Which part of the skull houses the brain?

The cranial cavity is the correct answer because it is specifically designed to protect and house the brain. This cavity is formed by the bones of the skull, which create a rigid, bony enclosure that safeguards the brain from physical damage and provides a supportive environment for its function.

The other options refer to areas or structures related to the skull but do not serve the same purpose. The facial skeleton involves the bones that make up the face and does not include the parts that protect the brain. The foramen magnum is an important opening in the skull that allows the spinal cord to connect with the brain, but it is not where the brain resides. The zygomatic arch is a bony structure that forms the prominence of the cheek and does not play a role in housing or protecting the brain. Thus, the cranial cavity is the distinct and correct choice, as it is specifically dedicated to enclosing and safeguarding the brain.