Chapter 14: Cerebrospinal Fluid Flow (CSF) Pattern

what is a ventricle?

cavity in the brain

what are the names of the ventricles?

Let Tom Fight

1. lateral ventricle

2. third ventricle

3. fourth ventricle

how many lateral ventricles?

2

where is the lateral ventricle cavity located?

in the interior of each cerebral hemisphere--> thus, there are 2 lateral ventricles

which are the LARGEST of the ventricles?

the 2 lateral ventricles

what are the lateral ventricles separated by?

septum pellucidum

each lateral ventricle communicates with _____ via the ______

third ventricle; interventricular foramen of Monro

how many third ventricles?

1

the NARROW third ventricle is located where?

between the thalamus of each side

what does the third ventricle communicate with and by what?

fourth ventricle by the cerebral aqueduct of Sylvius

where is the cerebral aqueduct of sylvius located?

midbrain

how many fourth ventricles?

1

where is the fourth ventricle cavity located?

in the pons and medulla

what is the fourth ventricle continuous with?

the central canal of the medulla

the central canal of medulla is in turn continuous with?

the central canal of the spinal cord

what does the fourth ventricle open by?

means of ONE MEDIAN and TWO LATERAL apertures into the subarachnoid space

these apertures are the only means by which what occurs?

the CSF formed in the ventricles enters the subarachnoid space

what are certain sites in the ventricles lined with?

choroid plexus

what is the function of the choroid plexus?

to produce CSF

what is CSF?

a clear, colorless, acellular fluid, similar to blood plasma

what are the functions of CSF?

CUSH LYMPH ENVO

1. to cushion and support the brain and spinal cord

2. as a lymphatic system

3. as an environment for neurons

WHAT IS THE COURSE OF CSF?

1. where is the CSF formed?

in the 2 lateral ventricles by the choroid plexus

2. where does the CSF pass?

through the interventricular foramen of Monro

3. where does the CSF join?

it joins the CSF produced in the third ventricle

4. where does the CSF pass through?

cerebral aqueduct of Sylvius

5. where does the CSF join?

the CSF produced in the fourth ventricle

6. where does CSF pass?

through the apertures of the fourth ventricle- 2 foramen of LUSCHKA and 1 foramen of Magendie- INTO the subarachnoid space

7. where does CSF travel after it goes through the apertures of fourth ventricle?

upward around the brain and downward around the spinal cord

8. what does the fluid do after traveling around brain and spinal cord?

circulates and eventually enters the arachnoid granulations

9. what happens in the arachnoid granulations?

CSF is reasborbed and passes through the lateral lacunae

10. after passing through the lateral lacunae where does CSF drain?

into the superior sagittal sinus

11. after passing through the superior sagittal sinus where does it go?

into the venous system of the body