Florida Basic Recruit Training Program High Liability (First Aid) Practice Exam

What structure is attached to the skull and allows for movement of the jaw?

1. Hinged jawbone

2. Vertebrae

3. Sternum

4. Collarbone

The correct answer is: Hinged jawbone

The structure that is attached to the skull and allows for movement of the jaw is the hinged jawbone, also known as the mandible. The mandible articulates with the temporal bone of the skull at the temporomandibular joint (TMJ). This joint functions like a hinge, enabling the jaw to open and close, allowing for essential activities such as chewing, speaking, and making facial expressions. In contrast, the other options do not serve this function. The vertebrae are the individual bones that form the spine and do not play a role in jaw movement. The sternum, commonly known as the breastbone, is located in the chest and is involved with the rib cage, while the collarbone (clavicle) connects the arm to the body but is not involved in the movement of the jaw. Therefore, the hinged jawbone is the correct answer as it is specifically designed to facilitate movement at the jaw, enabling essential functions in everyday life.