Inferior sagittal sinus
Inferior Sagittal Sinus
The Inferior Sagittal Sinus (pronounced: in-fee-ree-or saj-i-tl si-nus) is a dural venous sinus located in the free edge of the falx cerebri, a sickle-shaped fold of dura mater in the brain.
Etymology
The term "Inferior Sagittal Sinus" is derived from Latin and Greek roots. "Inferior" comes from the Latin 'inferus' meaning 'lower', "Sagittal" is derived from the Latin 'sagitta' meaning 'arrow', and "Sinus" is from the Latin 'sinus' meaning 'bend' or 'curve'.
Anatomy
The Inferior Sagittal Sinus is smaller and less consistently present compared to the Superior Sagittal Sinus. It begins near the crista galli, a small upward bony projection off the cribriform plate at the frontal part of the skull, and runs posteriorly to join the Straight Sinus at the confluence of sinuses, also known as the torcular Herophili.
Function
The Inferior Sagittal Sinus drains the medial and inferior parts of the cerebral hemispheres and the falx cerebri. It primarily drains into the Straight Sinus, which then continues as the Transverse Sinus.
Related Terms
- Dural venous sinuses: Channels that drain blood from the brain.
- Falx cerebri: A sickle-shaped fold of dura mater in the brain.
- Superior Sagittal Sinus: A dural venous sinus located superior to the Inferior Sagittal Sinus.
- Straight Sinus: A dural venous sinus that the Inferior Sagittal Sinus drains into.
- Transverse Sinus: Continuation of the Straight Sinus.
- Torcular Herophili: The confluence of sinuses where the Superior Sagittal, Straight, and Transverse Sinuses meet.
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