anterior commissure

A bundle of myelinated nerve fibers passing transversely through the lamina terminalis and connecting symmetrical parts of the two cerebral hemispheres; it consists of a smaller anterior part (pars anterior commissurae anterioris) and a larger posterior part (pars posterior commissurae anterioris). Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the anterior commissure is

A bundle of myelinated nerve fibers passing transversely through the lamina terminalis and connecting symmetrical parts of the two cerebral hemispheres; it consists of a smaller anterior part (pars anterior commissurae anterioris) and a larger posterior part (pars posterior commissurae anterioris). The atlas records it as a nerve at the organ scale in the human body.

Where the anterior commissure is

It sits within the nervous system. 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 anterior commissure connects to

The atlas records 10 typed relationships for it, across 4 kinds of connection. part of brain, regional part of brain and telencephalon.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the anterior commissure. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as anterior cerebral commissure, commissura anterior cerebri, commissura rostralis, AC, anterior commissural nucleus and commissura anterior, and 4 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0000935, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: brain, regional part of brain and telencephalon.
• A kind of: intercerebral commissure, nervous system commissure and tract of brain.
• contributes to morphology of: anterior commissure anterior part and posterior part of anterior commissure.
• contains: anterior commissure anterior part and posterior part of anterior commissure.

Questions

Where is the anterior commissure?

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

What does the anterior commissure connect to?

Part of: brain, regional part of brain and telencephalon.

Is the anterior commissure 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.