Question

CSF re-enters the bloodstream through _?_ that project into the _?_. (a) arachnoid villi, choroid plexuses...

CSF re-enters the bloodstream through _?_ that project into the _?_.

(a) arachnoid villi, choroid plexuses

(b) choroid plexuses, ventricles

(c) arachnoid villi, dural sinuses

(d) ependyma, ventricles

(e) none of these.

Science   Anatomy-And-Physiology   
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Answer #1

Answer c) Arachnoid villi ,Dural sinuses

Normally CSF is produced from Choroid plexus lining the Ventricles .From lateral Ventricle CSF enters into third Ventricle through Foramen of Monroe and from third ---->Fourth ventricle through Iter or acqueduct of Sylvis.From Fourth ventricle it is reabsorbe through Arachnoid granulation ( Arachnoid Villi ) which enters into Subdural venous sinuses and in this Way CSF reaches from Lateral Ventricles to Blood stream ( Subdural venous system ) via Arachnoid Villi ( Granulations ) .

Obstruction at any one of the passage result in HYDROCEPHALUS.

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