Layers of the Cerebral cortex Flashcards

1
Q

Enumerate all the layers of the cerebral cortex

A

Molecular layer (plexiform layer)
External Granular layer
External Pyramidal Layer
Internal Granular layer
Internal Pyramidal layer (ganglionic layer)
Multiform layer (layer of polymorphic cells)

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2
Q

Most superficial which lies directly under the pia mater

A

Molecular layer/ plexiform layer

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3
Q

Consist of dense network of tangentially oriented nerve fibers.

A

molecular layer

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4
Q

Large number of synapses between different neurons that occur

A

molecular layer

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5
Q

Large number of small pyramidal cells and stellate cells

A

External Granular Layer

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6
Q

existence of small cells in the
layer that gives a granular appearance

A

granular

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7
Q

Pyramidal = larger pyramidal cells found here

A

External pyramidal layer

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8
Q

Main input of cortical station

A

Internal Granular Layer

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9
Q

Most of the stimuli from periphery arrive here

A

internal granular layer

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10
Q

Closely packed stellate cells (External band of Baillarger) and smaller portion of
pyramidal cells

A

Internal Granular Layer

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11
Q

Betz cells and medium-sized pyramidal cells
(3% of projection of cortiscopinal tract)

Stellate cells and Cells of Martinotti

Motor activity

Scattered among the pyramidal cells are stellate cells and cells of Martinotti. In addition, a large number of horizontally arranged fibers form the inner band of Baillarger

A

Internal Pyramidal Layer (Ganglionic Layer)

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12
Q

Although the majority of the cells are fusiform, many of the cells are modified pyramidal cells, whose cell bodies are triangular or ovoid. The cells of Martinotti also are visible bin this layer

A

Multiform layer (layer of polymorphic cells)

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13
Q

Composed of closely packed stellate cells with a high concentration of horizontally arranged fibers known collectively as the external band of Baillarger

A

Internal granular layer

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14
Q

It is composed of pyramidal cells whose cell body size increases from the superficial to the deeper borders of the layer.

A

External pyramidal layer

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15
Q

large pyramidal cells

A

betz cells

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16
Q

Responsible for the projection
fibers of the corticospinal
(pyramidal) tract

A

Betz cells

17
Q

Responsible for the rapid
skilled voluntary
movements of the limbs

Controls the prime mover
muscles

A

corticospinal (pyramidal) tract

18
Q

layer that contains the betz cells

A

ganglionic/ internal pyramidal layer

19
Q

Decreased/absence of
Betz cells causes

A

motor neuron disease (primary lateral sclerosis)

20
Q

primary lateral sclerosis affected tracts

A

Corticobulbar, Corticospinal
tract

21
Q

most important cells in
the cerebrum

A

betz cells

22
Q

most important
cells in the cerebellum

A

purkinje cells

23
Q

Most common type of neuron

Apex pointing outwards toward the pia surface of the
brain

A

pyramidal cells

24
Q

Extend orthogonally to their cells layer with dendrites
extending either into deeper and more superficial
layers.

A

fusiform cells

25
Q

Also known as granule layer

Rounded with short dendrites rotating
circumferentially out of the body

Predominantly found in layers 2, 4, 6

A

stellate cells

26
Q

stellate cells predominantly found in

A

layers 2, 4, 6

27
Q

Small cells w/ limited number of short dendrites and
axons which extends superficially

In first layer, afferent fibers originating in thalamus
and its association with the commissural fibers are
also present.

A

cells of martinnotti

28
Q

Least common cell type, only found in layer 1

A

cajal retzius

29
Q

how many layers in cerebellum and cerebrum

A

cerebellum - 3
cerebrum - 6