Meninges, Ventricles, and CSF

Question 1

Meningeal Coverings

Answer 1

Dura Mater
Arachnoid Mater
Pia Mater

Question 2

Dura Mater

Answer 2

2 layers (periosteal and meningeal)
Spaces (epidural and subdural)
Dural Reflections
Dural venous sinuses

Question 3

Arachnoid Mater

Answer 3

Arachnoid trabeculae
Subarachnoid space
- Subarachnod cisterns
- Arachnoid villi (granulations)

Question 4

Dura Mater - Subdural and Epidural Spaces

Answer 4

Potential spaces

can bleed into these and will be “eipdural hematoma” or “subdural”

Question 5

Arachnoid Mater - Subarachnoid Space

Answer 5

Real space

Question 6

Subdural Hematoma

Answer 6

Crescent moon shape
Will not extend into the other hemisphere
Falx Cerebri is sitting there and prevents it from doing so

Question 7

Epidural Hematoma

Answer 7

Will bleed into other hemisphere

Question 8

Falx Cerebri

Answer 8

Btw the two hemispheres

Question 9

Tentorium Cerebelli

Answer 9

Covers the cerebellum

Question 10

Falx Cerebelli

Answer 10

Btw the two cerebellar hemispheres

Question 11

Purpose of dural reflections

Answer 11

they hold the venous system, prevent some movement, and separate things out
Help maintain and protect system - allows some openings

Question 12

Sinuses

Answer 12

Superior sagittal sinus
Inferior sagittal sinus
Straight sinus
Transverse sinus
Sigmoid sinus
Confluence of sinuses

Question 13

Sinuses go out the…

Answer 13

jugular foramen

Question 14

Arachnoid Mater - Arachnoid Trabeculae

Answer 14

Mater overlies the brain and does NOT enter the sulci

Trabeculae

Question 15

Subarachnoid Space

Answer 15

Actual fluid-filled space

Question 16

Subarachnoid Cisterns

Answer 16

Little space/indentation or pouches

Named for location

Question 17

4 cisterns

Answer 17

1. Superior Cistern (cistern of great cerebral vein) - good to drain here
2. Interpeduncular Cistern
3. Pontine Cistern
4. Cisterna Magna (cerebellomeduallary)

Question 18

Arachnoid Villi (granulations)

Answer 18

Helps us remove excess CSF and get it back into venous circulation
If stopped this system we would have a build up of CSF

Question 19

Pia Mater

Answer 19

Very closely invested to surface of brain and into each and every sulcus

Question 20

Ventricles

Answer 20

2 lateral ventricles
third ventricle
fourth ventricle

Question 21

Lateral Ventricles

Answer 21

C-shaped course through all the lobes of the cerebral hemispheres
Interventricular foramen —> 3rd

Question 22

Third Ventricle

Answer 22

Located in the midline region of diencephalon
Cerebral aqueduct (in midbrain) --> 4th

Question 23

Fourth Ventricle

Answer 23

Btw cerebellum post and pons and rostral medulla
Median aperture
Lateral aperture

Question 24

Parts of the lateral ventricle

Answer 24

Frontal horn
Body
Occipital horn
Atrium (trigone - junction)
Termoral horn (inf)
Intercentricular foramen

Question 25

NO choroid plexus

Answer 25

in cerebral aqueduct

Question 26

Third Ventricle - cerebral aqueduct

Answer 26

Narrowest portion of this system | do NOT want choroid plexus here - would lead to brain squishing up to the skull

Question 27

Fourth Ventricle - parts

Answer 27

``` Median Aperture (Magendie) Lateral Aperture (Luschka) Continuous with the central canal of spinal cord ```

Question 28

CSF - formed by..

Answer 28

Choroid plexus - highly convoluted and vascular membranous material that produces and secretes CSF

Question 29

Function of CSF

Answer 29

Supportive Control of extracellular fluid Provides a route for neuroactive hormones

Question 30

Which arteries supply the choroid plexus

Answer 30

Anterior and Posterior Choroidal arteries

Question 31

How choroid plexus works...

Answer 31

we do not want RBCs in the CSF so we filtrate them out | Capillaries keep RBCs then CSF continues through pia mater and through the choroid epithelium --> CSF

Question 32

Choroid plexus found in

Answer 32

all of the ventricles

Question 33

BBB

Answer 33

Anatomical and physiological complex that controls movememnt of substances from general extracellular fluid of the body to the extracellular fluid Very picky - only wants glucose and oxygen

Question 34

Structure of the BBB

Answer 34

1. Blood arachnoid layer 2. Blood CSF layer 3. True BBB - tight junctions of the endothelial cells of the cerebral capillaries

Question 35

True BBB

Answer 35

Astrocyte - control access to the neurons | BBB is the sequence of the 3 though