The only movable joint in the skull is the temporomandibular joint (TMJ), which allows movement of the mandible (lower jaw).
Understanding Skull Joints
The skull is comprised of multiple bones that are fused together. Most of these connections are immovable joints called sutures. These sutures provide stability and protection for the brain. However, the mandible is an exception.
The Temporomandibular Joint (TMJ)
- Location: The TMJ connects the mandible (lower jaw) to the temporal bone of the skull on each side of the head, just in front of the ears.
- Movement: This joint allows for a wide range of movements, including:
- Opening and closing the mouth
- Protrusion and retraction of the jaw
- Lateral (side-to-side) movement for chewing
- Importance: The TMJ is crucial for essential functions like:
- Speaking
- Eating
- Swallowing
Other Skull Joints (Sutures)
Sutures are fibrous joints found in the skull that are generally immovable. Examples include:
- Coronal Suture: Connects the frontal bone to the parietal bones.
- Sagittal Suture: Connects the two parietal bones.
- Lambdoid Suture: Connects the parietal bones to the occipital bone.
- Squamous Suture: Connects the parietal and temporal bones.
These sutures allow for slight movement during childbirth and typically fuse during adulthood.
