Cns 3 - Cerebrospinal Fluid (Csf) System

Front 1

What is the ventricular system derived from?

Back 1

the lumen of the neural tube

Front 2

CSF is created by what?

Back 2

choroid plexus, located in each of the 4 ventricles

Front 3

What is the choroid plexus made up of?

Back 3

richly vascularized tissue

Front 4

What is the flow of CSF through the ventricular system?

Back 4

Left lateral ventricle in the left cerebral hemisphere OR right lateralventricle in the right cerebral hemisphere

—> left or right foramen of Monro, at the anterosuperior corner of thethalamus —> third ventricle between left and right thalami —> cerebral aqueduct in the midbrain —> fourth ventricle

Front 5

CSF exits the fourthventricle in one of four directions:

Back 5

1. into the central canal ofthe spinal cord,

2. through the foramen ofLuschka into the cisterns magnum,

3. through the left and rightforamina of Luschka into the prepontine cistern

Front 6

CSF flows downward in the central canal and then exits where and then ascends to where?

Back 6

exits the lower end of the spinal cord,

then ascends in subarachnoid space first ofthe spinal cord and then brain

Front 7

CSF moves through subarachnoidspace by what 2 ways?

Back 7

directly upward through thesubarachnoid space and the cisterns, located along the upward path

OR first downward around thespinal cord and then upward, joining the flow in the above way

Front 8

CSF enters the arachnoidgranulations, which project from subarachnoid space up into what?

Back 8

the superior sagittal sinus

OR venous lacunae, lateral projections of that sinus

Front 9

Arachnoid granulations movethe CSF into where and how?

Back 9

venous lacunae or thesuperior sagittal sinus

by acting as one-way valves

Front 10

CSF resorbed in the lacunaeflows where?

Back 10

into the superior sagittal sinus

Front 11

Venous blood in the superiorsagittal sinus drains through what and to where?

Back 11

drains through the dural venous sinuses to the internal jugular vein

Front 12

The cisterna magnum occupies what?

Back 12

the anglebetween posterior medulla and the inferior cerebellum

Front 13

Where is the prepontine cistern?

Back 13

in front of thepons and medulla

Front 14

Where is the Interpeduncularcistern?

Back 14

from thecerebral peduncles forward to the optic chiasm and dorsum sella

Front 15

Where is the Quadrigeminalcistern?

Back 15

between abovesuperior cerebellum, behind colliculi of the midbrain, below splenium of thecorpus callosum

Front 16

What does the lumbar cistern contain, and what is it used for?

Back 16

containsthe cauda equine of the spinal cord;

used for spinal taps

Front 17

Compared to blood plasma, what is the glucose and protein concentration of CSF?

Back 17

CSF has a lower glucose concentration and a much lowerprotein concentration

Front 18

What are the 3 functions of CSF?

Back 18

reducesthe effective weight of the brain using buoyancy,

Transportsneuroactive substances throughout CNS,

and removestoxic substances from the brain

Front 19

Resorption of CSF is aided by what?

Back 19

suction

Front 20

Where does CSF get resorbed into?

Back 20

superior sagittal sinus

Front 21

Suction is created by what 2 things?

Back 21

gravity pulling on the bloodin the internal jugular vein,

and stiff walls of the venoussinuses conveying that suction up through the dural venous sinuses

Front 22

Loss of CSF does what?

Back 22

reduces the buoyant force,supporting the brain

Front 23

What happens if the brain sags and stretches the dura?

Back 23

headaches typically result

Front 24

What are the 2 types of hydrocephalus?

Back 24

Communicating and noncommunicating

Front 25

What does the communicating hydrocephalus enlarge and why?

Back 25

enlargesall the CSF containing spaces because this hydrocephalus is due to the restrictionof CSF uptake by the arachnoid granulations

Front 26

What is the common cause of communicating hydrocephalus?

Back 26

calcification during aging

Front 27

What does the noncommunicating hydrocephalus enlarge and why?

Back 27

enlargeonly CSF-containing spaces upstream of the blockage/stenosis

Front 28

What are the 2 most common locations for blockage from noncommunicating hydrocephalus, and what do they enlarge?

Back 28

cerebral aqueduct - enlargingonly lateral and third ventricles;

aperaturesof Magendie and Luschka — enlarging all of the ventricular system, but not the subarachnoid spaces and cisterns

Front 29

Not on test from here down

What are the 5 parts of the lateral ventricle?

Back 29

2 central parts - body and trigone;

3 horns - inferior, anterior, and posterior horn

Front 30

Not on test

Where is the body of the lateral ventricle located?

Back 30

just above the thalami

Front 31

Not on test

Where is the trigone located?

Back 31

a little posterolateral tothe pulvinar of the thalamus

Front 32

Not on test

How does the inferior horn travel?

Back 32

descends anterolaterally from the trigone into temporallobe

Front 33

Not on test

How does the anterior horn travel?

Back 33

projects from the body ofthe lateral ventricle into the frontal lobe

Front 34

Not on test

The border between the anterior hornand the body is what?

Back 34

a coronal plane through the foramen of Monro

Front 35

Not on test

How does the posterior horn travel?

Back 35

projects from the trigone into the occipital lobe

Front 36

Not on test

What does the caudate contribute to? 2 things but then get more specific

Back 36

the lateral walls - of the 3 more superior parts of the lateral ventricle: anterior horn, body, and trigone;

the roof - inferior horn

Front 37

Not on test

The part of the caudate in the lateral wall of the anterior horn that isparticularly large is called what?

Back 37

head of the caudate

Front 38

Not on test

What are the onecontinuous memory-related structures called? 3 things

Back 38

fornix,

fimbria,

and hippocampus

Front 39

Not on test

The continuous structure contributes to what?

Back 39

medial wall - of the body and inferior horn,

floor - of the trigone,

or nothing - to the anterior horn

Front 40

Not on test

What happens at the foramen of Monro in regards to the fornix?

Back 40

it changes name from bodyto columns of the fornix and bends to go to the mammillary bodies

Front 41

Not on test

Wha tis the Amygdaloidcomplex continuous with and where?

Back 41

the stria terminalis and justanterior to the inferior horn

Front 42

Not on test

The internal capsule travels how?

Back 42

startsout above the midbrain with fibers, and disperses as it rises

Front 43

Not on test

By the level of the foramenof Monro, the internal capsule is arched with what three parts?

Back 43

Genu of the internal capsule,

its anterior limb,

its posterior limb

Front 44

Not on test

Where do the anterior and posterior limb travel to?

Back 44

Both start out connected to the genu but the

anterior limb travels to the head of the caudate;

the posterior limb travels to the thalamus