A handbook of diseases of the nose and nasopharynx / by James B. Ball.

  • Ball, James B. (James Barry), 1849-1926.
Date:
1890
Catalogue details

Licence: Public Domain Mark

Credit: A handbook of diseases of the nose and nasopharynx / by James B. Ball. Source: Wellcome Collection.

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    of the palate forming an elevation just behind the posterior naris, the levator cushion. The tensor palati muscle, arising from the sphenoid bone, and the anterior lip of the cartilage of the Eustachian tube, hooks round the hamular process and joins the soft palate. By means of the soft palate the floor of the naso-pharynx is closed in phonation and deglutition. The levator and tensor muscles raise the palate and make it tense; the salpiugo-phaiyngeal folds on each side swell up and approach each other, and the contracted azygos uvulse muscle and a projection forwards of the posterior pharyngeal wall, due to contraction of the superior constrictor, complete the closure. The arteries of the naso-pharynx are derived from the external carotid, through branches of the ascending pha- ryngeal, the internal maxillary, and the facial. The veins terminate in the internal jugular. The lymphatics enter glands in the substance of the parotid, the retro-pharyngeal glands, and the deep cervical glands near the bifurcation of the common carotid. The sensory nerves are derived from the fifth, principally from the second division, with a few twigs from the third division. The motor nerves of the velum palati are derived from the third division of the fifth, which supplies the tensor palati through the otic ganglion, from the eleventh nerve, which supplies, through the pha- ryngeal branches of the vagus, the levator palati, azygos uvulae, palato-glossus, and palato-pharyngeus muscles. The levator palati is said also to receive a motor supply from the facial through Meckel's ganglion. 4. The Accessoet Sinuses. These are air spaces situated in the neighbouring bones and communicating with the nasal fossa. They are four in number on each side, viz., the maxillary, frontal, sphenoidal, and ethmoidal sinuses. With the exception of the maxillary, these sinuses are absent in early youth.