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Topic: Semicircular canal

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	X. The Organs of the Senses and the Common Integument. 1d. 4. The Internal Ear or Labyrinth. Gray, Henry. 1918. ... (Site not responding. Last check: 2007-10-30)
		The Semicircular Ducts (ductus semicirculares; membranous semicircular canals), (Figs.
		Occupying the spiral canal of the modiolus is the spiral ganglion of the cochlea (ganglion of Corti) (Fig.
		The veins of the vestibule and semicircular canals accompany the arteries, and, receiving those of the cochlea at the base of the modiolus, unite to form the internal auditory veins which end in the posterior part of the superior petrosal sinus or in the transverse sinus.
	www.bartleby.com /107/232.html (4443 words)

	Vestibular Function & Anatomy
		Each semicircular canal is maximally sensitive to motion in the plane of that canal.
		The superior canal on one side is paired with the posterior canal on the opposite side.
		The sensory portion of the semicircular canals is the ampulla.
	www.utmb.edu /otoref/Grnds/Vestibular-2004-0414/Vestibular-2004-0414.htm (1731 words)

	Semicircular canal -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-30)
		The semicircular canals are three half-circular, interconnected tubes located inside each ear that are the equivalent of three gyroscopes located in three planes perpendicular (at right angles) to each other.
		Each canal is filled with a fluid called (The bodily fluid that fills the membranous labyrinth of the inner ear) endolymph and contains a motion sensor with little hairs whose ends are embedded in a gelatinous structure called the cupula.
		The cupula and the hairs move as the fluid moves inside the canal in response to an angular acceleration.
	www.absoluteastronomy.com /encyclopedia/s/se/semicircular_canal.htm (97 words)

	Superior Semicircular Canal Dehiscence Syndrome and Multi-Detector Row CT -- Curtin 226 (2): 312 -- Radiology
		Superior Semicircular Canal Dehiscence Syndrome and Multi–Detector Row CT Hugh D. Curtin, MD From the Department of Radiology, Massachusetts Eye and Ear Infirmary, 243 Charles St, Boston, MA 02114.
		of the upper arc of the superior semicircular canal.
		Tullio phenomenon with dehiscence of the superior semicircular canal.
	radiology.rsnajnls.org /cgi/content/full/226/2/312 (1863 words)

	Diagnosis and management of benign paroxysmal positional vertigo (BPPV) -- Parnes et al. 169 (7): 681 -- Canadian ...
		particles adherent to the cupula of a semicircular canal (Fig.
		Depiction of canalithiasis of the posterior canal and cupulolithiasis of the lateral canal.
		Schema of patient and concurrent movement of posterior/ superior semicircular canals and utricle.
	www.cmaj.ca /cgi/content/full/169/7/681 (5567 words)

	Vertigo Due to an Opening in the Bone Overlying the Superior Semicircular Canal (Site not responding. Last check: 2007-10-30)
		The inner ear balance organs consist of three semicircular canals (the horizontal, posterior, and superior canals) that are located at roughly right angles to one another.
		This abnormal activation of the balance canal results in vertigo and in a sensation of motion of objects that are known to be stationary.
		The syndrome we have identified is due to an opening in the bone overlying the superior semicircular canal.
	www.bme.jhu.edu /labs/chb/disorders/scd/scd.html (877 words)

	eMedicine - Superior Canal Dehiscence : Article by Wayne T Shaia, MD
		The region of the superior semicircular canal is located with identification of the arcuate eminence.
		Transmastoid superior canal occlusion: In this approach, a mastoidectomy is performed and the superior semicircular canal is identified near the ossicular heads.
		Ostrowski VB, Byskosh A, Hain TC: Tullio phenomenon with dehiscence of the superior semicircular canal.
	www.emedicine.com /ent/topic793.htm (3578 words)

	The Nuclear Receptor Nor-1 Is Essential for Proliferation of the Semicircular Canals of the Mouse Inner Ear -- Ponnio ...
		After closure of the semicircular canals, Nor-1 is localized in the inner side of each canal, as shown at E13.5 (G) and P1 (H and I) at the level of the anterior semicircular canal.
		fluid-filled membranous ducts of the semicircular canals are
		of the semicircular canals inhibited proliferation of the canal
	mcb.asm.org /cgi/content/full/22/3/935 (6262 words)

