時差N小時:耳石(上)

Ear rocks, also known as “otoliths,” are tiny pebblesof calcium carbonate in our inner ear that help keepus balanced. They’re located deep inside the innerear in a small pouch called a utricle. When we moveour heads, the tiny rocks move around and bumpinto nerve cells. These nerve cells send signals to ourbrain that tell it which way the head is oriented. It’sone way we know up from down. But problems withear rocks can be a cause of chronic dizziness orvertigo. Occasionally the little pebbles fall out of theutricle and can get into another part of the inner earcanals. When this happens, the brain senses that we’re moving much more than we really are,resulting in sensations of unsteadiness or dizziness.

耳巖，也被稱為“耳石”，是內(nèi)耳中碳酸鈣形成的晶體，它幫助我們保持平衡。它們位于內(nèi)耳深處一個叫作“胞囊”的地方。當(dāng)我們移動頭部時，晶體也會四處移動并接觸到神經(jīng)細(xì)胞。這些神經(jīng)細(xì)胞將信號發(fā)送到我們的大腦，告訴大腦頭面向的方向。這是一種讓我們知道上下的方式。但耳石有問題的話，它會導(dǎo)致慢性頭暈或眩暈。有時候，小晶體會從“胞囊”中掉出來，并進(jìn)入到內(nèi)耳道中。當(dāng)這種情況發(fā)生時，大腦感到我們移動的距離要比實際移動的距離多很多，這會造成不穩(wěn)或頭暈的感覺。