Hair Cells

by Craig Canby, PhD

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    00:01 Now let's take a look at the maculae that are found in the saccule and the utricle.

    00:09 The maculae contain hair cells and associated here on their apical region are some structures that we refer to as otoconia.

    00:28 These overly the haircells that are shown down in through here. The otoconia are three times denser than the surrounding endolymph.

    00:38 Changes in head position, for example tilting or linear acceleration causes displacement of the otoconia and depolarization or stimulation of the hair cells.

    00:49 This will then initiates synaptic transmission of the afferent nerve fibers of the vestibular component of cranial nerve number VII, the vestibulocochlear nerve.

    01:06 We also have hair cells in the semicircular canals. These are associated with the cristae ampullaris.

    01:17 The cristae ampullaris is characterized by the cupula, very prominent body associated with the cristae ampullaris.

    01:24 Here are the hair cells, and in the simplified drawing, you see one hairlike extension are the sensory hair cells.

    01:33 In reality, there will be numerous cilia which define these hairlike extensions of the apparatus.

    01:44 What will happen here with angular accelaration is let's say you're moving to the right, you're rotating, you're pivoting, what will happen is the endolymph has greater inertia than there's the cupula, and so the endolymph here will push the cupula in this direction causing bending of the haircells and depolarization along the afferent nerve fibers associated with the vestibular nerve.

    02:15 And so this will result in synaptic transmission of those afferent nerve fibers.

    About the Lecture

    The lecture Hair Cells by Craig Canby, PhD is from the course Auditory System and Vestibular System.

    Included Quiz Questions

    1. Otoconia possess more inertia than the hair cells.
    2. Otoconia are located underneath the hair cells.
    3. Their movement stimulates the endolymph.
    4. Otoconia move secondary to the movement of hair cells.
    5. These are main structural component of the crista ampullaris.
    1. Bending of cupula leftwards
    2. Bending of cupula leftwards and bending of hair cells rightwards
    3. Bending of cupula rightwards and bending of hair cells leftwards
    4. Bending of cupula rightwards
    5. Bending of hair cells rightwards

    Author of lecture Hair Cells

     Craig Canby, PhD

    Craig Canby, PhD

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