	Netrin 1 is required for semicircular canal formation in the mouse inner ear. (Site not responding. Last check: 2007-10-30)
		Netrin 1 is required for semicircular canal formation in the mouse inner ear.The morphogenetic development of the mammalian inner ear is a complex multistep process, the molecular and cellular details of which are only beginning to be unraveled.
		In netrin 1 mutant mice, fusion plate formation is severely affected resulting in a reduced anterior semicircular canal and the complete lack of the posterior and lateral canals.
		Our results suggest that netrin 1 facilitates semicircular canal formation through two different mechanisms: (1) it participates in the detachment of the fusion plate epithelia from the basement membrane, and (2) it stimulates proliferation of the periotic mesenchymal cells which then push the epithelial cell walls together to form the fusion plate.
	www.pdg.cnb.uam.es /UniPub/iHOP/gp/2116080.html (193 words)

	The Nuclear Receptor Nor-1 Is Essential for Proliferation of the Semicircular Canals of the Mouse Inner Ear -- Ponnio ...
		The Nuclear Receptor Nor-1 Is Essential for Proliferation of the Semicircular Canals of the Mouse Inner Ear -- Ponnio et al.
		The Nuclear Receptor Nor-1 Is Essential for Proliferation of the Semicircular Canals of the Mouse Inner Ear
		canals is diminished and the roof of the ampulla appears flattened
	mcb.asm.org /cgi/content/abstract/22/3/935 (477 words)

	Sound- and Pressure-Induced Vertigo Associated with Dehiscence of the Roof of the SuperiorSemicircular Canal -- Mong et ...
		of the roof of the superior semicircular canal.
		A 33-year-old woman with sound-induced (Tullio phenomenon) and pressure-induced (Hennebert's sign) vertigo associated with dehiscence of the arcuate eminence (roof) of the superior semicircular canal.
		may be upward and torsional in the plane of the canal (9, 14).
	www.ajnr.org /cgi/content/full/20/10/1973 (1913 words)

	Surgical Plugging of the Semicircular Canal (Site not responding. Last check: 2007-10-30)
		Ewald introduced a surgical procedure in the late 1800s termed "canal plugging" where the slender duct of a semicircular canal is occluded in an attempt to block sensitivity of the associated ampullary organ to angular motion stimuli (Ewald, 1892).
		Since its reintroduction by Money and Scott (1962) canal plugging has been used for the treatment of vestibular disorders such as benign paroxysmal positional vertigo and to study the influence of individual canal and otolithic afferent inputs to the vestibular reflex systems.
		Until recently it was presumed that canal plugging completely blocked the sensitivity of the occluded canals and that partial recovery of the VOR following surgery was the result of adaptation by the central nervous system to use inputs from the remaining functional end organs.
	www.bioen.utah.edu /faculty/RDR/CanalPlug.html (471 words)

	Palaeos Vertebrates: Glossary S
		Semicircular Canal ("SCC") Organs closely associated with the brain which contain minute otoliths and hair cells.
		Except in the most primitive vertebrates, there are 3 pairs of SCCs, each of which probably senses motion or orientation in one spatial dimension.
		The labyrinth is composed of the semicircular canals and associated ampullae.
	www.palaeos.com /Vertebrates/Lists/Glossary/GlossaryS.html (2427 words)

	CiteULike: Convergence of limb, visceral, and vertical semicircular canal or otolith inputs onto vestibular nucleus ... (Site not responding. Last check: 2007-10-30)
		Convergence of limb, visceral, and vertical semicircular canal or otolith inputs onto vestibular nucleus neurons.
		The major goal of this study was to determine the patterns of convergence of non-labyrinthine inputs from the limbs and viscera onto vestibular nucleus neurons receiving signals from vertical semicircular canals or otolith organs.
		A secondary aim was to ascertain whether the effects of non-labyrinthine inputs on the activity of vestibular nucleus neurons is affected by bilateral peripheral vestibular lesions.
	www.citeulike.org /user/jcohenadad/article/916982 (549 words)

	Positional down beating nystagmus in 50 patients: cerebellar disorders and possible anterior semicircular canalithiasis ...
		The rarity of anterior canal BPPV is assumed to be due to the
		The labyrinth is viewed sideways and has been rotated backwards in pitch so that the horizontal canal lies at an angle of 30° with respect to earth horizontal—that is, the position found with the head normally upright.
		sagittal plane whereas the anterior canals are at 41°.
	jnnp.bmjjournals.com /cgi/content/full/72/3/366 (4268 words)

