. Text-book of anatomy and physiology for nurses. y from the glenoid fossa by its own weight if thesurrounding muscles be removed; it contains a synovial membranewhich covers the glenoid margin and folds like a sheath aroundthe long tendon of the biceps muscle (Fig. 54). Motions.—In every possible direction, as flexion, exiensioUyabduction, adduction, rotation, and circumduction, with greaterfreedom than any other joint of the body,because the socket is so shallow and thecapsule is so loose. Elbow-joint.—A hinge-joint {gingly-mus) (Fig. 55). Articular surfaces: the trochlea of thehumerus in th
. Text-book of anatomy and physiology for nurses. y from the glenoid fossa by its own weight if thesurrounding muscles be removed; it contains a synovial membranewhich covers the glenoid margin and folds like a sheath aroundthe long tendon of the biceps muscle (Fig. 54). Motions.—In every possible direction, as flexion, exiensioUyabduction, adduction, rotation, and circumduction, with greaterfreedom than any other joint of the body,because the socket is so shallow and thecapsule is so loose. Elbow-joint.—A hinge-joint {gingly-mus) (Fig. 55). Articular surfaces: the trochlea of thehumerus in the semilunar notch of theidna,and the capitidum of the humerus in thedepressed head of the radius. The ligaments—anterior, posterior, me-dial, and lateral—together compose alarge capsule. (They are attached to thehumerus above the olecranon fossa at theback, and above the coronoid and radialfossae in front.) The synovial membraneis extensive. Motions.—The elbow-joint proper iscapable of flexiofi and extension only, likeall -Left Acromio CLAVICULAR AND ShOULDER-JOINTS. I, Acromio-clavicular joint;2,3, conoid and trapezoid liga-ments; 4, transverse ligament,across suprascapular notch; 5,6, capsule; 7, groove for bicepstendon.—(Potters Anatomy.) The radius and ulna are connected together at their extremities, makingroiling joints (see p. 15); their shafts give attachment to an interosseousmembrane of white fibrous tissue which almost fills the space between the bones. Wrist-joint.—Between the forearm and the carpus, having avariety of gliding motions, but used principally as a surfaces: Above—the lower end of the radius and the tri-angular cartilage (or articular disc); below—the first row of carpalbones (not including the pisiform). The ligaments—anterior,posterior, medial, and lateral—enclose the joint like a capsule. Motions.—Flexion, extension, and slight lateral bending (orfrom side to side) making abduction and addu
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