Outlines of human osteology / by F.O. Ward.

  • Frederick Oldfield Ward
Date:
1876
Catalogue details

Licence: Public Domain Mark

Credit: Outlines of human osteology / by F.O. Ward. Source: Wellcome Collection.

    57/392 page 39
    ••mce of the meatus audtforins cvtrrnns, a canal leading a chamber in the petrous iDrocess, called the tympanum. This oridce hes between the mastoid process and the o-lenoid eavitv : its lower margin is rough for the attach- meat of the cartilage of the ear, and formed by a curved plate of bone common to it and the glenoid cavity ; its upper marsjin is generally smooth and rounded. The description of the canal itself will be included in that of the ear. (144-) Surfaces. Anterior. Continuous with the interior surface of the sc^uamous portion ; to which it is joined by a sort of suture, that remains distinct even in old age. and indicates the original separation of these two portions of the bone. It is marked with cerebral impres- sions, belongs to the middle fossa of the cranium, and pre.?ents ia I'ront a small shallow //roofe, leading back- ward to an aperture called the hiatus FallopU; which opens into a canal called the aqueducfus Fallopii. (164) The groove, which is sometimes double, lodges a nerve* and a small artery, which enter the aperture, and pass aloncr the canal. Just in front of it this surface presents a notch or deficiency; so that the carotid canal which lies immediately below, is here, as it were, unroofed. Above this notch there is a depression, generally shallow, but sometimes deep and distinct, for the reception of a nervous ganglion.f Lastly, above and behind the hiatus Fallopii, this surface presents an eminence, which indicates the position of the superior semicircular canal. (l-'vv) I'onlerior. Continuous with the interior surface of the mastoid yKjrtion, marked ^vith cerebral impressions, and belonging to the po.sterior fossa of the cranium. It preaentH, nearly in the centre, the smooth rounded orifice o( the me'ilnn ai'.ditorius internns; (164) and behind this a little .slit, covered by a triangular plate of bone, and forming the expanded orifice of a minute caTial, called the O'jHi-dwJH-f rentihidi. {\-A) Between thesf; two apertures, brit on a •^omew)iat higher level, there is a little dejiression of vfiriabie form anrl si/.c, which givers uttachnient to a slip of fibrouM membrane* and transmitH a little vein mio the caricellouH ti.«Hiie of the bone. ]iiO i-iur. An uneven complex surface, which forrn.s p;irt, oi llii' b;isc oi the cranitjm, and presenta, pa.ssing from tin: summit towards * C'ratiinl britjrli '.f vidifin ii':r%'''. t Oasscriarj gniiglion of Olli ucrv:. X Dnm miitor.
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