File:Physiology - a manual for students and practitioners (1892) (14592263090).jpg

Identifier: physiologymanual00mann (find matches)
Title: Physiology : a manual for students and practitioners
Year: 1892 (1890s)
Authors: Manning, Frederick A
Subjects: Physiology
Publisher: Philadelphia : Lea Brothers
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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diseased, the face of that side isdevoid of motion (Fig. 40), and becomes smooth and expression-less, while the sound side is held in its customary pose. Theeyelids cannot close themselves, and the lips do not oppose properly,on account of the defective action of the orbicular muscle. Thereis difficulty in drinking and in articulation for the same reason. State what influence is ascribed to the chorda tympani branch. The chorda tympani is a small filament given off from the facialin the aqueduct of Fallopius, some of whose fibres are distributed tothe submaxillary gland. If this nerve be divided, the secretion ofsaliva from the gland is greatly diminished, while stimulation of the THE CRANIAI> NEKVKS. 139 norvo will excite a copious flow. This is an active secretion, ami isnut a sinipli filtration clue to vaso-uiotor chanfrcs. A similar influ-ence is noted in the corresponding hall of the tongue. There is asimilar distribution of tibres from the facial to the parotid gland Fig. 40.
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Facial Paralysis of the Right Side. through the lesser petrosal nerve, but their action has not been sothoroughly analyzed as in the case of the submaxillary and chordatynipani. The chorda tympani has still further an effect upon the sense oftaste in the anterior portion of the tongue. If it be divided, thetaste is much blunted on the affected ,side. It is not known if thisbe due to the communication of the glosso-phaivngeal or not, butit seems probable that it cannot be ascribed to either the trifacialor facial alone ; and it is considered to be a plausible explanationtliat the chorda tympani does bear some fibres of the glosso-pharyngeal. 140 NERVOUS SYSTEM. Why is not the ocular paralysis of the seventh nerve as serious asthat of the fifth ? The eyelids remain open in facial paralysis, and the conjunctivais subject to injury by drying.and by foreign bodies ; but the injuryis not so great as in paralysis of the fifth nerve, because the seventhhas no trophic influence. What is the or

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