The inferior sagittal sinus (also known as inferior longitudinal sinus), within the human head, is an area beneath the brain which allows blood to drain outwards posteriorly from the center of the head. It drains (from the center of the brain) to the straight sinus

Straight sinus

The straight sinus , within the human head, is an unpaired area beneath the brain which allows blood to drain from the inferior center of the head outwards posteriorly...

 (at the back of the head), which connects to the transverse sinuses

Transverse sinuses

The transverse sinuses , within the human head, are two areas beneath the brain which allow blood to drain from the back of the head. They run laterally in a groove along the interior surface of the occipital bone...

. See diagram (at right): labeled in the brain as "SIN. SAGITTALIS INF." (for Latin: sinus sagittalis inferior).

The inferior sagittal sinus courses along the inferior border of the falx cerebri

Falx cerebri

The falx cerebri, also known as the cerebral falx, so named from its sickle-like form, is a strong, arched fold of dura mater which descends vertically in the longitudinal fissure between the cerebral hemispheres....

, superior to the corpus callosum

Corpus callosum

The corpus callosum , also known as the colossal commissure, is a wide, flat bundle of neural fibers beneath the cortex in the eutherian brain at the longitudinal fissure. It connects the left and right cerebral hemispheres and facilitates interhemispheric communication...

.

It receives blood from the deep and medial aspects of the cerebral hemispheres and drains into the straight sinus

Straight sinus

The straight sinus , within the human head, is an unpaired area beneath the brain which allows blood to drain from the inferior center of the head outwards posteriorly...

.