arachnoid membrane

A brain haemorrage is a type of stroke that can be fatal and occurs when there is bleeding on the surface of the brain, just below the arachnoid membrane.

In this disease, the pia mater, arachnoid membrane, or the brain itself, may be inflamed.

The arachnoid membrane was, in many parts, without its natural transparency: the pia mater was generally suffused with blood, and its vessels were enlarged: the consistence of the brain was firm.

The dura mater, the two leaves of the arachnoid membrane, and the pia mater did not constitute more than one membrane of the usual thickness, and presented a somewhat yellow colouring.