Question

cerebrospinal fluid is secreted by choroid plexuses in the ventricles and reabsorbed by arachnoid granulations in the
multiple choice
superior sagittal sinus
reticular formation
central canal of the spinal cord
tegmentum
substantia nigra

Explanation:

Cerebrospinal fluid (CSF) is produced by the choroid plexuses in the ventricles of the brain. After circulating around the brain and spinal cord, it is reabsorbed. The arachnoid granulations are structures that protrude into the superior sagittal sinus (a large venous sinus in the brain). They allow the CSF to move from the subarachnoid space (where it circulates) into the venous blood within the superior sagittal sinus.

The reticular formation is a network of neurons in the brainstem involved in functions like consciousness and motor control. The central canal of the spinal cord is a small channel that contains CSF but is not the site of reabsorption. The tegmentum is part of the brainstem (in the midbrain, pons, etc.) involved in various functions like containing nuclei for cranial nerves. The substantia nigra is a part of the midbrain involved in motor control (especially related to dopamine - producing neurons, and degeneration is associated with Parkinson's disease).

Answer:

superior sagittal sinus