File:Gray0899.jpg - Revision history

Z8600021 at 00:34, 30 Haziran 2014

2014-06-30T00:34:31Z

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	==Section through hind-brain and auditory vesicles==		==Fig. 899. Section through hind-brain and auditory vesicles==

	Section through hind-brain and auditory vesicles of an embryo more advanced than that of [[:File:Gray0898.jpg\|Fig. 898]]. ~~(After~~ His.)		Section through hind-brain and auditory vesicles of an embryo more advanced than that of [[:File:Gray0898.jpg\|Fig. 898]]. {{His}}

Z8600021: /* Section through hind-brain and auditory vesicles */

2012-08-18T19:54:27Z

Section through hind-brain and auditory vesicles

← Older revision		Revision as of 06:54, 19 August 2012
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	==Section through hind-brain and auditory vesicles==		==Section through hind-brain and auditory vesicles==

	Section through hind-brain and auditory vesicles of an embryo more advanced than that of [[:File:~~Gray0899~~.jpg\|Fig. 898]]. (After His.)		Section through hind-brain and auditory vesicles of an embryo more advanced than that of [[:File:Gray0898.jpg\|Fig. 898]]. (After His.)

Z8600021 at 19:54, 18 August 2012

2012-08-18T19:54:08Z

← Older revision		Revision as of 06:54, 19 August 2012
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			==Section through hind-brain and auditory vesicles==

			Section through hind-brain and auditory vesicles of an embryo more advanced than that of [[:File:Gray0899.jpg\|Fig. 898]]. (After His.)


			===The Development of the Ear===

			The first rudiment of the internal ear appears shortly after that of the eye, in the form of a patch of thickened ectoderm, the auditory plate, over the region of the hind-brain. The auditory plate becomes depressed and converted into the auditory pit ([[:File:Gray0898.jpg\|Fig. 898]]). The mouth of the pit is then closed, and thus a shut sac, the auditory vesicle, is formed ([[:File:Gray0899.jpg\|Fig. 899]]); from it the epithelial lining of the membranous labyrinth is derived.

			The vesicle becomes pear-shaped, and the neck of the flask is obliterated ([[:File:Gray0900.jpg\|Fig. 900]]). From the vesicle certain diverticula are given off which form the various parts of the membranous labyrinth. One from the middle part forms the ductus and saccus endolymphaticus, another from the anterior end gradually elongates, and, forming a tube coiled on itself, becomes the cochlear duct, the vestibular extremity of which is subsequently constricted to form the canalis reuniens.

			Three others appear as disk-like evaginations on the surface of the vesicle; the central parts of the walls of the disks coalesce and disappear, while the peripheral portions persist to form the semicircular ducts; of these the superior is the first and the lateral the last to be completed ([[:File:Gray0902.jpg\|Fig. 902]]).

			The central part of the vesicle represents the membranous vestibule, and is subdivided by a constriction into a smaller ventral part, the saccule, and a larger dorsal and posterior part, the utricle. This subdivision is effected by a fold which extends deeply into the proximal part of the ductus endolymphaticus, with the result that the utricle and saccule ultimately communicate with each other by means of a Y-shaped canal. The saccule opens into the cochlear duct, through the canalis reuniens, and the semicircular ducts communicate with the utricle.

			(Text modified from Gray's 1918 Anatomy)

			:'''Links:''' [[Hearing_-_Inner_Ear_Development\|Inner Ear Development]] \| [[Sensory_-_Hearing_and_Balance_Development\|Hearing and Balance Development]] \| [[Anatomy_of_the_Human_Body_by_Henry_Gray\|Gray's 1918 Anatomy]]


			{{Gray Anatomy}}

	[[Category:Historic Embryology]] [[Category:Gray's 1918 Anatomy]] [[Category:Cartoon]]		[[Category:Historic Embryology]] [[Category:Gray's 1918 Anatomy]] [[Category:Cartoon]]
	[[Category:Senses]] [[Category:Hearing]] [[Category:Placode]]		[[Category:Senses]] [[Category:Hearing]] [[Category:Placode]]

S8600021 at 03:33, 21 Haziran 2010

2010-06-21T03:33:09Z

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	[[Category:Historic Embryology]] [[Category:Gray's 1918 Anatomy]] [[Category:Cartoon]]		[[Category:Historic Embryology]] [[Category:Gray's 1918 Anatomy]] [[Category:Cartoon]]
	[[Category:Senses]] [[Category:Hearing]]		[[Category:Senses]] [[Category:Hearing]] [[Category:Placode]]

S8600021 at 14:49, 27 September 2009

2009-09-27T14:49:46Z

← Older revision	Revision as of 01:49, 28 September 2009
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		[[Category:Historic Embryology]] [[Category:Gray's 1918 Anatomy]] [[Category:Cartoon]]
		[[Category:Senses]] [[Category:Hearing]]

S8600021 at 14:13, 27 September 2009

2009-09-27T14:13:07Z

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