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What covers and protects the brain?
Question Date: 2015-08-18
Answer 1:

The human brain is a soft, spongy collection of tissues and nerve cells. The main thing that protects the human brain is the bone of the skull encasing it. Then, there are three layers of membrane, called meninges that also aid in covering and protecting the brain. The three layers are the dura mater, arachnoid mater, and pia mater. The dura mater is closest to the bone, the arachnoid is in the middle and loosely surrounds the brain, and the pia mater is closest to the brain and attached to the spinal cord surface. Finally, the cerebrospinal fluid, a clear body fluid, also cushions the brain.

Answer 2:

Depends on the animal; many have no protection. Arthropods such as insects have their hard, chitinous exoskeleton over their entire bodies, including their brains, while vertebrates have a skull of some kind (although it may be cartilage). Snails and most worms have effectively no protection.

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