Fibers projecting onto the crista ampullaris of the vertical anterior semicircular canal from other ipsilateral vestibular receptors in the frog (Rana esculenta)

1974 ◽  
Vol 349 (3) ◽  
pp. 257-265 ◽  
Author(s):  
A. Gribenski ◽  
J. Caston
Keyword(s):  
Semicircular Canal ◽  
Rana Esculenta ◽  
Crista Ampullaris ◽  
Anterior Semicircular Canal

scholarly journals Design and Analysis of Posterior Semicircular Canal BPPV Diagnostic Test Based on Physical Simulation

2021 ◽  
Author(s):  
Xiaokai Yang ◽  
Qiancheng Yang ◽  
Zhaobang Liu
Keyword(s):  
Diagnostic Test ◽  
Semicircular Canal ◽  
Physical Simulation ◽  
Normal Vector ◽  
Forward Angle ◽  
Unit Normal Vector ◽  
Posterior Semicircular Canal ◽  
Average Value ◽  
Crista Ampullaris ◽  
Unit Normal

Abstract To discusses and analyzes how to realize the design of posterior semicircular canal BPPV diagnostic maneuver. First, measure the spatial attitude of the human semicircular canal, establish a BPPV virtual simulation platform, then analyze the key positions of the maneuver, and finally design a new diagnostic maneuver according to the demand, and perform physical simulation verification. The average value of the unit normal vector of the right posterior semicircular plane is [ 0.660, 0.702, 0.266], after rotate -46.8 ° around Z axis and 15.4 ° around Y axis, it parallel to the X axis. After that, when the tilt back angle reaches 70 °, the free otoconia in the left utricle will fall into the common crus; when bend forward 53.3°, the unit normal vector of the crista ampullaris plane of the posterior semicircular canal to the XY plane; when bend forward angle reaches 30°, the otoconia slides to the opening of the ampulla; when bend forward angle reaches 70°, the otoconia slides to the bottom of the crista ampullaris. The shallow pitching Yang maneuver is designed as turn head 45° to the one side, bend forward 45°, tilt back 90°, and bend forward 90°. The deep pitching Yang maneuver is designed as bend forward 90°, turn head 45° to one side, tilt back 135°, and bend forward 90°. A new posterior semicircular BPPV diagnostic test is designed to make the induced nystagmus have the characteristics of long latency, reversal, and repeatability, will not cause the inhibitory stimulation of the contralateral superior semicircular canal, and has good operation fault tolerance, which is of great value for clinical and scientific research.

Neurodynamic response analysis of anterior semicircular canal afferents in the pigeon

1980 ◽  
Vol 43 (6) ◽  
pp. 1746-1770 ◽  
Author(s):  
J. P. Landolt ◽  
M. J. Correia
Keyword(s):  
Time Constant ◽  
Semicircular Canal ◽  
Angular Acceleration ◽  
Neural Response ◽  
Response Analysis ◽  
Torsion Pendulum ◽  
Generator Potential ◽  
Pendulum Model ◽  
Anterior Semicircular Canal ◽  
Semicircular Canal Afferents

1. The neurodynamic responses to sinusoidal and pulse angular accelerations were studied in anterior semicircular canal afferents in the barbiturate-anesthetized pigeon. 2. The resting discharge frequency, aS, varied from 7.4 to 149.0 impulses/s. For most units, aS remained fairly constant for long periods of time during the experiment. 3. The neural-response harmonic distortion, resulting from stimulation by sinusoidal angular accelerations, varied in different units. Percent distortions from as low as 3% to those as high as 57% were determined. 4. Intensity-function plots of peak first harmonic neural response as a function of the peak sinusoidal angular acceleration (with frequency, f, as a parameter) are of two types: one has a linear relationship between the variables; the other demonstrates pronounced nonlinearities ("saturation," particularly for low values of f). In saturation-type units, the data of which fit a power law function, the exponent of the function is frequency dependent, becoming closer and closer to unity with increasing f. 5. Data for all units fit the transfer function, G'(s) = Csk/(tauLS + 1), where G'(s) relates the unit response to angular acceleration, C is a gain constant, 0 < k < 1, and tauL is the so-called long time constant of the classical torsion pendulum model. tauL varied from 4.45 to 22.17 S (mean +/- SE = 10.24 +/- 1.20 S). This may be interpreted as an indication of a regional distribution of tauL'S within the neuroepithelium. Arguments are advanced to show that this is consistent with our present understanding of the ampullary end organ. 6. The degree of regularity of the spontaneous discharge (as determined by the coefficient of variation, CV) was significantly correlated with the parameter k in G'(S). The larger the CV, the larger is the corresponding k. Further work indicated that the larger the value of k, the more adaptation a unit exhibited (k varied from 0.017 to 0.66). 7. The time-domain response of G(S) = G'(S)/(tauSS + 1) to different durations of pulse angular acceleration stimuli agreed well with the neural response to these stimuli (tauS = 2.27 ms is the short time constant of the torsion pendulum model). 8. The term Sk was decomposed into an expression containing a series of polynomials in S in the numerator and denominator. The first term in this expansion K0tau1S/(tau1S + 1), has previously been shown to describe so-called adaptation properties in the dynamics of the semicircular canals. A mean (+/-SE) tau1 = 71.56 (+/-10.01) S was determined. Evidence is presented that Sk probably represents a relaxation phenomenon comprised of a time-varying intracellular Na+/K+-transport process, components of which are summed with the generator potential in the afferent terminal(S) of the receptor hair cell.

