[3] Human cranial arachnoid trabeculae are made mostly of type I collagen.

[7] Some authors describe the structures in the subarachnoid space as having three forms, namely "trabeculae", "septa" and "pillars".

[8][9][10][11] The arachnoid trabeculae structures of humans and rats have been shown to have similar morphology.

The region-dependence of trabeculae volume fraction has a strong influence on the magnitude and distribution of brain deformation in the event of head impact.

The initial development of the subarachnoid space occurs in two phases:[13] Above the subarachnoid space, collagen fibers from the trabeculae are attached to the arachnoid mater, reinforcing it with collagen to withstand fairly strong forces.