Nervous Flashcards

1
Q

The nervous system as a whole has its origins from what

A

the ectoderm

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2
Q

The brain and spinal cord have their origins from what

A

thickened ectodermal layer

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3
Q

The three concentric layers or the nervous system

A

1) Ependymal layer
2) Mantle layer
3) Marginal layer

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4
Q

What develops from the ependymal layer

A

Low columnar cells

Adult Microvilli

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5
Q

What develops from the mantle layer

A

future grey matter
large neuroblasts/neurons
small glioblasts/glia cells

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6
Q

The White matter of the CNS develops from

A

Marginal layer

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7
Q

The nerve roots below the level of the end of the spinal cord (L1/L2 disc in adult) are called

A

Cauda Equina

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8
Q

These are intertwined within the cauda equinina and are extentions of the pia mater

A

Filum Terminalis (internis)

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9
Q

The end of the spinal cord extends to where at the 3rd moth of development

A

the entire length of the embryo

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10
Q

At the 6th month of development, the spinal cord is level with what

A

1st sacral vertebra

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11
Q

At birth, the spinal cord is level with what

A

2nd and 3rd lumbar vertebra

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12
Q

In the adult, what is the end of the spinal cord (conus medularis)

A

Lower end of the 1st lumbar vert. (L1/L2 disc)

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13
Q

The three primary brain vesicles

A

1) Prosenecphalon (Forebrain)
2) Mesencephalon (midbrain)
3) Rhombencephalon (hindbrain)

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14
Q

The Forebrain divides into these two secondary brain vesicles

A

Telencephalon and Diencephalon

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15
Q

Teh Rhombencephalon divides into these two secondary vesicles

A

Metencephalon (Pons, Cerebellum) and Myelencephalon (M.O.)

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16
Q

This external bending flexure causes the head to bend ventrally at the midbrain

A

Cephalic Flexure

17
Q

This flexure occurs at the junction of the myelencephalon and spinal cord and is external bending

A

Cervical flexure

18
Q

This internal bending flexure occurs between the metencephalon and myelenephalon

A

Poneine Flexure