Day 3 - 5/30 Flashcards

1
Q

Dura mater

A

tough outer layer, keeping ventricle in place by skull and vertebral column

makes sure hemispheres do not bump

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2
Q

What is the point of a sinus?

A

“Storm sewer” - points at which used up fluid goes back to heart

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3
Q

What are the names of the two divisions when the dura mater outer layer splits?

A

falx cerebri (longitudinal fissure) and tantrum cerebelli

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4
Q

Where is the falx cerebri and fx?

A

in the longitudinal fissure

ensures the two hemispheres will not bump

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5
Q

Where is the tantrum cerebelli and fx?

A

cushions cerebellum over entire top of cerebellum

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6
Q

What is the order of the meninges from outside in?

A

dura –> arachnoid (subarachnoid) –> pia mater

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7
Q

Describe the arachnoid mater and fx.

A

contains a subarachnoid space where CSF actually circulates.

Villi poke through arachnoid into the superior sagittal sinus with tiny granulations for CSF to drain

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8
Q

What is Pia mater and fx?

A

very thin layer of connective tissue between arachnoid mater and NS. Closely to brain and SC.

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9
Q

What is CSF?

A

Similar to plasma of blood but without elements

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10
Q

Describe the circulation from heart and back to heart of CSF.

A

begin: heart –> ventricles 1 & 2 (always goes through choroid plexus in each ventricle to remove formed elements) –> interventircular foreamen –> third ventricle –> cerebral aqueduct –> fourth ventricle –> 2 lateral and 1 median foreamen –> subarachnoid space –> villi –> granulations –>superior sagittal sinus –> reabsorbed into blood stream through jugular vein –> end: heart

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11
Q

Hydrocephalus

A

Cerebral aqueduct gets squeezed – ventricles swell – cells shrink – eventually die if continually squeezed between CSF pathway and bone

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12
Q

Meningitis

A

penetrates dura mater and outer meninges –> inflammation –> extra CSF –> squeezing –> gets through pia mater and attacks NS cells of outer brain

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13
Q

Where does the underneath of the temporal lobe, occipital lobe and all of brainstem get blood supply from?

A

Posterior

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14
Q

Where does the frontal lobe, top of temporal and parietal get blood supply from?

A

Anterior

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15
Q

Describe the blood circulation of the anterior supply

A

aortic arch >vertebral Aa- in front of medulla > posterior inferior cerebellar A > vertebral Aa connect to form basilar A before pons > anterior inferior cerebellar A > anterior superior A > basilar splits into 2 at top of pons> posterior superior A

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16
Q

Describe the blood circulation of the posterior blood supply

A

internal carotid > splits into anterior and middle cerebellar Aa
Anterior - longitudinal fissure and supplies med. surface of frontal/parietal and limbic lobe

Middle - goes lateral and supplies lateral frontal/parietal and lateral/top of temporal