arachnoid mater

A think avascular meningeal layer, between the pia mater and the dural mater. It is separated from the pia mater by the subarachnoid space. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the arachnoid mater is

A think avascular meningeal layer, between the pia mater and the dural mater. It is separated from the pia mater by the subarachnoid space. The atlas records it as a organ at the organ scale in the human body.

Where the arachnoid mater is

It sits within the nervous system. Positioned deliberately as part of this species body plan.

What the arachnoid mater connects to

The atlas records 8 typed relationships for it, across 4 kinds of connection. a kind of leptomeninx.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the arachnoid mater. 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 arachnoid, arachnoid mater of neuraxis, arachnoid membrane and arachnoidea mater. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002362, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• A kind of: leptomeninx.
• Adjacent to: subarachnoid space and subdural space.
• contains: arachnoid barrier layer, arachnoid trabecula and arachnoid villus.
• subtype: brain arachnoid mater and spinal cord arachnoid mater.

Questions

Where is the arachnoid mater?

It sits within the nervous system. Positioned deliberately as part of this species body plan.

What does the arachnoid mater connect to?

A kind of: leptomeninx.

Is the arachnoid mater 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.