Volume 1

The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / by Chapin A. Harris.

  • Harris, Chapin A. (Chapin Aaron), 1806-1860.
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / by Chapin A. Harris. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    It occupies the lower part of the face, has a parabolic form, and extends backward to the base of the skull. It is divided into a body and extremities. The body is the middle and horizontal portion ; this is divided along its center by a ridge called the symphysis, which is the place of separation in the infant state ; the middle portion projects at its inferior part into an eminence called the mental process, or chin ; on each side of which is a depression for the muscles of the lower lip ; and exter- nally to these depressions are two foramina, called anterior mental, for transmitting an artery and nerve of the same name. The horizontal portions extend backward and outward, and on Fig. io. the outward surface have an oblique line for the attachment of muscles. On the inner surface of the middle part, behind the chin, along the line of the symphysis, there is a chain of eminences called genial tubercles, to the superior of which the frenum linguae is attached, to the middle the genio-hyo-glossi, and to the inferior the genio-hyoid muscles; on each side of these eminences are depressions for the sub- lingual glands; and beyond these depressions there runs an oblique ridge upward and outward, to the anterior part of which is attached the mylo-hyoid muscle, and to the posterior part, the superior con- strictor of the pharynx; this latter muscle is consequently involved more or less in the extraction of the last molar tooth. Below this line