Which bone is primarily responsible for forming the forehead?

The bone primarily responsible for forming the forehead is the frontal bone. This bone occupies the front part of the skull and contributes to the structure of the forehead, eye sockets, and nasal cavity. It plays a significant role in the overall shape and contour of the face, providing the bony support needed for the forehead's features.

Understanding the anatomy of the skull is crucial for estheticians, as it aids in grasping how various facial treatments can affect the underlying bone structure. The frontal bone also interacts with other facial bones, influencing the aesthetic appearance of the forehead area.

The other bones listed do not contribute to the formation of the forehead in the same way that the frontal bone does. The temporal bone forms the sides and base of the skull, the mandible is the jawbone responsible for the lower face, and the sphenoid bone contributes to the base of the skull and is located deeper in the cranial cavity. Thus, the frontal bone's unique position and structure make it the sole bone responsible for the formation of the forehead.