sigmoid sinus

A portion of the lateral venous sinus, bulging prominently into the mastoid cavity, that serves as a principal conduit by which blood leaves the cranium[EPIC]. The sigmoid is drained by the internal jugular vein. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the sigmoid sinus is

A portion of the lateral venous sinus, bulging prominently into the mastoid cavity, that serves as a principal conduit by which blood leaves the cranium[EPIC]. The sigmoid is drained by the internal jugular vein. The atlas records it as a organ at the organ scale in the human body.

Where the sigmoid sinus is

It sits in the head, within the cardiovascular and nervous systems. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What the sigmoid sinus connects to

The atlas records 6 typed relationships for it, across 4 kinds of connection. part of head.

Supply and innervation

Venous drainage: internal jugular vein, transverse sinus and vein of vestibular aqueduct.

Also called

Also recorded as sulcus sigmoideus. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0005475, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

Part of: head.
A kind of: paired venous dural sinus.
Connected to: marginal venous sinus.
drains to: internal jugular vein, transverse sinus and vein of vestibular aqueduct.

Questions

Where is the sigmoid sinus?

What does the sigmoid sinus connect to?

Part of: head.

Is the sigmoid sinus the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.