Cranium, Ventricles, Meninges (Lecture #5)

Question 1

what part of the brain rests in the anterior cranial fossa

Answer 1

inferior surface of the frontal lobes (orbital gyri)

frontal poles contact the anterior border of the anterior cranial fossa

Question 2

what part of the brain rests in the middle cranial fossa

Answer 2

inferior surface of the temporal lobes

temporal poles in contact with anterior border of middle cranial fossa

Question 3

what part of the brain rests in the posterior cranial fossa

Answer 3

inferior surface of the cerebellum

Question 4

what part of the skull does the pons rest on

Answer 4

clivus

Question 5

what makes up the roof of the posterior cranial fossa

Answer 5

tentorium cerebelli

Question 6

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

Answer 6

occipital

parietal

Question 7

meninges

Answer 7

pia
arachnoid
dura

Question 8

pia mater

Answer 8

very thin
closely adherent to brain
follows gyri and sulci

Question 9

subarachnoid space filled with

Answer 9

CSF

Question 10

what travels thru subarachnoid space

Answer 10

major arteries
cranial nerves
cortical veins

Question 11

arachnoid mater

Answer 11

wispy projections down into subarachnoid space

arachnoid granulations project from here into dural venous sinuses

Question 12

what travels through subdural space

Answer 12

bridging veins
arachnoid granulations

9both going to dural venous sinuses)

Question 13

dura mater

Answer 13

double-layered membrane

occasionally these layers split to form dural venous sinuses

Question 14

what makes up the falx and tentorium cerebelli

Answer 14

inner layer of dura mater

Question 15

epidural space

Answer 15

forms periosteum of skull (closely adherent)

Question 16

what travels through epidural space

Answer 16

meningeal arteries

Question 17

what does the lumbar cistern contain

Answer 17

CSF

where fluid is obtained in LP

Question 18

supratentorial

Answer 18

describes intracranial nervous tissue above the tentorium cerebelli

Question 19

infratentorial

Answer 19

describes intracranial nervous tissue below the tentorium cerebelli

Question 20

venous draining pattern in brain

Answer 20

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

Question 21

locations of dural venous sinuses

Answer 21

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

Question 22

possible problems in venous system of brain

Answer 22

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

Question 23

CSF produced by

Answer 23

specialized leaky arterial blood vessels within ventricles (choroid plexus)

Question 24

CSF contains

Answer 24

water
protein
glucose
occasionally WBCs

Question 25

flow of CSF

Answer 25

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

Question 26

function of CSF

Answer 26

provides a cushion of fluid for brain and spinal cord

washes out waste and toxins

Question 27

blood brain barrier

Answer 27

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

Question 28

what can cross the blood brain barrier

Answer 28

meds that cause hyperactivity or hallucinations

alcohol, LSD

Question 29

circumventricular organs

Answer 29

areas of brain where there is no blood brain barrier

Question 30

examples of circumventricular organs

Answer 30

neurophpophysis/median eminence
area postrema (AKA: CTZ)- vomit center