Question at position 1 Following a subarachnoid hemorrhage, a patient presents with severe headache. Blood is putting pressure on the innermost meningeal layer that closely adheres to the surface of the brain. Which meningeal layer lies directly adjacent to the brain tissue?Dura materPia materArachnoid mater

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Question at position 1 Following a subarachnoid hemorrhage, a patient presents with severe headache. Blood is putting pressure on the innermost meningeal layer that closely adheres to the surface of the brain. Which meningeal layer lies directly adjacent to the brain tissue?Dura materPia materArachnoid mater

BlackTom AI · Accepted Answer

The question asks which meningeal layer is directly adjacent to brain tissue, i.e., the layer that lies closest to the brain itself.
Option 1: Dura mater. The dura mater is the outermost, tough protective layer that lines the skull, not directly adherent to brain tissue. It sits outside the arachnoid mater and separates from the brain, so this option is incorrect for the layer directly contacting the brain.
Option 2: Pia mater. The pia mater is the delicate innermost layer that adheres intimately to the brain’s surface, following all the contours of the gyri and sulci. This is the layer that lies directly on the brain tissue, making it the correct choice for the described location.
Option 3: Arachnoid mater. The arachnoid mater is the middle, web-like layer between the dura and pia. It does not contact the brain tissue directly but sits between the pia and dura, separated from the brain by the subarachnoid space containing cerebrospinal fluid. Therefore, it is not the layer directly adjacent to brain tissue.
In summary, understanding the anatomical arrangement from outer to inner membranes is: skull, dura mater, arachnoid mater, and pia mater, with the pia mater directly contacting the brain. This confirms why the pia mater is the layer described in the question.

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