerves areassumed to pass to the ganglion by way of the great superficialpetrosal and Vidian nerves and the sphenopalatine ganglion,while those that are contained in the glossopharyngeal reach 288 SENSATIONS OF TASTE AND SMELL. 289 the same ganglion through the tympanic nerve, the small super-ficial petrosal, and the otic ganglion. A report by Cushing*of the results of removal of the Gasserian ganglion in thirteencases throws much doubt upon these views. This author madecareful examinations of the sense of taste, not only immediatelyafter the operation, but for a long period subsequently. Hestates that in no case was there any effect upon the sense of tastein the posterior third of the tongue. We may believe, therefore,that the taste fibers of this part arise immediately from the ganglion-cells in the petrosal ganglion and enter the brain with the roots ofthe nerve to terminate in its sensory nucleus in the medulla. I-^«tfos.SUfCT^VCltV(X\OT
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(vlpetrosum. KJ• Fig. 120.—Schema to show the course of the taste fibers from tongue to brain.—(Cushing.) The dotted lines represent the course as indicated by Cushings observations.The full black lines indicate the paths by which some authors have supposed that thesefibers enter the brain in the trigeminal nerve. Regarding the anterior two-thirds of the tongue, the lingual region,it was found that in some cases there was at first a loss of acuity oftaste or even an entire disappearance of the sense, but subsequentlyit returned. It would seem, therefore, that the loss of taste de-scribed after removal of the Gasserian ganglion is an incidentalresult the cause of which is not entirely clear. Cushing attributesit to a postoperative degeneration and swelling in the fibers of thelingual nerve, which affect the conductivity of the intermingledfibers of the chorda tympani. Since, however, there is no perma- * Cushing, Bulletin of the Johns Hopkins Hospital, 14, 71, 1903. Givesalso the

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