Cranium, Ventricles, Meninges (Lecture #5) Flashcards

1
Q

what part of the brain rests in the anterior cranial fossa

A

inferior surface of the frontal lobes (orbital gyri)

frontal poles contact the anterior border of the anterior cranial fossa

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2
Q

what part of the brain rests in the middle cranial fossa

A

inferior surface of the temporal lobes

temporal poles in contact with anterior border of middle cranial fossa

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3
Q

what part of the brain rests in the posterior cranial fossa

A

inferior surface of the cerebellum

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4
Q

what part of the skull does the pons rest on

A

clivus

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5
Q

what makes up the roof of the posterior cranial fossa

A

tentorium cerebelli

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6
Q

what lobes of the brain do not rest in the floor of a cranial fossa

A

occipital

parietal

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7
Q

meninges

A

pia
arachnoid
dura

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8
Q

pia mater

A

very thin
closely adherent to brain
follows gyri and sulci

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9
Q

subarachnoid space filled with

A

CSF

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10
Q

what travels thru subarachnoid space

A

major arteries
cranial nerves
cortical veins

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11
Q

arachnoid mater

A

wispy projections down into subarachnoid space

arachnoid granulations project from here into dural venous sinuses

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12
Q

what travels through subdural space

A

bridging veins
arachnoid granulations

9both going to dural venous sinuses)

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13
Q

dura mater

A

double-layered membrane

occasionally these layers split to form dural venous sinuses

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14
Q

what makes up the falx and tentorium cerebelli

A

inner layer of dura mater

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15
Q

epidural space

A

forms periosteum of skull (closely adherent)

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16
Q

what travels through epidural space

A

meningeal arteries

17
Q

what does the lumbar cistern contain

A

CSF

where fluid is obtained in LP

18
Q

supratentorial

A

describes intracranial nervous tissue above the tentorium cerebelli

19
Q

infratentorial

A

describes intracranial nervous tissue below the tentorium cerebelli

20
Q

venous draining pattern in brain

A
  1. small veins within brain
  2. cortical surface veins in subarachnoid space
  3. bridging veins in subdural space
  4. dural sinuses
  5. internal jugular vein
21
Q

locations of dural venous sinuses

A
  1. where falx attaches to top of skull
  2. bottom of the falx
  3. where tentorium attaches to skull
22
Q

possible problems in venous system of brain

A

rupture of bridging veins
great cerebral vein (of Galen) can have a congenital aneurysm
infection in face/nasal sinuses can spread to venous sinuses

23
Q

CSF produced by

A

specialized leaky arterial blood vessels within ventricles (choroid plexus)

24
Q

CSF contains

A

water
protein
glucose
occasionally WBCs

25
flow of CSF
1. lateral ventricles 2. 3rd ventricle 3. 4th ventricle 4. squirts out holes in 4th ventricle into subarachnoid space 5. absorbed by arachnoid granulations 6. dumped back into blood stream via dural venous sinuses
26
function of CSF
provides a cushion of fluid for brain and spinal cord | washes out waste and toxins
27
blood brain barrier
capillaries in the brain have cell linings that are very close together prevents "bad" things in blood from getting to brain keeps fluctuations in electrolytes from occurring so neurons can function optimally
28
what can cross the blood brain barrier
meds that cause hyperactivity or hallucinations | alcohol, LSD
29
circumventricular organs
areas of brain where there is no blood brain barrier
30
examples of circumventricular organs
``` neurophpophysis/median eminence area postrema (AKA: CTZ)- vomit center ```