Cranium, Ventricles, Meninges (Lecture #5) Flashcards Preview

Neuroanatomy > Cranium, Ventricles, Meninges (Lecture #5) > Flashcards

Flashcards in Cranium, Ventricles, Meninges (Lecture #5) Deck (30):
1

what part of the brain rests in the anterior cranial fossa

inferior surface of the frontal lobes (orbital gyri)
frontal poles contact the anterior border of the anterior cranial fossa

2

what part of the brain rests in the middle cranial fossa

inferior surface of the temporal lobes
temporal poles in contact with anterior border of middle cranial fossa

3

what part of the brain rests in the posterior cranial fossa

inferior surface of the cerebellum

4

what part of the skull does the pons rest on

clivus

5

what makes up the roof of the posterior cranial fossa

tentorium cerebelli

6

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

occipital
parietal

7

meninges

pia
arachnoid
dura

8

pia mater

very thin
closely adherent to brain
follows gyri and sulci

9

subarachnoid space filled with

CSF

10

what travels thru subarachnoid space

major arteries
cranial nerves
cortical veins

11

arachnoid mater

wispy projections down into subarachnoid space
arachnoid granulations project from here into dural venous sinuses

12

what travels through subdural space

bridging veins
arachnoid granulations

9both going to dural venous sinuses)

13

dura mater

double-layered membrane
occasionally these layers split to form dural venous sinuses

14

what makes up the falx and tentorium cerebelli

inner layer of dura mater

15

epidural space

forms periosteum of skull (closely adherent)

16

what travels through epidural space

meningeal arteries

17

what does the lumbar cistern contain

CSF
where fluid is obtained in LP

18

supratentorial

describes intracranial nervous tissue above the tentorium cerebelli

19

infratentorial

describes intracranial nervous tissue below the tentorium cerebelli

20

venous draining pattern in brain

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

locations of dural venous sinuses

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

22

possible problems in venous system of brain

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

CSF produced by

specialized leaky arterial blood vessels within ventricles (choroid plexus)

24

CSF contains

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