Lecture 2: Forebrain - cerebral cortex Flashcards

1
Q

Efferent fibres of the cortex?

A

Projection fibres (V) - corticofugal

Association and commisural fibres (III)

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2
Q

Layer II?

A

External granular

Small granular neurons (8-20microns)

sensory input from other areas of the brain

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3
Q

Layer III

A

external pyramidal

10-40 mircons thinck

Info to other areas of the cotex

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4
Q

Layer IV

A

Internal granular

larger granular cells recieving most of the sensory info from the peripery

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5
Q

Layer V

A

Internal pyramidal

large (60-120microns) motor neurons froming the pyramidal tract kown as BETZ CELLS

UPPER MOTOR NEURON

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6
Q

Layer VI

A

Multiform layer

least clear function, is a mixture of granular and pyramidal the same ratio that is between II and V

some integration of sensory input

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7
Q

Afferent fibres of the cortex?

A

Specific afferent (IV) - corticopetal - said to be the granular layer dividing infra and supra-granular

Association and commissural afferents (I, II, III) - Said to be the supragranular layer

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8
Q

Major types of cerebral cotex?

A

Heterotypical

  • mostly one cell type (agranular or granular)
  • Eg. 1˚ motor cotex = agranular

Homotypical

  • Most of the cortex appears as this
  • an even mixture of pyramidal and granular
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9
Q
A
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