Straight sinus
Encyclopedia
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. It drains blood from the superior cerebellar veins
and inferior sagittal sinus
(at the center of the brain) to the confluence of sinuses
(at the back of the head by the internal occipital protuberance
). See diagram (at right): labeled in the brain as "SIN. RECTUS" (for Latin: sinus rectus).
The straight sinus (tentorial sinus) is situated where the falx cerebri
meets the midline of tentorium cerebelli
.
It forms from the confluence of the inferior sagittal sinus
and great cerebral vein (great vein of Galen). In cross-section it is triangular, contains a few transverse bands across its interior, and increases in size as it proceeds backward.
Superior cerebellar veins
The superior cerebellar veins pass partly forward and medialward, across the superior vermis, to end in the straight sinus and the internal cerebral veins, partly lateralward to the transverse and superior petrosal sinuses....
and inferior sagittal sinus
Inferior sagittal sinus
The inferior sagittal 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 to the straight sinus , which connects to the transverse sinuses...
(at the center of the brain) to the confluence of sinuses
Confluence of sinuses
The confluence of sinuses or torcular herophili is the connecting point of the superior sagittal sinus, straight sinus, and occipital sinus. It is found deep to the occipital protuberance of the skull. Blood arriving at this point then proceeds to drain into the left and right transverse sinuses...
(at the back of the head by the internal occipital protuberance
Internal occipital protuberance
Along the internal surface of the occipital bone, at the point of intersection of the four divisions of the cruciate eminence is the internal occipital protuberance. Running transversely on either side is a groove for the transverse sinus.-External links:*...
). See diagram (at right): labeled in the brain as "SIN. RECTUS" (for Latin: sinus rectus).
The straight sinus (tentorial sinus) is situated where 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....
meets the midline of tentorium cerebelli
Tentorium cerebelli
The tentorium cerebelli or cerebellar tentorium is an extension of the dura mater that separates the cerebellum from the inferior portion of the occipital lobes.-Anatomy:...
.
It forms from the confluence of the inferior sagittal sinus
Inferior sagittal sinus
The inferior sagittal 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 to the straight sinus , which connects to the transverse sinuses...
and great cerebral vein (great vein of Galen). In cross-section it is triangular, contains a few transverse bands across its interior, and increases in size as it proceeds backward.