	Unilateral Semicircular Canal Aplasia in Goldenhar's Syndrome -- Lemmerling et al. 21 (7): 1334 -- American Journal of ...
		Note the presence of normal lateral (arrowhead) and posterior (small arrows) semicircular canals on the left side, whereas these structures are absent on the right side.
		limb of the superior semicircular canal and the inferior limb
		The observation of unilateral semicircular canal aplasia in
	www.ajnr.org /cgi/content/full/21/7/1334 (1409 words)

	[No title]
		The fluid in the boxcar is the endolymph in the canal.
		Things appear, with the canal, to be in a cylindrical coordinate system, and it seems that the hair cells should bend with a center of flexion at the center of the canal radius.
		It should be possible to simulate the actual geometry of the canal and hair cell, but for now we will work with the approximation of the boxcar analogy.
	www.engin.brown.edu /courses/en122/arch/canal.html (1494 words)

	Resting discharge and response dynamics of horizontal semicircular canal afferents of the toadfish, Opsanus tau -- ...
		Resting discharge and response dynamics of horizontal semicircular canal afferents of the toadfish, Opsanus tau -- Boyle and Highstein 10 (5): 1557 -- Journal of Neuroscience
		Resting discharge and response dynamics of horizontal semicircular canal afferents of the toadfish, Opsanus tau
		semicircular canal were studied in the toadfish using sinusoidal,
	www.jneurosci.org /cgi/content/short/10/5/1557 (664 words)

	Differential processing of semicircular canal signals in the vestibulo- ocular reflex -- Angelaki et al. 15 (11): 7201 ...
		Differential processing of semicircular canal signals in the vestibulo- ocular reflex -- Angelaki et al.
		Differential processing of semicircular canal signals in the vestibulo- ocular reflex
		semicircular canal signals are spatially transformed from a head-fixed to a
	www.jneurosci.org /cgi/content/short/15/11/7201 (533 words)

	Pharmacological characterization of ATP receptors in ampulla from frog semicircular canal -- Butlen et al. 275 (1): 253 ...
		Influence of ATP and ATP agonists on the physiology of the isolated semicircular canal of the frog (Rana pipiens).
		Indirect evidence for the presence and physiological role of endogenous extracellular ATP in the semicircular canal.
		Purine and pyrimidine nucleotide-sensitive phosphoinositidase C in ampulla from frog semicircular canal.
	ajpregu.physiology.org /cgi/content/full/275/1/R253 (4538 words)

	P792 : Nystagmus in dorsolateral medullary infarction indicates a vestibular semicircular canal imbalance (Site not responding. Last check: 2007-10-30)
		Nystagmus in dorsolateral medullary infarction indicates a vestibular semicircular canal imbalance
		To test if the nystagmus results from an imbalance of the central pathways of the semicircular canals we examined four patients with dorsolateral medullary syndrome (two right, two left sided) and recorded nystagmus binocularly with the three-dimensional search coil technique.
		We propose that the nystagmus in the dorsolateral medullary syndrome may be due to vestibular imbalance caused by a lesion of the central semicircular canal pathways of the horizontal and posterior semicircular canals.
	www.thieme.de /abstracts/aktneu/abstracts2003/daten/p792.html (250 words)

	Chloride secretion by semicircular canal duct epithelium is stimulated via beta 2-adrenergic receptors -- Milhaud et ...
		Cells from neonatal rat semicircular canal epithelium, exclusive of the common crus, were dispersed and seeded on permeable
		Native canal ducts from neonatal rats were divided into several approximately equal-sized samples.
		for ICI-118551 of the receptor in the canal epithelium is distinctly
	ajpcell.physiology.org /cgi/content/full/283/6/C1752 (4573 words)

	Arch Otolaryngol Head Neck Surg -- Abstract: Sound- and/or Pressure-Induced Vertigo Due to Bone Dehiscence of the ...
		ampullopetal deflection of this canal's cupula in the presence
		of a dehiscence of bone overlying the canal.
		Superior Canal Dehiscence Is Not Due to Cephalic Displacement of the Labyrinth
	archotol.ama-assn.org /cgi/content/abstract/124/3/249 (495 words)

