Topic 19: Nervous System - CNS Protective Features - BBB and Cerebral Arterial Circle Flashcards

1
Q

What are the 2 cell types of the blood brain barrier?

A
  • endothelial cells of capillaries with tight junctions
  • astrocytes
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2
Q

What do astrocytes do?

A
  • foot processes wrap around endothelial cells
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3
Q

What type of permeability is the blood brain barrier?

A

selectively permeable

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4
Q

What does selective permeability of the BBB allow for? (2)

A
  • allows glucose and fat soluble material in
  • does not allow toxins, antibiotics, etc.
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5
Q

What is the cerebral arterial circle?

A
  • cerebral arteries form circle at base of forebrain
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6
Q

What does the cerebral arterial circle circle?

A
  • pituitary gland and optic chiasma (where optic nerves cross)
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7
Q

What does the cerebral arterial circle unite?

A
  • unites the two major blood supplies to the brain (anterior and posterior)
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8
Q

What does the cerebral arterial circle provide, if vessels are blocked?

A
  • alternate route for blood
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9
Q

Blood flow to brain posteriorly

A

vertebral arteries -> basilar artery -> posterior cerebral arteries

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10
Q

Arteries of the brain diagram

A
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11
Q

Blood flow to brain anteriorly

A
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12
Q

Blood return from brain diagram

A
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