III - Organisation & Coding

11 important questions on III - Organisation & Coding

Does the amplitude of action potentials vary, and what is the rate of responding relate to in neurons?

The amplitude of an action potential does not vary. The number of action potentials propagated per second varies along a continuum.

This rate of responding is also called the spiking rate. Some neurons have a high spiking rate during speech, whilst others may have a complementary profile. Neurons responding to types of information are often grouped together.

What is the function of a region determined by in the brain?

The function of a region is determined by its inputs and outputs.
The extent to which a function can be strictly localised is moot point.

What does grey matter consist of and what does white matter consist of?

Grey matter consists of neuronal cell bodies which are often found in structures or folds.

White matter
consists of axon and support cells (glia's involved in tissue repair and formation of myelin). 
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What is the highly convoluted folded sheet of grey matter, and what lies in the centre of the brain?

The brain consists of a highly convoluted folded sheet of gray matter called the cerebral cortex. Beneath the cerebral cortex lies the white matter.

In the centre of the brain, beneath the bulk white matter lies another collection of gray matter structures called the subcortex 

Which parts of the brain are in the centre of the brain within the subcortex?

In the centre of the brain lies a gray matter subcortex which includes the basal ganglia, limbic system and the diencephalon.

What are the three different kinds of white matter tracts?

Association tract
Commisure
Projection tract 

How does the white matter association tract travel?

The white matter association tract travels cortical within the hemisphere.

How does the white matter commisure association tract travel?

The white matter commisure tract travels cortical between the hemisphere.

How does the white matter Projection Tract travel?

The white matter Projection tract travels cortical to subcortical

How many ventricles does the brain have, and where are the lateral ventricles found?

There are four ventricles.
The lateral ventricles are found in each hemisfere.

What are the ventricles filled with and where do the third and fourth ventricle lie?

The ventricles are filed with cerebrospinalfluid or CSF.

The third ventricle lies centrally around subcortical structures whilst the fourth ventrical lies behind the brainstem or hindbrain..

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