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Z8600021: /* The Membranous Labyrinth */

2019-03-30T23:42:35Z

The Membranous Labyrinth

← Older revision		Revision as of 10:42, 31 March 2019
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	===The Membranous Labyrinth===		===The Membranous Labyrinth===

	(''labyrinthus membranaceus'') (Figs. 924, 925, 926)~~.—The~~ membranous labyrinth is lodged within the bony cavities just described, and has the same general form as these; it is, however, considerably smaller, and is partly separated from the bony walls by a quantity of fluid, the perilymph. In certain places it is fixed to the walls of the cavity. The membranous labyrinth contains fluid, the endolymph, and on its walls the ramifications of the acoustic nerve are distributed.		(''labyrinthus membranaceus'') (Figs. [[:File:Gray0924.jpg\|924]], [[:File:Gray0925.jpg\|925]], [[:File:Gray0926.jpg\|926]]) — The membranous labyrinth is lodged within the bony cavities just described, and has the same general form as these; it is, however, considerably smaller, and is partly separated from the bony walls by a quantity of fluid, the perilymph. In certain places it is fixed to the walls of the cavity. The membranous labyrinth contains fluid, the endolymph, and on its walls the ramifications of the acoustic nerve are distributed.

	Within the osseous vestibule the membranous labyrinth does not quite preserve the form of the bony cavity, but consists of two membranous sacs, the utricle, and the saccule.		Within the osseous vestibule the membranous labyrinth does not quite preserve the form of the bony cavity, but consists of two membranous sacs, the utricle, and the saccule.

	===The Utricle===		===The Utricle===
	(''utriculus'') The utricle, the larger of the two, is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. That portion which is lodged in the recess forms a sort of pouch or cul-de-sac, the floor and anterior wall of which are thickened, and form the macula acustica utriculi, which receives the utricular filaments of the acoustic nerve. The cavity of the utricle communicates behind with the semicircular ducts by five orifices. From its anterior wall is given off the ductus utriculosaccularis, which opens into the ductus endolymphaticus.		(''utriculus'') The utricle, the larger of the two, is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. That portion which is lodged in the recess forms a sort of pouch or cul-de-sac, the floor and anterior wall of which are thickened, and form the macula acustica utriculi, which receives the utricular filaments of the acoustic nerve. The cavity of the utricle communicates behind with the semicircular ducts by five orifices. From its anterior wall is given off the ductus utriculosaccularis, which opens into the ductus endolymphaticus.

Z8600021 at 05:24, 1 July 2016

2016-07-01T05:24:02Z

← Older revision		Revision as of 16:24, 1 July 2016
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	:'''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]]		:'''Links:''' [[Sensory - Balance Development\|Balance Development]] \| [[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}}		{{Gray Anatomy}}
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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:Balance]]

Z8600021 at 00:57, 30 Haziran 2014

2014-06-30T00:57:56Z

← Older revision		Revision as of 11:57, 30 Haziran 2014
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	===The Membranous Labyrinth===		===The Membranous Labyrinth===

	(labyrinthus membranaceus) (Figs. 924, 925, 926).—The membranous labyrinth is lodged within the bony cavities just described, and has the same general form as these; it is, however, considerably smaller, and is partly separated from the bony walls by a quantity of fluid, the perilymph. In certain places it is fixed to the walls of the cavity. The membranous labyrinth contains fluid, the endolymph, and on its walls the ramifications of the acoustic nerve are distributed.		(''labyrinthus membranaceus'') (Figs. 924, 925, 926).—The membranous labyrinth is lodged within the bony cavities just described, and has the same general form as these; it is, however, considerably smaller, and is partly separated from the bony walls by a quantity of fluid, the perilymph. In certain places it is fixed to the walls of the cavity. The membranous labyrinth contains fluid, the endolymph, and on its walls the ramifications of the acoustic nerve are distributed.

	Within the osseous vestibule the membranous labyrinth does not quite preserve the form of the bony cavity, but consists of two membranous sacs, the utricle, and the saccule.		Within the osseous vestibule the membranous labyrinth does not quite preserve the form of the bony cavity, but consists of two membranous sacs, the utricle, and the saccule.

	===The Utricle===		===The Utricle===
	(utriculus) The utricle, the larger of the two, is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. That portion which is lodged in the recess forms a sort of pouch or cul-de-sac, the floor and anterior wall of which are thickened, and form the macula acustica utriculi, which receives the utricular filaments of the acoustic nerve. The cavity of the utricle communicates behind with the semicircular ducts by five orifices. From its anterior wall is given off the ductus utriculosaccularis, which opens into the ductus endolymphaticus.		(''utriculus'') The utricle, the larger of the two, is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. That portion which is lodged in the recess forms a sort of pouch or cul-de-sac, the floor and anterior wall of which are thickened, and form the macula acustica utriculi, which receives the utricular filaments of the acoustic nerve. The cavity of the utricle communicates behind with the semicircular ducts by five orifices. From its anterior wall is given off the ductus utriculosaccularis, which opens into the ductus endolymphaticus.

