Z8600021 at 07:14, 18 Mayıs 2015

2015-05-18T07:14:19Z

← Older revision		Revision as of 18:14, 18 Mayıs 2015
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	==Fig. 43 Showing the outer aspect of the Petro-mastoid at birth after the Squamosal is removed==		==Fig. 43 Showing the outer aspect of the Petro-mastoid at birth after the Squamosal is removed==


			There is a great individual variation, however, in the thickness of its outer wall. The antrum lies above and behind the level of the external auditory meatus ; the post-auditory spine and suprameatal triangle formed by the post-auditory part of the squamosal lie over it and serve as surface guides to it. The antrum opens in front into the attic of the tympanum. The tegmen tympani ([[:File:Keith1902 fig042.jpg\|Fig. 42]]) forms its roof and the petro-mastoid its floor and inner wall. The aqueductus Fallopii runs down the inner wall of its mouth ([[:File:Keith1902 fig043.jpg\|Fig. 43]]), and in its inner wall is situate the external semicircular canal. The petro-squamous suture in its roof ([[:File:Keith1902 fig042.jpg\|Fig. 42]]), and the masto-squamous suture on its outer wall (Fig. 14 B), become closed in the second year, and thus the escape of pus from it is rendered more difficult.



	{{Keith1902_4_figures}}		{{Keith1902_4_figures}}

	{{Human embryology morphology 1902 footer}}		{{Human embryology morphology 1902 footer}}

Z8600021: ==Fig. 43 Showing the outer aspect of the Petro-mastoid at birth after the Squamosal is removed== {{Keith1902_4_figures}} {{Human embryology morphology 1902 footer}}

2013-12-29T16:41:53Z

==Fig. 43 Showing the outer aspect of the Petro-mastoid at birth after the Squamosal is removed== {{Keith1902_4_figures}} {{Human embryology morphology 1902 footer}}

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==Fig. 43 Showing the outer aspect of the Petro-mastoid at birth after the Squamosal is removed==

{{Keith1902_4_figures}}

{{Human embryology morphology 1902 footer}}

File:Keith1902 fig043.jpg - Revision history

Z8600021 at 07:14, 18 Mayıs 2015

Z8600021: ==Fig. 43 Showing the outer aspect of the Petro-mastoid at birth after the Squamosal is removed== {{Keith1902_4_figures}} {{Human embryology morphology 1902 footer}}