Cranium: Anatomy, Structure & Function - A Comprehensive Guide

The cranium is the hard, protective bone structure that encloses and protects the brain and other delicate organs of the head. It consists of a series of flat, curved and irregular bones that are joined together to form a rigid structure. The cranium is formed by a total of 22 bones, which include:

- Frontal bone: Forms the forehead and the upper portion of the eye sockets.

- Parietal bones: Two bones that form the sides and top of the cranium.

- Temporal bones: Located on the sides of the cranium and contain the structures of the inner ear and the temporomandibular joints (TMJ) that connect the jaw to the skull.

- Occipital bone: Forms the back of the cranium and connects to the first vertebrae of the spine.

- Sphenoid bone: A butterfly-shaped bone located at the base of the cranium that forms part of the eye sockets, nasal passages and pituitary gland fossa.

- Ethmoid bone: A thin, lightweight bone located between the eyes that forms part of the nasal septum and the upper portion of the nasal cavity.

These bones are connected to each other by joints called sutures, which are immovable and tightly interlocked. The cranium provides essential protection for the brain, allowing it to function safely within the skull. Additionally, it serves as a point of attachment for muscles of the face and head, and plays a role in hearing and balance.