What Is a Modiolus

question 40

Multiple Choice

What is a modiolus?

• A) bone around the cochlea
• B) a bony area around the junction of the facial, vestibular, and cochlear nerves
• C) bone in the center of a semicircular canal
• D) a bone pillar in the center of the cochlea

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Definitions:

Neurotransmitter

Chemical messengers released from neurons to transmit signals across synapses to other neurons or cells.

Receptor Sites

Specific locations on the surface of a cell or within a cell where hormones, neurotransmitters, or drugs can bind to create a change in the cell.

Postsynaptic Neuron

The neuron that receives a signal (neurotransmitter) across the synaptic gap from a presynaptic neuron.

Presynaptic Neuron

A neuron that releases neurotransmitters from its axon terminal into the synaptic cleft to transmit a signal to the receiving (postsynaptic) neuron.