	Nkx5-1 controls semicircular canal formation in the mouse inner ear. (Site not responding. Last check: 2007-10-30)
		Nkx5-1 controls semicircular canal formation in the mouse inner ear.This gene is expressed in vestibular structures throughout inner ear development.
		The balance defect correlates with severe malformations of the vestibular organ in Nkx5-1(-/-) mutants, which fail to develop the semicircular canals.
		Mice carrying the Nkx5-1 null mutation exhibit behavioural abnormalities that resemble the typical hyperactivity and circling movements of the shaker/waltzer type mutants.
	www.pdg.cnb.uam.es /UniPub/iHOP/gp/1300988.html (170 words)

	Persistence of perilymph fistula mechanism in a completely paretic posterior semicircular canal -- Helmchen et al. 76 ...
		Persistence of perilymph fistula mechanism in a completely paretic posterior semicircular canal -- Helmchen et al.
		Persistence of perilymph fistula mechanism in a completely paretic posterior semicircular canal
		canal as a result of a perilymph fistula (PLF) were studied.
	www.jnnp.com /cgi/content/abstract/76/2/280 (156 words)

	Impulsive Testing of Individual Semicircular Canal Function -- HALMAGYI et al. 942 (1): 192 -- Annals of the New York ...
		Impulsive Testing of Individual Semicircular Canal Function -- HALMAGYI et al.
		semicircular canals in normal subjects, in subjects who had
		impulses in any one of the three semicircular canal planes.
	www.annalsnyas.org /cgi/content/abstract/942/1/192 (344 words)

	ANNALS Dec1997: TRANSECTION AND OCCLUSION OF LATERAL SEMICIRCULAR CANAL IN GUINEA PIGS (Site not responding. Last check: 2007-10-30)
		The lateral semicircular canal was drilled out, and then the canal lumens were plugged with muscle pieces.
		After a serial recording of auditory brain stem responses for 2 months, histologic specimens of the temporal bones were prepared in the lateral semicircular canal plane.
		Histopathologic examination revealed that the bone defect on the lateral canal was replaced with newly formed bone; the perilymphatic and endolymphatic spaces maintained their compartmentalization; and the membranous endolymphatic canal healed to form complete blind ducts.
	www.annals.com /abs/annals99.htm (186 words)

	Right Temporal Bone 1
		Superior semicircular canal and the petrous portion of the facial (VII) nerve as it enters the internal auditory canal.
		This is the narrowest part of the facial nerve and the segment which is felt to be damaged in Bell's Palsy.
		This slide shows the superior semicircular canal and the geniculate ganglion of the VII nerve.
	www.ear-anatomy.com /right_temporal_bone_1.htm (84 words)

	Pharmacological characterization of ATP receptors in ampulla from frog semicircular canal -- Butlen et al. 275 (1): 253 ...
		Pharmacological characterization of ATP receptors in ampulla from frog semicircular canal -- Butlen et al.
		Pharmacological characterization of ATP receptors in ampulla from frog semicircular canal
		Purine and pyrimidine nucleotide-sensitive phospholipase A2 in ampulla from frog semicircular canal
	ajpregu.physiology.org /cgi/content/abstract/275/1/R253 (317 words)

	vgn-ext-hidden_PubMed (Site not responding. Last check: 2007-10-30)
		Separate Na,K-ATPase genes are required for otolith formation and semicircular canal development in zebrafish.
		The otolith defect produced by morpholinos was rescued by microinjection of zebrafish alpha1a.1 or rat alpha1 mRNA, while the ouabain-induced defect was rescued by expression of ouabain-resistant zebrafish alpha1a.1 or rat alpha1 mRNA.
		Knockdown of a second zebrafish alpha subunit, alpha1a.2, disrupted development of the semicircular canals.
	www.asco.org /portal/site/ASCO/menuitem.a3fb42726842a82627c4c291ee37a01d/?vgnextoid=d70b3608f9958010VgnVCM100000f2730ad1RCRD&index=n&pmid=16566913 (263 words)

	Calcium Currents in Hair Cells Isolated from Semicircular Canals of the Frog -- Martini et al. 78 (3): 1240 -- ...
		Electrophysiological properties and morphology of hair cells isolated from the semicircular canal of the frog.
		Studies of solitary semicircular canal hair cells in the adult pigeon.
		Static and dynamic properties of synaptic transmission at the cyto-neural junction of frog labyrinth posterior canal.
	www.biophysj.org /cgi/content/full/78/3/1240 (6658 words)

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