Which of the following is the correct order of the layers from the outside to the inside of the skull and brain?

The selection of the option that details the correct order of the layers from the outside to the inside of the skull and brain is based on an understanding of the anatomical structures. The correct answer progressively lists these layers starting from the outermost protective covering down to the brain itself.

The sequence starts with the skin, which is the external layer that covers the head. Underneath the skin, the skull provides the bony protection that encases the brain. After the skull, the dura mater—the toughest of the three meningeal layers—serves as a protective barrier and encloses the brain and spinal cord.

Beneath the dura mater lies the arachnoid mater, which is a web-like structure that also contributes to the protective covering of the brain. This layer is significant because it helps to facilitate the flow of cerebrospinal fluid. The subarachnoid space, which follows, is filled with cerebrospinal fluid (CSF) that cushions the brain and plays a role in maintaining intracranial pressure.

Finally, the pia mater, a delicate membrane, adheres closely to the surface of the brain itself, enveloping it and delivering blood vessels. This comprehensive structure is vital for protecting the brain from injuries and infections while also supporting