Ventricles Flashcards
Which cells line the ventricles?
glial cells (ependymal precisely)
What is the function of the ventricles?
circulation and storage of CSF, protection during accelerating and deccelerating movements
Where in the ventricles is CSF primarily produced?
choroid plexus
What are the points of connection between the ventricles?
Interventricular foramen (connects lateral to 3rd ventricle), cerebral aqueduct (3rd ventricle to 4th ventricles)
What are the openings in the fourth ventricle which lead to the subarachnoid space?
Foramina luschka (2) , foramina magendie
collateral trigone
region in lateral ventricles. Area with lot of choroid plexus.
cisterns
large pockets of CSF in the subarachnoid space. Largest is lumbar cistern
What is the order of circulation of the CSF?
Lateral ventricles–>3rd (via interventricular foramen), 3rd ventricle–>4th via cerebral acqueduct, 4th–>subarachnoid space (via foramina luschka and magendie), –> brain and spinal cord. Brain–> arachnoid granulations –> sinuses (superior sagittal sinus)
How is the CSF moved from arachnoid granulations to the sinuses?
Pressure differential–greater pressure in ventricle than sinus.
What happens if the sinuses have greater pressure than the ventricles?
CSF stops moving to ventricles, stops draining, intracranial pressure increases (CSF production always constant). One cause of hydrocephalus, called communicating hydrocephalus)
What causes noncommunicating/obstructive hydrocephalus?
Obstruction in flow of CSF from ventricles to subarachnoid space, at any level. Most common is cerebral aqueduct.
How is cerebrospinal fluid pressure measured?
lumbar puncture (needle inserted into lumbar subarachnoid space(lumbar cistern))
