Directional sound sensitivity in utricular
afferents in the toadfish Opsanus tau.
Symmetries of a generic utricular
projection: neural connectivity and the distribution of utricular
According to the widely accepted theory (canalithiasis), otoconia dislodged from the utricular
or saccular macula subsequently move into the semicircular canal (SCC) and cause an endolymph displacement that stimulates the cupula of the SCC (4).
Vertical and horizontal nystagmus were triggered, while the utricular
function and postural stability remained unchanged.
Hurley et al., "Developmental changes in two voltage-dependent sodium currents in utricular
hair cells," Journal of Neurophysiology, vol.
BPPV is caused by free otoconia dislodged from the utricular
macula that have entered the semicircular canal, where they provoke an inappropriate flow of endolymph whenever the head is rotated in the plane of the affected canal .
Ocular vestibular evoked myogenic potential (oVEMP) reflect the excitatory utricular
response and are used to evaluate the ascending vestibular pathway, as the crossed vestibulo-ocular reflex (13) pointed to the shift of the contralateral eye to sound stimulation of the vestibular system (14), demonstrating that acoustic stimulation of the otoliths leads to oVEMP However, there still are doubts about whether oVEMP records changes exclusively in the utriculus or also in the sacculus (15).
Although the pathophysiological process of the disease has not been fully clarified, currently, the widely accepted opinion is that the disease results from the accumulation of otoconia that are detached from the utricular
macula in the semicircular canals and thereby sensitizing such canals to gravity (1).
While c-VEMP mainly assesses saccular function and the vestibulo collic reflex, o-VEMP assesses utricular
function and the vestibulo-ocular reflex (VOR).
Most prostatic utricular
cysts are asymptomatic, especially when small.
Dentro deles, encontramos estruturas sensoriais: as maculas utricular
e sacular, que respondem a gravidade e a aceleracoes lineares.
otoliths lapilli of teleosts: their morphology and relevance for species identification and systematics studies.