Which cavity contains the brain?

• A. Cranial cavity
• B. Thoracic cavity
• C. Abdominal cavity
• D. Pelvic cavity

Answer: (A)

The brain is housed in the cranial cavity—the space inside the skull. This cavity is part of the dorsal body cavity and is specifically formed to protect the brain, with the skull bones, protective meninges, and cerebrospinal fluid providing cushioning and support. The other options refer to spaces in the ventral body cavities: the thoracic cavity holds the heart and lungs, the abdominal cavity contains most digestive organs, and the pelvic cavity includes reproductive and some urinary organs. None of these enclose the brain.