Lessons in elementary anatomy / by St. George Mivart.

  • St. George Jackson Mivart
Date:
1873
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary anatomy / by St. George Mivart. Source: Wellcome Collection.

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

    118/574 page 86
    85 [less. spoken of already as mediaiily dividing the posterior nasal openi^igs. In the infant this bone consists of two lateral portions. The inferior turbinate bones, or lowest TURBINALS, extend (one on each s^de) from before backwards along the nasal fossK, attached, though but slightly, to the inner side of the maxillary and palatine bones. 12. The only naturally separated bone of the skull in the adult, namely the lower jawbone, or mandible, consists ot a curved osseous band, almost of the same depth through- out, and convex forwards. It has a smooth rounded infenor edge, but its upper edge is festooned by unequal cavities, forming sockets for the teeth, whence this upper border IS termed alveolar. The whole band is termed the body of the mandible ; a vertical line at its middle in front is called the sy/np/iysis,^ and each half of the body external to this line is called the horizontal rmnus (or branch). At its hinder end each horizontal ramus turns suddenly upwards at a slightly obtuse angle, and terminates above in two processes, the front one of which is pointed and is called the corouoid process,'' while the hinder one ends in a rounded head, the condyle^' mounted on a narrower part termed the iteck.' This nearly vertical part on each side is called the ascend- ing ramus, and the point where its posterior margin meets the inferior margin of the horizontal ramus is named the angle. (Fig. 83.) The condyle is wider than it is long, and fits into the glenoid cavity of the scjuamous part of the temporal bone. An inter- articular fibro-cartilage (with one syno\ ial sac above it and one below it) is interposed between the two bones, and the ascending ramus is also attached to the skull by strong ligaments. The coronoid process rises nearly as high as the condvlc. and lias inseitcd into it the temporal mnsi lc which adheres, at its origin, to tlie side of the skull within the arcli of the zygoma. On the inner side of the ascending ramus is a foramen, called the inferior denial, and another, the mental foramen, is placed, more forwards, on the outer side of the horizontal ramus. The sym]Dhysis is concave \-crticall\- in front, the lower iDordcr of the m.iiKlihle |)|-()jecting at the symplix'sis to firm the chin. ' I'^ioiii (Ti'fKj'vfii, to grow logelhcr.
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