Ventricular system and CSF circulation

Question 1

what are the four ventricles?

Answer 1

two lateral ventricles
third ventricle
fourth ventricle

Question 2

what do the ventricles contain

Answer 2

CSF

Question 3

Where is the interventricular foramen located?

Answer 3

between the lateral and third ventricles

Question 4

where is the cerebral aqueduct located?

Answer 4

between the third and forth ventricles

Question 5

what are the lateral apertures?

Answer 5

where CSF exits the ventricular system from the fourth ventricle

Question 6

lateral ventricles

Answer 6

made body plus three horns: anterior, inferior and posterior horn

Question 7

Choroid plexus (relative to lateral ventricle)

Answer 7

goes into the body and the inferior horn of the lateral ventricles

Question 8

third ventricle

Answer 8

a narrow cavity that sits adjacent to the thalamus

Question 9

choroid plexus (relative to the third ventricle)

Answer 9

sit in the third ventricle’s roof

Question 10

fourth ventricle

Answer 10

lies between the cerebellum posteriorly and the pons & medulla anteriorly. the roof of the fourth ventricle is formed by the superior medullary velum and inferior medullary velum. the floor o formed by the brainstem

Question 11

what are the three openings of the fourth ventricle?

Answer 11

two lateral apetures (foramina of Luschka) and one median aperture (foramen of magendie)

Question 12

CSF

Answer 12

the clear liquid that fills cerebral ventricles and the spinal canal, as well as the subarachnoid space

Question 13

what produces CSF

Answer 13

choroid plexus

Question 14

how much CSF does the brain produce a day

Answer 14

about 500mL

Question 15

what is the function of the CSF?

Answer 15

to allow buoyancy, protection and chemical stability

Question 16

what is the flow of the CSF?

Answer 16

Lateral ventricles → via the interventricular foramen → third ventricle → cerebral aqueduct → fourth ventricle → exits via either the median aperture or lateral apertures
median → goes down the central canal → exits
lateral → goes up and around the cerebellum → is transported via the arachnoid granulations → into the superior sagittal sinus → venous system for drainage.

Question 17

Hydrocephalus

Answer 17

excessive amount of CSF in the ventricular system. it can occur due to increased production of fluid, or disturbances in its circulation, or in absorption into the venous sinuses. the result is an enlarged head in a newborn baby