L6 Meninges and Arteries

Question 1

what does the subarachnoid space follow

Answer 1

fissures not sulci

Question 2

what is a cistern?

Answer 2

expansion of the subarachnoid space resulting from irregularity of the surface of the brain, which is lined by pia mater

Question 3

what layers is the superior sagital sinus between?

Answer 3

2 layers of dura - periosteal and meningeal dura

Question 4

arachnoid mater: vascular or avascular?

Answer 4

avascular

Question 5

pia mater: vascular or avascular?

Answer 5

highly vascular

Question 6

what is the falx cerebri

Answer 6

arched fold of dura mater that descends vertically in the longitudinal fissure between the cerebral hemispheres. - meningeal dural layer!

Question 7

where do cerebral hemorrhages lie?

Answer 7

between arachnoid mater and pia mater

Question 8

most dangerous hemorrhage in brain?

Answer 8

epidural

Question 9

which brain hemorrhage is difficult to address surgically?

Answer 9

subarachnoid hemorrhage

Question 10

what will pt with subarachnoid hemorrhage complain of?

Answer 10

terrible headache - blood is very irritating to meninges

Question 11

what ruptures with a intracerebral hemorrhage?

Answer 11

intraparenchymal branches of the subarachnoid a. = lenticulostriate a. – branch of middle cerebral a. supplying internal capsule and BG

ventricles dilate!

Question 12

what layer of meninges do spinal cords lack>

Answer 12

no periosteal dura!

Question 13

what 2 arteries anastomose to form the circle of willis at the basal diencephalon? what do they supply?

Answer 13

vertebral a. and internal carotid a.

basilar, cerebellar and cerebral a.

Question 14

where are all the brain vessels contained?

Answer 14

within subarachnoid space

Question 15

what artery feeds the middle and anterior cerebral a.?

Answer 15

internal carotid a.

Question 16

what branches do the middle cerebral a give off?

Answer 16

linticulaostriate a.

Question 17

what does the anterior communicating a. connect?

Answer 17

the two anterior cerebral a.

Question 18

where is a popular place for an aneurysm?

Answer 18

ant. communicating a. (very close to optic chasm)

Question 19

where do posterior cerebral a. come from?

Answer 19

basilar a.

Question 20

what does the middle cerebral a. supply?

Answer 20

lateral cerebral surface

Question 21

what does the ant. cerebral a. supply?

Answer 21

anteromedial cerebral surface

Question 22

what does the post. cerebral a. supply?

Answer 22

posteromedial cerebral surface

Question 23

what a. supplies the anterior and posterior spinal a.?

Answer 23

spinal medullary arteries – segmental branches of vertebral a. and aorta

Question 24

which is more vulnerable ant or post spinal a?

Answer 24

anterior

Question 25

how much of my body weight is my brain?

Answer 25

2%

Question 26

how much of CO is contributed to brain?

Answer 26

15%

Question 27

how much oxygen does the brain consume?

Answer 27

20%

Question 28

what is the flow of blood in brain?

Answer 28

750-1000 ml/min

Question 29

what controls cerebral blood flow>

Answer 29

``` metabolic control - pH, pCO2, adenosine, glycolytic products, extracellular K+ neurogenic control - sympathetic - parasympathetic - trigeminal peripheral CO2 autoregulation ```

Question 30

What happens if you mess with the vertebral a.?

Answer 30

You mess with medullary pyramid = motor = one side of the body will go weak

Question 31

Say the middle cerebral a. Ruptures and kills the left side of the brain. Which side of the body will it affect?

Answer 31

The right side...