Descending Pathways Flashcards

1
Q

Where do descending pathways originate?

A

The cerebral cortex and brain stem

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2
Q

What are the medial descending pathways concerned with?

A

Posture

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3
Q

Where do the medial descending pathways terminate?

A

Anteromedial portion of anterior grey horn

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4
Q

What are the lateral descending pathways concerned with?

A

Goal- directed movement

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5
Q

Where do the lateral descending pathways terminate?

A

Lateral part of anterior grey horn

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6
Q

Which pathway is part of extrapyramidal system?

A

The medial pathway

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7
Q

Which pathway is part of the pyramidal system?

A

The lateral pathway

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8
Q

Where do first order neurons in motor pathways arise?

A

Cell bodies in the cortex

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9
Q

Where do Giant Bentz cells arise?

A

Lower limb area of motor cortex (gives rise to largest portion of axons)

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10
Q

What do corticospinal fibres form in the medulla?

A

The pyramids

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11
Q

What are corticonuclear fibres?

A

Fibres given off by corticospinal fibres to cranial motor nuclei

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12
Q

What is the function of Renshaw cells?

A

Inactivate Ia inhibitory interneurons when cooperation between agonist and antagonist muscles are necessary

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13
Q

Where do fibres of corticospinal tract pass through?

A

Corona radiata and posterior limb of internal capsule

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14
Q

Where do fibres from corticonulear tract pass through?

A

The corona radiata and the genu of the internal capsule

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15
Q

What are the most medial fibres in the corticospinal tract?

A

The corticonuclear fibres

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16
Q

Which cranial nerves do not receive direct corticonuclei supply?

A

Those serving extraoccular muscles i.e. occulomotor, trochlear and abducent

17
Q

What does lower motor neuron refer to?

A

alpha motor neurons

18
Q

What does upper motor neuron refer to?

A

All descending pathways