A treatise on the human ear, with new views on the physiology of the tympanum / [Joseph William Moses].

  • Moses, Joseph William.
Date:
1847
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the human ear, with new views on the physiology of the tympanum / [Joseph William Moses]. Source: Wellcome Collection.

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    branches, a lower and an upper. The lower branch gives first twigs to the Eustachian tube, and then passes out of the cavity of the tympanum into the carotid canal, through a passage in the bone, where it anastomoses with the sympathetic. The upper branch, the continuation of the nerve, gives a twig to the secondary membrana tympani. According to Varrentrapp, there arises from it, by two roots—a twig, which runs in the inner wall of the cavity of the tympanum, then into the Eustachian tube, the cartilage of which it penetrates anteriorly, and at last loses itself in the mucous glands around its guttural orifice. A little higher up a third branch goes to the vestibular fenestra, and, according to Lauth, the tympanic nerve receives, immediately on its entrance into the canal in the upper part of the petrous bone, a filament from the fascial nerve. Moreover, the tympanic nerve receives a filament of communication from the external branch of the nervus caroticus the anterior and stronger branch of the first cervical ganglion of the sympathetic. From the otic gangliona nerve goes to the internal muscle of the malleus, ramus ad tensorem tympani. It arises from the upper and posterior part of the ganglion, and runs backwards on the inner side of the middle meningeal artery to the muscle. The auricle and auditory passage derive their nerves from the cervical plexus, from the fascial, from the third branch of the 5th and from the pneumogastric. The nerve from the cervical plexus is the great auricular nerve, and is distributed to the external parts of the auricle. The fascial nerve on its exit from the stylo mastoid hole, gives off the posterior auricular nerve, which receives a twig from the pneumogastric. The temporal branches of the fascial nerve send filaments to the skin of the anterior part of the auricle, and to its anterior and superior muscles. The superficial temporal nerve, a branch of the posterior and inferior fasciculus of the third division of the 5th, gives off two branches, nervi meatus auditorei externi, inferior et superior, the ramifications of which are distributed to the integument of the auditory passage and concha. There is one branch, nervus tym¬ pani, which runs under the upper wall of the osseous auditory passage to the membrana tympani, between the layers of which it glides and separates into very delicate filaments, by one or two of which it anastomoses with the chorda tympani. I shall make but few remarks on the physiology of the tym¬ panum as taught in the anatomical schools of the present day.
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