	===The Saccule===		===The Saccule===
	(sacculus) The saccule is the smaller of the two vestibular sacs; it is globular in form, and lies in the recessus sphæricus near the opening of the scala vestibuli of the cochlea. Its anterior part exhibits an oval thickening, the macula acustica sacculi, to which are distributed the saccular filaments of the acoustic nerve. Its cavity does not directly communicate with that of the utricle. From the posterior wall a canal, the ductus endolymphaticus, is given off; this duct is joined by the ductus utriculosaccularis, and then passes along the aquæductus vestibuli and ends in a blind pouch (saccus endolymphaticus) on the posterior surface of the petrous portion of the temporal bone, where it is in contact with the dura mater. From the lower part of the saccule a short tube, the canalis reuniens of Hensen, passes downward and opens into the ductus cochlearis near its vestibular extremity (Fig. 924).		(''sacculus'') The saccule is the smaller of the two vestibular sacs; it is globular in form, and lies in the recessus sphæricus near the opening of the scala vestibuli of the cochlea. Its anterior part exhibits an oval thickening, the macula acustica sacculi, to which are distributed the saccular filaments of the acoustic nerve. Its cavity does not directly communicate with that of the utricle. From the posterior wall a canal, the ductus endolymphaticus, is given off; this duct is joined by the ductus utriculosaccularis, and then passes along the aquæductus vestibuli and ends in a blind pouch (saccus endolymphaticus) on the posterior surface of the petrous portion of the temporal bone, where it is in contact with the dura mater. From the lower part of the saccule a short tube, the canalis reuniens of Hensen, passes downward and opens into the ductus cochlearis near its vestibular extremity (Fig. 924).

	===The Semicircular Ducts===		===The Semicircular Ducts===
	(ductus semicirculares; membranous semicircular canals), (Figs. 925, 926).—The semicircular ducts are about one-fourth of the diameter of the osseous canals, but in number, shape, and general form they are precisely similar, and each presents at one end an ampulla. They open by five orifices into the utricle, one opening being common to the medial end of the superior and the upper end of the posterior duct. In the ampullæ the wall is thickened, and projects into the cavity as a fiddle-shaped, transversely placed elevation, the septum transversum, in which the nerves end.		(''ductus semicirculares''; membranous semicircular canals), (Figs. 925, 926).—The semicircular ducts are about one-fourth of the diameter of the osseous canals, but in number, shape, and general form they are precisely similar, and each presents at one end an ampulla. They open by five orifices into the utricle, one opening being common to the medial end of the superior and the upper end of the posterior duct. In the ampullæ the wall is thickened, and projects into the cavity as a fiddle-shaped, transversely placed elevation, the septum transversum, in which the nerves end.

	The utricle, saccule, and semicircular ducts are held in position by numerous fibrous bands which stretch across the space between them and the bony walls.		The utricle, saccule, and semicircular ducts are held in position by numerous fibrous bands which stretch across the space between them and the bony walls.

Z8600021 at 00:55, 30 Haziran 2014

2014-06-30T00:55:26Z

← Older revision		Revision as of 11:55, 30 Haziran 2014
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	==Inner Ear - The Membranous Labyrinth==		==Fig. 924. Inner Ear - The Membranous Labyrinth==

	===The Membranous Labyrinth===		===The Membranous Labyrinth===

Z8600021 at 18:59, 18 August 2012

2012-08-18T18:59:56Z

← Older revision		Revision as of 05:59, 19 August 2012
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			==Inner Ear - The Membranous Labyrinth==

			===The Membranous Labyrinth===

			(labyrinthus membranaceus) (Figs. 924, 925, 926).—The membranous labyrinth is lodged within the bony cavities just described, and has the same general form as these; it is, however, considerably smaller, and is partly separated from the bony walls by a quantity of fluid, the perilymph. In certain places it is fixed to the walls of the cavity. The membranous labyrinth contains fluid, the endolymph, and on its walls the ramifications of the acoustic nerve are distributed.

			Within the osseous vestibule the membranous labyrinth does not quite preserve the form of the bony cavity, but consists of two membranous sacs, the utricle, and the saccule.

			===The Utricle===
			(utriculus) The utricle, the larger of the two, is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. That portion which is lodged in the recess forms a sort of pouch or cul-de-sac, the floor and anterior wall of which are thickened, and form the macula acustica utriculi, which receives the utricular filaments of the acoustic nerve. The cavity of the utricle communicates behind with the semicircular ducts by five orifices. From its anterior wall is given off the ductus utriculosaccularis, which opens into the ductus endolymphaticus.

			===The Saccule===
			(sacculus) The saccule is the smaller of the two vestibular sacs; it is globular in form, and lies in the recessus sphæricus near the opening of the scala vestibuli of the cochlea. Its anterior part exhibits an oval thickening, the macula acustica sacculi, to which are distributed the saccular filaments of the acoustic nerve. Its cavity does not directly communicate with that of the utricle. From the posterior wall a canal, the ductus endolymphaticus, is given off; this duct is joined by the ductus utriculosaccularis, and then passes along the aquæductus vestibuli and ends in a blind pouch (saccus endolymphaticus) on the posterior surface of the petrous portion of the temporal bone, where it is in contact with the dura mater. From the lower part of the saccule a short tube, the canalis reuniens of Hensen, passes downward and opens into the ductus cochlearis near its vestibular extremity (Fig. 924).

			===The Semicircular Ducts===
			(ductus semicirculares; membranous semicircular canals), (Figs. 925, 926).—The semicircular ducts are about one-fourth of the diameter of the osseous canals, but in number, shape, and general form they are precisely similar, and each presents at one end an ampulla. They open by five orifices into the utricle, one opening being common to the medial end of the superior and the upper end of the posterior duct. In the ampullæ the wall is thickened, and projects into the cavity as a fiddle-shaped, transversely placed elevation, the septum transversum, in which the nerves end.

			The utricle, saccule, and semicircular ducts are held in position by numerous fibrous bands which stretch across the space between them and the bony walls.


			(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:Senses]] [[Category:Hearing]]

S8600021 at 14:49, 27 September 2009

2009-09-27T14:49:04Z

← 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 14:16, 27 September 2009

2009-09-27T14:16:03Z

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