Human Anatomy & Physiology FIFTH EDITION Elaine N. Marieb PowerPoint ® Lecture Slide Presentation by Vince Austin Copyright © 2003 Pearson Education, Inc.

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Human Anatomy & Physiology FIFTH EDITION Elaine N. Marieb PowerPoint ® Lecture Slide Presentation by Vince Austin Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Chapter 8 Joints Part D

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Types of Synovial Joints Plane joints Articular surfaces are essentially flat Allow only slipping or gliding movements Only examples of nonaxial joints Figure 8.7a

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Types of Synovial Joints Hinge joints Cylindrical projections of one bone fits into a trough-shaped surface on another Motion is along a single plane Uniaxial joints permit flexion and extension only Examples: elbow and interphalangeal joints Figure 8.7b

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Pivot Joints Rounded end of one bone protrudes into a “sleeve,” or ring, composed of bone (and possibly ligaments) of another Only uniaxial movement allowed Examples: joint between the axis and the dens, and the proximal radioulnar joint Figure 8.7c

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Condyloid, or Ellipsoidal, Joints Oval articular surface of one bone fits into a complementary depression in another Both articular surfaces are oval Biaxial joints permit all angular motions Examples: radiocarpal (wrist) joints, and metacarpophalangeal (knuckle) joints Figure 8.7d

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Saddle Joints Similar to condyloid joints but with greater movement Each articular surface has both a concave and a convex surface Example: carpometacarpal joint of the thumb Figure 8.7e

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Ball-and-Socket Joints A spherical or hemispherical head of one bone articulates with a cuplike socket of another Multiaxial joints permit the most freely moving synovial joints Examples: shoulder and hip joints Figure 8.7f

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Synovial Joints: Shoulder (Glenohumeral) Ball-and-socket joint in which stability is sacrificed to obtain greater freedom of movement Head of humerus articulates with the glenoid fossa of the scapula

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Synovial Joints: Shoulder Stability Weak stability is maintained by: Thin, loose joint capsule Four ligaments – coracohumeral, and three glenohumeral Tendon of the long head of biceps, which travels through the intertubercular groove and secures the humerus to the glenoid cavity Rotator cuff (four tendons) encircles the shoulder joint and blends with the articular capsule

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Synovial Joints: Shoulder Stability Figure 8.8a

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Synovial Joints: Shoulder Stability Figure 8.8b

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