Types of Joints

Types of Joints

Types of Joints Articular System series of joints that allow movement Arthrology study of joints Joint Articulation the connecting point of two

bones Two functions: allow motion and provide stability Articulation can be: Freely movable such as knee or hip AKA: Synovial Joints and Diarthrosis

Slightly movable such as ribs to sternum AKA: Cartilaginous Joints and Amphiarthroses Immovable such as the skull AKA: Fibrous Joints and synarthroses

Name of the joints typically are a combination of the bones connected Ex. Sternoclavicular jont (sternum and clavicle) Fibrous Joints Immobile Held closely together and only separated by

fibrous connective tissue Bones very close contact 3 Types of Fibrous Joints Sutures * thin layer of fibrous tissue unites bones

* fuse completely by adulthood * only found in skull Syndesmosis * slightly movable, connected by ligaments Ex: radius and ulna move as one

Gomphosis * fits in a socket, held by ligaments Ex: tooth in the alveolus socket Cartilaginous Joints Slightly movable Bones are connected

by fibrocartilage (specialized connective tissue with thick fibers) Example: Ribs to the sternum

Synovial Joints Move freely Ends of bones are covered by articular cartilage Separated by a joint cavity Most frequently injured Grouped in how they work

Components of joint enclosed in a joint capsule Outer layer ligaments holds bones together Inner layer synovial membrane produces synovial fluid

Synovial fluid: colorless, contains salts, fats, and other substances Provides lubrication Acts as a shock absorber and cushion between bones

Bursa sac full of synovial fluid, reduces the friction between tendons, ligaments, & bones Meniscus cartilaginous disc surrounded with fluid to reduce friction during movement and adds stability Pivot Joint

Bones that move around a central axis Creates a rotational movement Gliding Joint Bones make a sliding motion Move back & forth or side to side

Hinge Joint One bone has a convex surface which fits into a concave surface on the other bone Ellipsoidal (Condyloid) Joint Bones can move in many directions but can not rotate

Ball & Socket Joint One bone has rounded end that ends into a concave (socket) of another bone Widest range of movement Saddle Joint

Two bones with complementary shape, both have concave and convex regions

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