File:Keith1902 fig036b.jpg - Revision history

Z8600021 at 03:53, 15 April 2018

2018-04-15T03:53:14Z

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	==Fig. 36 B A Section of the External Auditory Meatus at Birth==		==Fig. 36 B. Section of the External Auditory Meatus at Birth==

	(After Symington.)		(After Symington.)
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	[[Category:Neonatal]][[Category:Outer Ear]]		[[Category:Neonatal]][[Category:Outer Ear]]

Z8600021: /* Fig. 36 B A Section of the External Auditory Meatus at Birth */

2017-10-03T23:51:48Z

Fig. 36 B A Section of the External Auditory Meatus at Birth

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	[[Category:Neonatal]][[Category:Outer Ear]]		[[Category:Neonatal]][[Category:Outer Ear]]

Z8600021 at 02:43, 28 Haziran 2016

2016-06-28T02:43:47Z

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Z8600021 at 04:58, 18 Mayıs 2015

2015-05-18T04:58:39Z

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	==Fig. 36 B A Section of the External Auditory Meatus at Birth==		==Fig. 36 B A Section of the External Auditory Meatus at Birth==

			(After Symington.)


			The external auditory meatus is derived from the upper part of the first cleft depression. In the adult the meatus is 1.25 in. long ; at birth it is 0.33 of an inch, and is surrounded by fibro-cartilaginous and fibrous tissue. In the adult the tympanic ring grows outwards in the fibrous tissue, as we have already seen (page IV) to form the tympanic plate and the inner two thirds of the meatal floor. The squamous part of the temporal, which is developed over in its roof, also grows outwards and forms a thick, horizontal plate in the inner two-thirds of the meatal roof (Figs. [[:File:Keith1902 fig036a.jpg\|36 A]] and [[:File:Keith1902 fig036b.jpg\|36 B]]). Over the roof lies the third temporal convolution.


			The meatus is supplied in front by the nerve of the mandibular arch (auriculo-temporal branch). Why the vagus should supply it with a branch (Arnold's nerve) is obscure. The vagus is a visceral nerve and supplies the 3rd and 4th clefts by its superior and inferior laryngeal branches. In fishes a branch of the vagus passes backwards beneath the skin on each side and supplies the sense organs of the lateral line. Many regard the auricular branch of the vagus as a vestige of such a branch.


			In the newly-born child the membrana tympani is so obliquely set that its outer surface is almost in contact with the meatal floor. With the development in length of the meatus, it becomes more vertical in position. The meatus may be only partly developed or even absent, the upper part of the 1st cleft becoming completely closed like the lower part. In such a case there is commonly a corresponding absence of development of the middle and internal ear.


	~~(After Symington.)~~

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	{{Human embryology morphology 1902 footer}}		{{Human embryology morphology 1902 footer}}
			[[Category:Neonatal]]

Z8600021 at 10:00, 29 December 2013

2013-12-29T10:00:55Z

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			==Fig. 36 B A Section of the External Auditory Meatus at Birth==


			(After Symington.)

	{{Keith1902_4_figures}}		{{Keith1902_4_figures}}

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

Z8600021: {{Keith1902_4_figures}} {{Human embryology morphology 1902 footer}}

2013-12-29T09:59:40Z

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