The brain then makes sense of that message and fires off a response.


Sound vibrations cause the displacement of hair cells.

▶ This displacement causes the cells to depolarize, and an impulse is generated.

▶ This impulse is conducted via the vestibulocochlear nerve, where the cochlear nuclei synapse with the superior olivary complex present in the brain-stem, which then synapses with the inferior colliculus present in the mid-brain.

▶ The inferior colliculus finally conducts the impulse to the primary auditory cortex, passing via the thalamus.

Although in higher organisms, sensory neurons conduct nerve impulses from the periphery to the CNS, in simpler organisms like hydra, the sensory neurons directly conduct impulses to the motor neurons.


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