Evolution of Treatment Maneuvers for Benign Paroxysmal Positional Vertigo

2016 ◽  
Author(s):  
Robert W. Baloh
Keyword(s):  
21St Century ◽  
Semicircular Canal ◽  
Benign Paroxysmal Positional Vertigo ◽  
Posterior Semicircular Canal ◽  
Initial Examination ◽  
Positional Vertigo ◽  
Anterior Semicircular Canal ◽  
Paroxysmal Positional Vertigo

Near the turn of the 21st century, as more physicians began performing the Epley and Semont maneuvers for treatment of benign paroxysmal positional vertigo (BPPV), it became apparent that the procedures could be done at the time of initial examination without the need for sedation or vibration. Furthermore, modified versions of the maneuvers evolved that were more effective and easier to perform. There are clear similarities in these modified repositioning maneuvers. BPPV nearly always results from otoconial debris within the posterior semicircular canal because this is the canal in which it is most easily trapped. Although less common, there are horizontal and anterior semicircular canal variants of BPPV, and otolithic debris can become attached to the cupula, producing a true cupulolithiasis. The nystagmus is in the plane of the affected canal; the nystagmus is transient when the debris is freely floating and persistent when debris is attached to the cupula.

scholarly journals Morphological Features of Different Regions in Frog Crista Ampullaris(Rana esculenta).

1995 ◽  
Vol 58 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Luciana GIOGLIO ◽  
Terenzio CONGIU ◽  
Daniela QUACCI ◽  
Ivo PRIGIONI
Keyword(s):  
Rana Esculenta ◽  
Morphological Features ◽  
Crista Ampullaris

The Effect of Canalith Repositioning for Anterior Semicircular Canal Canalithiasis

ORL ◽  
2005 ◽  
Vol 67 (1) ◽  
pp. 56-60 ◽  
Author(s):  
Yoon Kyung Kim ◽  
Jeong Eun Shin ◽  
Jong Woo Chung
Keyword(s):  
Semicircular Canal ◽  
Anterior Semicircular Canal

Axonal pathways and projection levels of anterior semicircular canal nerve-activated vestibulospinal neurons in cats

2006 ◽  
Vol 406 (1-2) ◽  
pp. 1-5 ◽  
Author(s):  
Naoharu Kitajima ◽  
Akemi Sugita-Kitajima ◽  
Rishu Bai ◽  
Mitsuyoshi Sasaki ◽  
Hitoshi Sato ◽  
...  
Keyword(s):  
Semicircular Canal ◽  
Anterior Semicircular Canal ◽  
Vestibulospinal Neurons

Involvement of the Anterior Semicircular Canal in Posttraumatic Benign Paroxysmal Positioning Vertigo

2011 ◽  
Vol 32 (8) ◽  
pp. 1285-1290 ◽  
Author(s):  
Julia Dlugaiczyk ◽  
Stefan Siebert ◽  
Dietmar J. Hecker ◽  
Christoph Brase ◽  
Bernhard Schick
Keyword(s):  
Semicircular Canal ◽  
Anterior Semicircular Canal ◽  
Benign Paroxysmal Positioning Vertigo

Adenylate cyclase and carbonic anhydrase in the semicircular canal epithelium of the frog Rana esculenta

1990 ◽  
Vol 262 (3) ◽  
pp. 579-585 ◽  
Author(s):  
Olivier Oudar ◽  
Evelyne Ferrary ◽  
G�rard Feldmann
Keyword(s):  
Carbonic Anhydrase ◽  
Adenylate Cyclase ◽  
Semicircular Canal ◽  
Rana Esculenta

scholarly journals NEUROANATOMÍA DEL SAURÓPODO TITANOSAURIO NARAMBUENATITAN PALOMOI DEL CRETÁCICO SUPERIOR DE PATAGONIA, ARGENTINA.

2020 ◽  
Author(s):  
Ariana Paulina-Carabajal ◽  
Leonardo Filippi ◽  
Fabien Knoll
Keyword(s):  
Semicircular Canal ◽  
Upper Cretaceous ◽  
Semicircular Canals ◽  
Lateral View ◽  
Phylogenetic Position ◽  
Posterior Semicircular Canal ◽  
X Ray ◽  
Anterior Semicircular Canal ◽  
X Ray Computed ◽  
The Brain

this taxon has uncertain phylogenetic relationships within the clade. An X-ray Computed Tomography (CT) scan of the holotypebraincase allowed the first reconstruction of the brain and inner ear of this taxon, making it possible to compare the neuroanatomy with thatof closely related forms. Except for the slightly sigmodal shape of the endocast in lateral view—considered a basal condition—, the brainshows derived titanosaurian traits such as a poorly developed dorsal expansion and a single exit for Cranial Nerve (CN) XII. In contrast, the innerear exhibits slender and long semicircular canals (the anterior semicircular canal is distinctly longer than the posterior semicircular canal), whichis a character present in more basal representatives of the group, such as Sarmientosaurus. We consider, however, the morphology of theinner ear as an unreliable indicator of phylogenetic position. Furthermore, there is a remarkable similarity between the morphology of theendocast of Narambuenatitanand the possible saltasaurid from (FAM 03.064), from the Upper Cretaceous of Fox-Amphoux-Métisson, France,suggesting saltasaurine affinities for the Argentinean taxon.

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