Scapulothoracic Joint Movement
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Questions and Answers

Which muscle is responsible for upward rotation of the scapula?

  • Latissimus dorsi
  • Pectoralis Minor
  • Serratus Major (correct)
  • Upper trapezius

    • Which of the following muscles is NOT a scapulothoracic joint elevator?

  • Pectoralis Minor
  • Levator scapulae
  • Lower trapezius (correct)
  • Rhomboids

    • What is the primary function of the Rotator Cuff muscles?

  • To generate power for the shoulder
  • To control arthrokinematics
  • To stabilize the shoulder joint (correct)
  • To move the arm in the sagittal plane

    • Which muscle is responsible for internal rotation of the shoulder?

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

    Which muscle is a synergist during shoulder flexion?

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

    Which of the following muscles is responsible for scapular retraction and downward rotation?

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

    Which muscle is responsible for external rotation of the shoulder?

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

    Which muscle is responsible for shoulder extension?

    <p>Latissimus dorsi</p> Signup and view all the answers

    What type of joint is the scapulothoracic joint?

    <p>Anatomical false joint</p> Signup and view all the answers

    During shoulder elevation, which movement occurs at the glenohumeral joint?

    <p>Anterior translation</p> Signup and view all the answers

    What is the role of the rotator cuff in shoulder movement?

    <p>Secondary stabilizer</p> Signup and view all the answers

    Which joint is responsible for upward and downward rotation of the shoulder?

    <p>Scapulothoracic joint</p> Signup and view all the answers

    What is the function of the subacromial bursa in the shoulder joint?

    <p>Avoiding friction</p> Signup and view all the answers

    Which of the following is NOT a movement possible at the scapulothoracic joint?

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

    What is the type of movement occurring at the glenohumeral joint during flexion?

    <p>Fixed point, no rolling or sliding</p> Signup and view all the answers

    Which ligaments limit the movement at the acromioclavicular joint?

    <p>Conoid and trapezoid ligaments</p> Signup and view all the answers

    What is the primary function of the subclavius muscle in the Scapulothoracic Joint?

    <p>To stabilize the clavicle</p> Signup and view all the answers

    During shoulder elevation, which of the following movements occurs in the Scapulothoracic Joint?

    <p>Upward rotation of the scapula</p> Signup and view all the answers

    In the first stage of shoulder flexion (0-30/60°), which of the following muscles are primarily involved?

    <p>Anterior deltoids, coracobrachialis, and clavicular pectoralis major</p> Signup and view all the answers

    What is the primary role of the rotator cuff muscles in shoulder flexion?

    <p>To stabilize the glenohumeral joint</p> Signup and view all the answers

    During shoulder rotation, which of the following planes of motion is involved?

    <p>Horizontal plane</p> Signup and view all the answers

    What is the significance of the scapula following the path of the clavicle during shoulder movements?

    <p>It allows for smooth and coordinated movement of the shoulder complex</p> Signup and view all the answers

    What is the name of the joint that is involved in the third stage of shoulder flexion (120-180°)?

    <p>Glenohumeral joint</p> Signup and view all the answers

    During bilateral flexion of the shoulder, what is the resulting action on the spine?

    <p>It produces lumbar lordosis</p> Signup and view all the answers

    What happens when there is no ABD slide?

    <p>The humerus is compressed against the coracoacromial arch</p> Signup and view all the answers

    What is the main difference between ABD in the frontal plane and scapular plane?

    <p>One has structural compression and the other does not</p> Signup and view all the answers

    What is the result of simultaneous glide and roll of the head of the humerus?

    <p>The head rolls over a smaller surface</p> Signup and view all the answers

    What is the total range of motion for shoulder abduction?

    <p>180 degrees</p> Signup and view all the answers

    What is the function of the Conoid and Trapezoid ligaments?

    <p>To stabilize the AC joint statically</p> Signup and view all the answers

    What are the two types of stabilizers of the AC joint?

    <p>Static and dynamic</p> Signup and view all the answers

    What is the function of the Supraspinatus action?

    <p>To glide and roll the head of the humerus</p> Signup and view all the answers

    What does the scapula do to contribute to the total range of motion of shoulder abduction?

    <p>It upwardly rotates 60 degrees</p> Signup and view all the answers

    What is the primary action of the rhomboids during scapular movement?

    <p>Scapular adduction</p> Signup and view all the answers

    Which muscle group is responsible for the first stage of global abduction, from 0-90 degrees?

