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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    arises from the cartilage of the wing of the nose, and is inserted into the integument near its margin. The Compressor JVaris, triangular in form, arises from the superior maxilla, a little above and external to the incisive fossa, and is attached to the fibro-cartilage of the nose, joining at the median line with its fellow of the opposite side. The Compressor Narium Minor extends from the alar cartilage to the integument of the end of the nose. The Depressor Alec Nasi arises from the incisive fossa of the su- perior maxilla, and, dividing into two sets of fibres, ascending and descending, is inserted into the septum and posterior portion of nasal cartilage, and by some fibres of the latter into the back part of the orbicularis oris. The facial nerve supplies all the muscles of this group. Their respective actions are sufficiently explained by their names, except the pyramidalis, which draws down the inner angle of the eye- brow, and perhaps aids in dilating the nostril, and the compressores nasi, whose action is directly opposite to that implied by their names. The contraction of the levator labii superioris alaeque nasi gives to the face the expression of contempt. 2. Superior Maxillary Group. Levator Labii Superioris Proprius. Levator Anguli Oris. Zygomaticus Major. Zygomaticus Minor. The Levator Labii Superioris Proprius, arises from the lower margin of the orbit, some of its fibres from the superior maxillary, others from the malar bone; they pass down to be inserted in the fleshy part of the upper lip. The Levator Anguli Oris arises from the canine fossa, just below the infra-orbital foramen, and descends to the angle of the mouth, where it blends with the orbicularis oris, the zygomatici, and the depressor anguli oris muscles. The Zygomaticus Major is a delicate fasciculus, arising from the malar bone, and finding attachment to the orbicularis and depressor anguli oris at the angle of the mouth. The Zygomaticus Minor arises from the malar bone, just behind the maxillary suture, and passes downward and inward, to be inserted in the outer margin of the levator labii superioris, with which it is continuous. These muscles are also supplied by the facial nerve. The action of the levator muscles is described in their names. The zygomatici draw the lip upward and outward, as in laughing.