BIO 11 Lecture Notes - Lecture 9: Skeletal Muscle, Endomysium, Anatomical Terms Of Motion
Document Summary
Simplest & least mobile, where two flat surfaces of bone sit together. Intertarsal joints of the ankle and foot. Convex surface of a bone fits into concave depression of other bone. Rounded surface of one bone fits into groove on the surface of other. Stability enhanced by fibro-osseous ligament around rounded bone. Atlantoaxial joint (1st & 2nd cervical vertebrae), proximal radioulnar joint. Oval, convex surface of one bone fits into the shallow concave surface of the other bone. Allows both flexion and extension, abduction and adduction. Surface of each articulating bone has both convex and concave regions that complement one another. Allows greater motion than condyloid or hinge joints. The articulating surface of one bone is ball-shaped and fits into the socket of the other bone. Hip, shoulder joint (most freely movable (shallow glenoid cavity) but less stability, increased risk of injury. Protect and control body openings (eg. eyelids, mouth)