    <p>Deltoids and supraspinatus</p> Signup and view all the answers

    What is the primary function of the serratus anterior muscle during shoulder movement?

    <p>Upward rotation of the scapula</p> Signup and view all the answers

    Which muscle is responsible for external rotation of the shoulder, from 60-70 degrees?

    <p>Infraspinatus and teres minor</p> Signup and view all the answers

    What is the primary action of the subscapularis muscle during shoulder movement?

    <p>Internal rotation of the shoulder</p> Signup and view all the answers

    Which muscle group is responsible for the second stage of global abduction, from 90-150 degrees?

    <p>Serratus anterior and upper trapezius</p> Signup and view all the answers

    What is the primary action of the teres major muscle during shoulder movement?

    <p>Internal rotation of the shoulder</p> Signup and view all the answers

    During global abduction, what is the primary action of the adductor muscles?

    <p>Eccentric contraction</p> Signup and view all the answers

    Study Notes

    Muscles of the Scapulothoracic Joint

    • Elevators: Upper trapezius, levator scapulae, rhomboids.
    • Depressors: Lower trapezius, latissimus dorsi, pectoralis minor, subclavius.
    • Protractors: Serratus anterior (Serratus major).
    • Rotators: Scapulothoracic joint rotation involves the SCC (sternoclavicular joint) movement.
    • Retractors: Middle trapezius, rhomboids, and lower trapezius.

    Muscle Actions in Arm Elevation

    • Abduction: Anterior and middle deltoids, supraspinatus.
    • Flexion: Anterior deltoids, coracobrachialis.
    • Upward Rotation of Scapula: Serratus anterior, upper trapezius.
    • Dynamic Joint Stability: Regulated by rotator cuff muscles.

    Glenohumeral (GH) Joint Overview

    • Type: Ball and socket joint, offering poor stability.
    • Stabilizers:
      • Static: Joint capsule, ligamentous complex, glenoid labrum.
      • Dynamic: Rotator cuff muscles.

    Subdeltoid Joint

    • Classification: Anatomical false joint, true physiological joint.
    • Function: Facilitates arm abduction, reduces friction through subacromial bursa.

    Scapulothoracic Joint Functions

    • Anatomy: Also an anatomical false joint.
    • Actions: Elevation, depression, protraction, retraction, upward and downward rotation.

    Acromioclavicular Joint

    • Type: Plane joint allowing limited sliding movements, supported by conoid and trapezoid ligaments.

    Sternoclavicular Joint

    • Type: Saddle joint, divided by an articular disc.
    • Function: Allows sliding and rolling movements.

    Glenohumeral Kinematics

    • Flexion: Glenoid twist with anterior translation; no rolling or sliding during fixed points.
    • Kinematic Dynamics: Active involvement of the subclavius muscle in stabilization.

    Scapulothoracic Joint Kinematics

    • Elevation/Depression: Scapula movements follow the clavicle's path (opposite during depression).
    • Protraction/Retraction: Similar horizontal plane mechanics as elevation and depression.
    • Upward/Downward Rotation: Linked to SCC movements during arm raises or retraction.

    Muscle Actions During Arm Movements

    • Global Flexion: Split into three stages, using anterior deltoids and coracobrachialis primarily for initial stages.
    • Global Abduction: Three stages with specific muscle participation, primarily deltoids and supraspinatus.

    Rotator Cuff Muscles

    • Role: Maintain dynamic stability during all shoulder movements.
    • Internal Rotators: Subscapularis, anterior deltoid, pectoralis major, latissimus dorsi, teres major.
    • External Rotators: Infraspinatus, teres minor, posterior deltoid.

    Kinematic Considerations

    • Total Shoulder Abduction: 180 degrees includes contributions from scapular motion.
    • AC Joint Stabilizers: Static reinforcement from joint capsule and ligaments, dynamic stabilization from deltoid and upper trapezius.

    Key Functional Aspects

    • Importance of Scapular Plane Abduction: Facilitates smoother motion versus frontal plane abduction, reducing structural compression during elevation.
    • Compensatory Mechanisms: Involved during adduction and extensional movements, emphasizing eccentric contractions of involved muscle groups.

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    Description

    Quiz about the movements of the scapulothoracic joint, including osteokinematics and arthrokinematics, and the roles of the subclavius muscle and articular disc. Learn about scapular elevation, depression, protraction, retraction, and upward rotation.

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