Ch.9 - Joints Flashcards
On what basis are joints classified?
Joints are classified on the basis of structural and functional classification. Structurally, joints can be fibrous, cartilaginous, or synovial. Functionally, joints can be synarthroses (immovable), amphiarthroses (partially moveable), or diarthroses (freely moveable).
How are the two types of fibrous joints similar? How do they differ?
Similar: Sutures and syndesmoses are both fibrous joints, meaning they lack a synovial cavity, and are made up of articulating bones held together by fibrous connective tissue and permit little to no movement.
Different: A suture is a FJ composed of a thin layer of dense fibrous CT that unites the skull bones. A type of suture is a synostosis, which is a suture joint that has ossified. On the other hand a syndesmoses is a FJ where there is more CT than in a suture. Type of synostosis is a gomphosis, which is a cone-shaped peg that fits into a socket allowing no movement (ex. Tooth), and an interosseous ligament, which is made up of a broad sheet of ligament that allows some movement between adjacent bones (ex. Between the radius and ulna).
