The human auditory
system
Auditory cortex
Medial geniculate
body (Thalamus)
Inferior
colliculus
Lateral lemniscus
Superior olive
Spiral ganglion
Cochlea
Ventral cochlear
nucleus
Dorsal cochlear
nucleus
(Adapted from Bear et al)
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Anatomy and Functioning of the Auditory System: From the Cochlea to the Auditory Cortex, Lecture notes of Human Biology
An overview of the human auditory system, focusing on the structures from the cochlea to the auditory cortex. It includes the topotopic organization along the auditory system, the functions of key structures such as the medial geniculate body and inferior colliculus, and the representation of sound frequency in the ventral medial geniculate body and lateral posterior group. The document also discusses the circuits for auditory fear conditioning and the properties of auditory cortical areas.
What you will learn
- What are the properties of auditory cortical areas?
- How is sound frequency represented in the ventral medial geniculate body and lateral posterior group?
- What is the topotopic organization along the auditory system?
- What are the functions of the medial geniculate body and inferior colliculus?
- What are the circuits for auditory fear conditioning?
Typology: Lecture notes
2021/2022
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The human auditory system Auditory cortex Medial geniculatebody (Thalamus) Inferiorcolliculus Lateral lemniscus Superior olive Spiral ganglion Ventral cochlear Cochlea nucleus Dorsal cochlearnucleus (Adapted from Bear et al)
The topotopic organization is present along the auditory system
From Bear Connors and Paradiso: Neuroscience, Exploring the brain
Medial geniculate body
MGD MGV
MGM
Thalamic reticular nucleus
IC (central)
IC (dorsalcortex)
IC (external cortex) Superior Colliculus VNLL DNLL Cochlear nucleus Spinal cord La corteza
Po
D^ V
M
L
Ascending Auditory pathways
IC CORTEX MGB IT AI AII M V D LC DC IC-CEN SC - Tegmentum Figure 110.
GABA IC projections to MGB
GABA in the neuron(green)
Retrograde transportof red latexmicrospheres (redbeads)
Representation of sound frequency in the ventralMGB and lateral posterior group (PO) Imig and Morel 1985
Conditioned stimulus -tone Auditory cortex Amygdala Lateral Central MGV MGM Defence responses Hypothalamus / pituitry Autonomic nervous system Behaviour Circuits for auditory fear conditioning
The auditory cortex
The auditory cortex in the cat brain