Development of the Nervous System - Postnatal Cerebral Development in HUman Infants

5 important questions on Development of the Nervous System - Postnatal Cerebral Development in HUman Infants

Of what two membranes does the organ of Corti exists?

 

1. Basilar membrane; the hair cells (auditory receptors) are located here.

2. Tectorial membrane; membrane that rests on the hair cells.

How is the auditory system organized?

Tonotopic; the structures of the auditory system are arranged according to frequency.

Describe the route from the ear to the Primary Auditory Cortex

Axons of the auditory nerve synapse in the ipsilateral cochlear nuclei. 

Projections lead to the superior olives on both sides of the brain stem.

The axons of superior olives; via lateral lemniscus to the inferior colliculus. 

These axons synapse into the medial geniculate nuclei of the thalamus.

From here it is projected to the Primary Auditory Cortex

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How is sound in localized in space mediated?

By the lateral and medial superior olives, but in different ways.

What is the function of the superior colliculi in sound localization?

The Superior Colliculi receive input from the medial and lateral superior olives. The organization of the superior colliculi are a map of auditory space.

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