Ventricular system, Choroid plexus, CSF

Question 1

*Choroid plexus

Answer 1

produces CSF

Question 2

The ventricular system is embryonically derived from…?

Answer 2

The neural tube

Question 3

Where is the ventricular system in the spinal cord?

Answer 3

the central canal

Question 4

Location of the lateral ventricle

Answer 4

In the cerebral hemispheres

Question 5

The lateral ventricle is derived embryonically derived from…

Answer 5

telencephalon

Question 6

*interventricular foramen

Answer 6

Connects the lateral ventricle (body) and the third ventricle

Question 7

List the parts of the lateral ventricle

Answer 7

Frontal (anterior) horn
Body
Temporal (inferior) horn
Occipital (posterior) horn
Trigone (atrium)

Question 8

*Septum pellucidum

Answer 8

Thin sheet that spans between the corpus callosum
and fornix in the midline
Separates the anterior horns of the two lateral
ventricles

Question 9

Does the body of the lateral ventricle contain choroid plexus?

Answer 9

Yes

Question 10

Does the occipital (posterior) horn of the lateral ventricle contain choroid plexus?

Answer 10

No

Question 11

Does the temporal (inferior) horn of the lateral ventricle contain choroid plexus?

Answer 11

Yes

Question 12

Does the trigone (atrium) horn of the lateral ventricle contain choroid plexus?

Answer 12

Yes

Question 13

From what is the third ventricle derived embryonically?

Answer 13

diencephalon

Question 14

With what does the third ventricle communicate?

Answer 14

Communicates with the lateral ventricle: interventricular foramen
With the 4th ventricle: cerebral aqueduct

Question 15

Does the third ventricle contain choroid plexus?

Answer 15

Yes in it’s roof

Question 16

From what is the cerebral aqueduct derived embryonically?

Answer 16

mesencephalon

Question 17

Location of the cerebral aqueduct

Answer 17

in the midbrain

Question 18

Does the cerebral aqueduct contain choroid plexus?

Answer 18

NO

Question 19

Does the 4th ventricle contain choroid plexus?

Answer 19

Yes

Question 20

How is the choroid plexus formed?

Answer 20

Formed by the invagination of the pia mater into the ventricles

Question 21

*CSF

Answer 21

Clear, colorless, acellular fluid located in the cranial and spinal subarachnoid spaces and ventricular system
of the brain

Question 22

Functions of the CSF

Answer 22

Buoyancy
The actual mass of the human brain is about 1400 grams; however, the net weight of the brain suspended in the CSF is equivalent to a mass of 25 grams.
The brain therefore exists in neutral buoyancy, which allows the brain to maintain its density without being impaired by its own weight.
Protection
CSF protects the brain tissue from injury when jolted or hit.
Chemical stability
CSF flows throughout the inner ventricular system in the brain and is absorbed back into the bloodstream, rinsing the metabolic waste from the central nervous system (CNS) through the blood-brain barrier. This allows for homeostatic regulation of the distribution of neuroendocrine factors, to which slight changes can cause problems or damage to the nervous system.
Waste removal
CSF is critical in the brain’s glymphatic system, the functional waste clearance pathway for the vertebrate CNS
Prevention of brain ischemia
Decreasing the amount of CSF in the limited space inside the skull decreases total intracranial pressure and facilitates blood perfusion.

Question 23

*Hydrocephalus

Answer 23

Dilation of the cerebral ventricles caused by
blockage of the CSF flow.
Characterized by excessive accumulation of CSF in
the cerebral ventricles or subarachnoid space