Answer :
Final answer:
Most bones in the skull articulate at an immobile suture. However, the mandible (or lower jaw bone) articulates at a synovial joint, which is a type of movable joint characterized by a fluid-filled space between the bones. This joint allows for the mobility of the mandible, such as when we talk or chew.
Explanation:
Most bones in the skull articulate at a suture, which is a type of immobile joint characterized by the absence of a synovial cavity; its bones are held together by fibrous connective tissue. The type of joint in question is called a synovial joint, and it presents a synovial cavity between the articulating bones.
The mandible or lower jaw bone, however, is a unique facial bone that articulates at a joint rather than a suture. This joint, known as the temporomandibular joint, is indeed a synovial joint.
Unlike sutures (which are tightly bound and allow little or no movement), synovial joints are characterized by a fluid-filled space between the bones that allows for free movement. For example, the mandible moves freely when we talk, chew, or open our mouths wide. This mobility of the mandible is facilitated by the presence of the synovial joint, which defines it as different from other facial bones.
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