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Question 1

CSF - functions

Answer 1

1 - buoyancy, brain tissue is very fragile and would crush under its own weight w/o CSF
2 - cushion the brain from injury
3 - communication - hormones, nutrients, wasteprod, neurotransmitters

Question 2

where it the CSF produced

Answer 2

in the 4 ventricles’ roof in choroid plexus: ultrafiltration in capillary beds (CSF originate from blood)

Question 3

explain the circulation until the IVth ventricle

Answer 3

R/L lateral ventricles -> for. interventriculare -> IIIrd ventricle -> aquaductus cerebri -> IVth ventricle

lat ventricles at level of forebrain - telencephalon
IIIrd ventricle at level of diencephalon(thalamus)
aquaduct through midbrain - mesencephalon
IVth ventricle at level of hindbrain - rhomboencephalon

Question 4

explain the circulation after the IVth ventricle

Answer 4

the CSF will go through apertura lat/medius ventr quarti to either go into the subarachnoid space to cushion brain
or
to the subarachnoid space of spinal chord and canalis centralis

Question 5

reabsorption in the brain and spinal chord of CSF

Answer 5

dorsally into venous sinuses( dorsal saggital venous sinus) and later into systemic circulation through arachnoid villi
or
the CSF aroung cranial cerves and spinal nerves are reabsorbed by perineural lymphatics

in spinal chord reabs into blood vessals of spinal chord