Final answer:
A fibrous joint that is a "peg in socket" arrangement is called a (b) gomphosis, which is a type of joint specifically anchoring a tooth in its bony socket in the jaw.
Step-by-step explanation:
The fibrous joint that is a "peg in socket" arrangement and anchors a tooth to its socket in the jaw is called a gomphosis. Sutures and syndesmoses are two other forms of fibrous joints. Specifically, sutures are found only in the skull and functionally classified as synarthrosis because they allow minimal movement, whereas syndesmoses involve a ligament or an interosseous membrane connecting long bones, such as those in the forearm or leg, allowing for some movement, based on the length of the connective tissue fibers.
Distinguish between these types of fibrous joints:
- Sutures - Connect the bones of the skull with short fibers of connective tissue, typically immobile. Example: the coronal suture of the skull.
- Syndesmoses - Bones are connected by ligaments, allowing more movement than sutures. Example: the joint between the tibia and fibula in the ankle.
- Gomphoses - The peg-in-socket fibrous joint between a tooth and its socket in the jaw, held by the periodontal ligament. Example: a tooth anchored in the maxillary bone or mandible.