Animal physiology / by John G. M'Kendrick.

  • John Gray McKendrick
Date:
1877
Catalogue details

Licence: Public Domain Mark

Credit: Animal physiology / by John G. M'Kendrick. Source: Wellcome Collection.

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    onal prisms (fig. 53, ^, and fig. 54); and the fang or root is protected by a layer of a material resembling bone, called crusta pMrosa or cement (fig. 53, c). In the centre of each Fig. 53.—Vertical Section through a Fig. 54-—surface of enamel prisms; Tooth lodged in its socket: a, enamel; ^, two prisms isolated. h, dentine; c, crusta petrosa or ce- ment ; d, lining of the cavity in the gum; e, bony socket in gum; f, pulp-cavity. tooth there is a cavity containing a pulpy matter, in which are nerves and blood-vessels (fig. 53,/). 79. Nei'ves of the Tongue,—These are : (l) the Hypoglossal^ the motor nerve of the tongue ; (2) the lingual branch of the fifth, con- ferring sensibility to touch to the anterior two-thirds of the tongue ; (3) the glosso-pharyngeal, conferring sensibility both as to touch and taste to the posterior third ; and (4) the chorda tympani, a branch of the facial, which confers the sense of taste on the tip of the tongue. INSALIVATION. 80. Insalivation is effected by the admixture of the secre- tions of three pairs of salivary glands (the parotids, the sub-maxillaries, and the sub-linguals), and of the mucus secreted by numerous small glands beneath the lining of
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