Multiple ChoiceMore than one choice may apply.Movement of which s...

Question

Multiple ChoiceMore than one choice may apply.Movement of which structure triggers bending of hairs of the hair cells in the spiral organ of Corti?a. b. c. d.

Accepted Answer

Welcome back, everyone. The vibrations of the basilar membrane can cause the bending of tiny hair like structures called a bua B bula C macula or D stereo cilia. Let's visualize the following simplified sketch of the cochlea of the ear, which recall is a spiral shaped cavity of the ear located in the inner ear. And we will represent that as this circle and recall that it transduce sound waves into nerve impulses. So within the cochlea, we will then represent via a diagonal cut two sections where the first section we will label as the scalar vestibular. And the second section we will label as the scala tympani. We will then include a horizontal cut which will be representative of the basilar membrane which allows for the distinguishment of the upper layer representing the scala vestibule and the lower layer representing the scala tympani. Recall that sitting on the basilar membrane within the cochlea is a structure known as the organ of the cordi. So we will represent that as a box sitting on the basal membrane organ of the cordi. Recall that the organ of the cordi contains hair cells which we will represent as small circles on top of this box, which is the organ of the cordi. And these hair cells allow the organ of the cordi to convert mechanical sound vibrations into, into electrical signals transmitted to the brain. So these hair cells will contain these small projections which we will draw in. And those projections we will label as stereo cilia and the circles they are connected to again are representative of hair cells sitting on top of the organ of the cordi. So when the basilar membrane vibrates, so we'll kind of draw it squiggly to represent it vibrating, it's vibrating via sound waves that enter the cochlea. And that will then cause those projections on the hair cells being the stereo cilia to bend. So ultimately, the stereo cilia bend in response to basal or membrane vibrations from sound waves. So let's place a check mark by choice D then we can consider choice a the bua recall that the bua is associated with the semicircular canals of the air and not the cochlea. It's a gelatinous structure that is found in the bula of the semi circular canals. And it's more so associated with detecting rotational movements of the head. So it does not have any involvement with bending of the stereo cilia. And we will rule out the bua and choice A for that reason, we then have choice B the Ambu recall that the Ambu is a structure that is a part of the vestibular semi circular canals and the Ambu is representative of an enlargement at the end of each semicircular canal and it will actually contain the cupula. So again, there is no involvement with stereo cilia here. And for that reason, we rule out b the Ambu, we can also consider c the macula recall that the macula is located within the utricle and saccule organs of the vestibular. And the macula are responsible for detecting linear acceleration and changes in head position. The hair cells that are contained within the macula are known as auto lifts. So the immaculate does not contain stereo cilia. But the auto lith hair cells again are more associated with detection of head position and linear acceleration induced by gravity and motion. So, C is not involved with the vibrations of the Basler membrane and we would rule it out for that reason. And so we are able to then confirm that choice. D sila is the correct answer as the tiny hair like structures which bend in response to vibrations via the basilar membrane. So this is our final answer. I hope this made sense. And let us know if you have any questions.

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Multiple ChoiceMore than one choice may apply.Movement of which structure triggers bending of hairs of the hair cells in the spiral organ of Corti?a. b. c. d.

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