Lecture 2: Ventricular system and function Flashcards
What ventricle separates the 2 telencephalons?
2 lateral ventricles
What separates the telencephalon from the diencephalon?
3rd ventricle
Dorsal separation and expansion of the metencephalon and myelencephalon create the____________
floor of the 4th ventricle
All parts of the lateral ventricle following expansion of the telencephalon is a part of the limbic lobe except the ______
posterior horn
What’s the bird’s eye?
interthalamic adhesion
What is the interventricular foramen better known as the foramen of Monro?
the connection of the lateral ventricle to the 3rd ventricle
-it allows flow of CSF between the two ventricles
- Importance of the brain-blood barrier (BBB)?
- Tight junction of ____________ cells in capillary.
protects the brain from harmful substances and maintains a stable environment for proper brain function.
-endothelial
Choroid plexus is ONLY in the __________
ventricles
Are the following statements true or false?
The BBB does not restrict movement between blood and the brain.
The Choroid plexus restricts controlled exchange of substances between blood and CSF.
false: BBB does restrict movement for protection
false: does not restrict controlled exchange
- How much active secretion of CSF daily?
- How much is maintained?
200-500 ml daily
150ml
What is the function of CSF: 6
maintains brain structure through buoyancy
decrease 97% gravity (140g-40g)
shock absorption
regulate chemical environment
waste exchange
nutrition
The brain will _________ without buoyancy which CSF creates.
collapse
Strict directional circulation entirely replaces CSF _______
1-3x daily
The circulation of CSF is affected by heart ventricular _______ and _______.
systole and diastole
What is the direction of CSF circulation during systole:
cranial-caudal direction –> out of ventricles (top to bottom)
What is the direction of CSF circulation during diastole:
caudal-cranial direction –> draining to superior sagittal sinus
If the CSF is blocked it can lead to ___________
hydrocephalus
The CSF mainly drains into the dural sinuses through a network of structures called ___________
arachnoid granulations
The following statement is true or false:
The arachnoid granulations act as a two-way valve, allowing CSF to flow from subarachnoid space into dural sinuses.
false: one-way valve: cant flow back from SSS
CSF ciruclation:
lateral venticle –> foramen of Monro —> 3rd ventricle —> cerebral aqueduct –> 4th ventricle —-> formania of luschka —> subarachnoid space over brain and spinal cord
-reabsorption into venous sinus blood via arachnoid granulations
Dura mater is the ___________ layer and is between: ________ & ______ , _______ space
outermost layer and between the arachnoid mater & skull, potential space
Which two layers form the dura mater:
periosteal and meningeal layers
The falx cerebri is the largest and most prominent fold which separates the ___________
2 cerebral hemispheres