SYNOVIAL JOINT.

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Presentation transcript:

SYNOVIAL JOINT

Synovial Joint Joint in which two bones are separated by a space called a joint cavity Most are freely movable

SALIENT FEATURES Articular cartilage Capsule Synovial membrane Synovial cavity Synovial fluid Articular discs Ligaments Menisci Bursa Intra articular structures

hyaline cartilage covering the bone surfaces ARTICULAR CARTILAGE hyaline cartilage covering the bone surfaces

CAPSULE fibrous capsule lined by synovial membrane continuous with periosteum

SYNOVIAL MEMBRANE Synovial membrane attaches to the margins of the joint surfaces at the interface between cartilage and bone and encloses the articular cavity

SYNOVIAL CAVITY Joint cavity is synovial cavity Surrounded by synovial membrane

SYNOVIAL FLUID viscous slippery fluid rich in albumin & hyaluronic acid & similar to raw egg white

ARTICULAR DISC Circular rim of fibrous cartilage between articular surfaces of two bones

MENISCUS Meniscus is an incomplete rim of white fibrous cartilage between articular cartilages. Shock absorber Enhancement of congruence Protection of edges Weight distribution Facilitation of movement

BURSA Lubricating device consist of a closed fibrous sac. Present wherever tendon rub against bones,ligaments or other tendons

Tendon Sheaths and Bursae Tendon sheaths = cylinders of connective tissue lined with synovial membrane and wrapped around a tendon

INTRACAPSULAR STRUCTURE

TYPES OF SYNOVIAL JOINT Classified according to arrangement of articular surfaces and types of movement Plane joint Hinge Pivot Condyloid Ellipsoid Saddle Ball and socket

PLANE JOINT Opposed articular surfaces are flat, allowing bones to slide on one another Sternoclavicular and acromio clavicular joint

HINGE JOINT Resemble hinge on door Flexion and extension possible Elbow, knee and ankle joint

CONDYLOID JOINTS These are also known as bicondylar joints. There articular surfaces consist of two distinct condyles in which one is fitting into a concave surface of the other bone. These joints mainly permit the movement in plane around a transverse axis. Example of this type of joints is knee joint

PIVOT JOINTS Pivot joints are formed by a central bony pivot surrounded by an osteo-ligamentous ring. Movements are permitted in one plane around a vertical axis. Examples of this type are superior and inferior radioulnar joints and atlantoaxial joint

SADDLE JOINT Each articular surface is shaped like a saddle, concave in one direction and convex in the other Flexion, extension, abduction, adduction and rotation carpometacarpal joint at the base of the thumb

ELLIPSOID JOINTS Oval convex surface on one bone fits into a similarly shaped depression on the next radiocarpal joint of the wrist metacarpophalangeal joints at the bases of the fingers

BALL and SOCKET Socket deepened by acetabular labrum Blood supply to head of femur found in ligament of the head of the femur Joint capsule strengthened by ligaments

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