Final answer:
Yes, the upper jaw is involved in a type of fibrous joint known as a gomphosis, which firmly anchors teeth in their sockets via the periodontal ligament and is classified as a synarthrosis, indicative of minimal movement.
Step-by-step explanation:
The upper jaw is indeed a part of a type of fibrous joint called a gomphosis. This unique joint functions as the connection between the teeth and their sockets. Specifically, a gomphosis anchors the root of a tooth into its bony socket within the maxillary bone (upper jaw) or mandible bone (lower jaw). In a gomphosis, the tooth fits into the socket like a peg, held firmly in place by a connective tissue called the periodontal ligament. Due to the minimal movement allowed by this type of joint, a gomphosis is classified as a synarthrosis, which refers to an immovable or slightly movable joint. Other types of fibrous joints include sutures, which are found only in the skull and syndesmoses, such as the joint between the tibia and fibula in the ankle.