Course of lectures on physiology / as delivered by Professor Küss at the Medical School of the University of Strasbourg ; edited by Mathias Duval ; translated from the second and revised edition by Robert Amory.

  • Küss, Émile, 1815-1871.
Date:
1876
Catalogue details

Licence: Public Domain Mark

Credit: Course of lectures on physiology / as delivered by Professor Küss at the Medical School of the University of Strasbourg ; edited by Mathias Duval ; translated from the second and revised edition by Robert Amory. Source: Wellcome Collection.

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    and others (mylo-hyoid and the anterior belly of the digas- tric) depress the jaw, perhaps, also, t© the stapedius and to the internal muscle of the malleus; but these last-named filaments appear to be mostly branches belonging to the facial, as well as to the secretory, filaments, which go to the sub- maxillary, sublingual (chorda tympani), and parotid glands. Summing up, it will be seen that the trifacial nerve essen- tially presides over the sensibility of the three grand divisions of the face (forehead, cheeks, and chin), whence the name trigeminus or trifacial. Facial Nerve (portio dura of the 7th pair). — This is essentially a centrifugal nerve (motory and secretory) ; the secretory functions devolve apparently on the intermediary nerve of Wrisberg (Cl. Bernard). The facial receives some sensory anastomoses which proceed to it from the pneumo- gastric and trifacial nerves. By its terminal branches this nerve presides over the movements of all the cutaneous {peauciers) muscles of the head, from the frontal to the occipital, comprising among these the buccinator, and even to the cutaneous muscle of the neck. Through its filaments, whose path is as compli- cated as the windings of the aqueduct of Fallopius, whose canal it follows, it presides over the secretion from the dif- ferent salivary glands, the contraction of the muscles con- cerned in the first intervals of deglutition (velum palati, styloid muscles, posterior belly of the digastric, etc.), as well as the contractions of the muscles of the middle ear (tensor tympani, or musculus internus mallei, and stapedius). Lon- get regards the branches given olf to these last two muscles as being the continuation of the intermediary of Wrisberg, which he names consequently motory tympanic nerve. By the above ])hysiological notions, it is explained why paralyses of the facial neiwe, arising from superficial causes, are characterized only by distortion of the features, whilst those from dee|i-seated causes involve, in addition, a certain difticulty of deglutition (deviation of the uvula, etc.) as well as of hearing. Auditory Nerve (portio mollis of the 7th pair). —This is the special nerve of the organ of hearing. Its irritation can only occasion sensation of sounds; its section is followed by complete deafness. Its partial section in exi)criinents on ani- mals cause movements of rotation (Flourens) that have been exj)lained as caused by a vertigo of the senses (Gratiolet, Vulpian).
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