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116:. Linear accelerations (such as that of gravity) should not in theory effect a movement of the cupula when it is neutrally buoyant. The Buoyancy Hypothesis assumes that alcohol, with a different specific gravity from that of the cupula/endolymph, diffuses at different rates into the cupula and the surrounding endolymph. The result is a temporary density gradient between the cupula and endolymph, and a consequent (erroneous) sensitivity to linear accelerations such as that of gravity by a system normally signalling rotational accelerations. This sensation is commonly referred to as "the spins" .
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continual rotation however, the endolymph's acceleration normalizes with the rate of rotation of the semicircular ducts. As a result, the cupula returns to its resting position and the hair cells cease to be stimulated. This continues until the head stops rotating which simultaneously halts semicircular duct rotation. Due to inertia, however, the endolymph continues on. As the endolymph continues to move, the cupula is once again deflected resulting in the compensatory movements of the body when spun.
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filling the semicircular ducts initially lags behind due to inertia. As a result, the cupula is deflected opposite the direction of head movement. As the endolymph pushes the cupula, the stereocilia is bent as well, stimulating the hair cells within the crista ampullaris. After a short time of
55:, the cupula has embedded within it hair cells that have several stereocilia associated with each kinocilium. The cupula itself is the gelatinous component of the crista ampullaris that extends from the crista to the roof of the ampullae. When the head rotates, the
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79:, respectively. When the endolymph moves in the opposite direction, the direction of stimulation is reversed accordingly, from depolarization to hyperpolarization or vice versa. The corresponding signal is transmitted to the brain by the
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201:"VEDA – Vestibular Disorders Association – Sensory Input." VEDA – Vestibular Disorders Association – Vestibular Disorders Home. Web. 09 Dec. 2011. <
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In their natural orientation within the head, the cupulae are located on the medial aspect of the semicircular canals. In this orientation, the
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https://web.archive.org/web/20070703152544/http://education.vetmed.vt.edu/curriculum/VM8054/Labs/Lab11/Ear/EXAMPLES/Excrista.htm
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Saladin, Kenneth S. Anatomy & Physiology: the Unity of Form and
Function. New York, NY: McGraw-Hill, 2012. Print.
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Mann, Michael D. "Vestibular System." The
Nervous System In Action. 2007. Web. 8 Dec. 2011. <
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https://web.archive.org/web/20111126234002/http://www.unmc.edu/physiology/Mann/index.html
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by affecting the neutral buoyancy of the cupula within the surrounding fluid called the
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Knowledge articles incorporating text from the 20th edition of Gray's
Anatomy (1918)
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Short-term effects of alcohol consumption § Alcohol consumption and balance
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The cupula is the onion shaped structure surrounded by endolymph in the ampulla.
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http://www.anatomyatlases.org/MicroscopicAnatomy/Section16/Plate16314.shtml
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http://www.kumc.edu/instruction/medicine/anatomy/histoweb/eye_ear/ear04.htm
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Vertigo It's
Multisensory Syndromes Second Edition Thomas Brandt Chapter 17
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http://www.vestibular.org/vestibular-disorders/balance/sensory-input.php
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158:"Chapter 10: Vestibular System: Structure and Function"
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http://faculty.une.edu/com/abell/histo/CristaAmp.jpg
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90:rest on the posterior aspect of the cupula.
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130:This article incorporates text in the
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43:The cupula is located within the
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654:Reissner's/vestibular membrane
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397:promontory of tympanic cavity
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387:secondary tympanic membrane
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63:With each rotation, the
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81:vestibulocochlear nerve
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403:Posterior structures
98:Further information:
47:of each of the three
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644:Cochlear duct /
608:Perilymphatic space
508:Auditory tube /
826:Semicircular canals
799:Vestibular aqueduct
106:Buoyancy Hypothesis
49:semicircular canals
38:spatial orientation
804:endolymphatic duct
792:Otolithic membrane
705:Tectorial membrane
664:Reticular membrane
469:posterior ligament
417:pyramidal eminence
373:Medial structures
94:Effects of alcohol
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922:Vestibular system
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809:endolymphatic sac
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617:Cochlear aqueduct
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464:superior ligament
452:anterior ligament
442:superior ligament
330:Auricular muscles
313:intertragic notch
73:hyperpolarization
53:crista ampullaris
34:vestibular system
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659:Basilar membrane
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693:stereocilia
646:scala media
587:Helicotrema
377:oval window
266:Anatomy of
83:(CN VIII).
906:Categories
844:Horizontal
782:Kinocilium
547:membranous
540:Labyrinths
357:Middle ear
308:antitragus
120:References
65:hair cells
839:Posterior
750:Vestibule
698:tip links
671:Endolymph
632:Boettcher
612:Perilymph
532:Inner ear
491:stapedius
325:Ear canal
298:antihelix
280:Outer ear
136:page 1051
114:endolymph
88:kinocilia
77:kinocilia
57:endolymph
854:Ampullae
834:Superior
720:internus
715:externus
627:Claudius
597:Modiolus
487:Muscles
429:Ossicles
168:7 August
162:UTHealth
45:ampullae
896:Anatomy
787:Otolith
770:Saccule
758:Utricle
577:Cochlea
570:General
437:Malleus
335:Eardrum
318:earlobe
288:Auricle
272:balance
268:hearing
110:vertigo
882:Portal
775:macula
763:macula
623:Cells
476:Stapes
303:tragus
144:(1918)
30:cupula
459:Incus
293:helix
205:>.
195:>.
134:from
28:, or
552:bony
340:umbo
270:and
170:2024
104:The
24:The
71:or
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259:e
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