The anatomy of the humane body / By W. Cheselden.

  • William Cheselden
Date:
1784
Catalogue details

Licence: Public Domain Mark

Credit: The anatomy of the humane body / By W. Cheselden. Source: Wellcome Collection.

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    and are ftrong fupports to the thin and flat parts of the fcull, which elfe would be exceeding weak. What remains of this bone belongs properly to a difcourfe on the organs of hearing. Between the laft-defcribed bones and the fol- lowing bone are two large holes, which are the eighth foramina. Through thefe holes pafs the eighth pair of nerves and. lateral finufes; fome- times they are two on each fide, one for the nerve and one for the finus. To thefe we may add ano- ther very fmall one on each fide, through which pafs the portiones durse of the auditory nerves $ and fometimes there is another for an artery. Os occipitis makes all the back part of the fcull : It is bounded by the fphenoidal, temporal* petrofal, and parietal bones; it has two fmall apo- phyfes, by which it is articulated to the fpine ; near thofe apophyfes are two fmall foramina, which are the ninth of the fcull; through thefe pafs the ninth pair of nerves; and between thefe is the great or tenth foramen, through which the me- dulla oblongata defcends into the fpine, the cervi- cal arteries enter, and the cervical veins pafs out.* In the infide of this bone is a crucial fpine im- preffed by the longitudinal and lateral finufes j and on the outfide, oppofite to the middle of this fpine, in fome bodies, is an apophyfis, and from that down to the great foramen a fmall thin fpine. The fpines in this bone are of the fame ufe with thofe in theos frontis,&c* viz. to ftrengthen it. The thinner
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