The arachnoid villi responsible for cerebrospinal fluid absorption protrude mainly in the:
A. Superior saggital sinus
B. Inferior saggital sinus
C. Straight sinus
D. Transverse sinus
Answer is A: Superior saggital sinus.
The arachnoid villi are projections of the arachnoid matter into the venous sinuses. These villi are most numerous in the superior saggital sinus.
CSF is produced in the brain by modified ependymal cells in the choroid plexus (approx. 50-70%), and the remainder is formed around blood vessels and along ventricular walls. It circulates from the lateral ventricles to the foramen of Monro, third ventricle, aqueduct of Sylvius, fourth ventricle, foramina of Magendie and Luschka; subarachnoid space over brain and spinal cord; reabsorption into venous sinus blood via arachnoid granulations.
An interesting poster with a summary of CSF is located here.
A. Superior saggital sinus
B. Inferior saggital sinus
C. Straight sinus
D. Transverse sinus
Answer is A: Superior saggital sinus.
The arachnoid villi are projections of the arachnoid matter into the venous sinuses. These villi are most numerous in the superior saggital sinus.
CSF is produced in the brain by modified ependymal cells in the choroid plexus (approx. 50-70%), and the remainder is formed around blood vessels and along ventricular walls. It circulates from the lateral ventricles to the foramen of Monro, third ventricle, aqueduct of Sylvius, fourth ventricle, foramina of Magendie and Luschka; subarachnoid space over brain and spinal cord; reabsorption into venous sinus blood via arachnoid granulations.
An interesting poster with a summary of CSF is located here.
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