Types of Joints Lecture
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Questions and Answers

What are the two main categories of joints?

  • Planar and condyloid
  • Synarthrosis and diarthrosis (correct)
  • Hinge and ball and socket
  • Biaxial and triaxial
  • What type of joint is characterized by a spool-like surface?

    Hinge joint

    Diarthrosis joints are synovial joints.

    True

    Which joint type allows movements in all three planes?

    <p>Ball and socket joint</p> Signup and view all the answers

    What is the fluid that lubricates synovial joints?

    <p>Synovial fluid</p> Signup and view all the answers

    A ______ joint allows only rotations.

    <p>pivot</p> Signup and view all the answers

    What is a characteristic feature of a saddle joint?

    <p>Convex surface in one plane and concave surface in the perpendicular plane</p> Signup and view all the answers

    What type of joints permit movements such as flexion and extension but not axial rotation?

    <p>Condyloid joints</p> Signup and view all the answers

    Study Notes

    Types of Joints

    • Joints connect two or more bones and are classified into two main categories: synarthrosis and diarthrosis.
    • Synarthrosis: Non-synovial joints lacking a joint cavity.
    • Diarthrosis: Synovial joints containing a joint cavity; examples include hip, knee, shoulder, and elbow joints.

    Characteristics of Diarthrosis Joints

    • Joint cavity enclosed by a fibrous elastic capsule.
    • Hyaline cartilage covers the bone surfaces within the joint.
    • Synovial fluid coats joint surfaces, facilitating movement.
    • Synovial membrane lines the inner capsule surface.
    • Joint capsule has two layers: outer fibrous membrane and inner synovial membrane.
    • Synovial fluid is compositionally similar to blood plasma but has lower protein content and higher hyaluronan concentration.

    Classification of Synovial Joints

    • Simple/Uniaxial Joints: Single pair of articular surfaces (one convex, one concave); examples include hinge and trochoid joints.
    • Compound/Biaxial Joints: Single joint capsule with multiple articulating surfaces; includes condyloid and saddle joints.
    • Complex/Multiaxial Joints: Incorporate inter-articular structures like menisci or discs; includes plain and ball-and-socket joints.

    Types of Synovial Joints

    • Ball and Socket Joints (Spheroid): Allows motion in all three planes; examples are the femur at the hip and the humerus at the shoulder.
    • Hinge Joints (Ginglymoid): Characterized by a spool-like surface fitting into a concave surface; example is the elbow joint.
    • Saddle Joints (Sellar): Have both convex and concave surfaces; an example is the carpometacarpal joint of the thumb.
    • Ellipsoid Joints: Similar to ball and socket joints but allow limited movement; an example is the wrist joint (radiocarpal articulation).
    • Pivot Joints (Trochoid): Allow rotational movement around a ring; an example is the humeral radial joint at the elbow.
    • Planar Joints (Gliding): Feature flat surfaces that slide over one another without axial motion; examples include some metatarsal and carpal joints.
    • Condyloid Joints: Characterized by an oval articular surface permitting flexion, extension, adduction, and circumduction, but not axial rotation; can be bicondylar if it has two surfaces.

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    1.7 Types of Joints PDF

    Description

    This quiz covers the classification of joints in the human body, focusing on synarthrosis and diarthrosis. Learn about the differences between non-synovial and synovial joints, as well as examples of various joint types such as the hip, knee, shoulder, and elbow joints. Test your knowledge on this important aspect of human anatomy.

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