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Muscle Origins, Insertions, and Actions in Scapular and Shoulder Movement

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이 집합의 용어 (36)

  • Origin of a muscle

    The fixed end of a muscle; usually the proximal attachment.

  • Insertion of a muscle

    The movable end of a muscle; usually the distal attachment.

  • Action of a muscle

    The motion a muscle creates when it contracts.

  • Agonist muscle

    The prime mover primarily responsible for a specific movement.

  • Antagonist muscle

    The muscle that opposes the action of another muscle.

  • Synergist muscle

    A muscle that helps an agonist work efficiently during movement.

  • Scapulothoracic movement

    Movement of the scapula relative to the thorax.

  • Glenohumeral movement

    Movement of the humerus relative to the glenoid cavity of the scapula.

  • Levator scapulae origin

    Transverse processes of C1-C4 vertebrae.

  • Levator scapulae insertion

    Vertebral border of scapula from superior angle to root of spine.

  • Levator scapulae actions

    Scapular elevation and medial (downward) rotation.

  • Pectoralis minor origin

    Anterior surfaces of ribs 3, 4, and 5.

  • Pectoralis minor insertion

    Coracoid process of scapula.

  • Pectoralis minor actions

    Scapular protraction, depression, medial rotation, anterior tilt; assists forced inhalation.

  • Rhomboid major origin

    Spinous processes of T2-T5 vertebrae.

  • Rhomboid major insertion

    Vertebral border of scapula from root of spine to inferior angle.

  • Rhomboid major actions

    Scapular adduction (retraction) and medial rotation.

  • Rhomboid minor origin

    Spinous processes of C7 and T1 vertebrae.

  • Rhomboid minor insertion

    Root of spine of scapula.

  • Rhomboid minor actions

    Scapular adduction (retraction) and medial rotation.

  • Serratus anterior origin

    Lateral surfaces of upper 8 ribs.

  • Serratus anterior insertion

    Anterior surface of vertebral border of scapula.

  • Serratus anterior actions

    Scapular protraction and lateral rotation; stabilizes scapula.

  • Strongest abductor of scapula

    Serratus anterior.

  • Subclavius origin

    First rib.

  • Subclavius insertion

    Inferior border of clavicle.

  • Subclavius actions

    Depresses clavicle and stabilizes sternoclavicular joint.

  • Trapezius upper origin

    External occipital protuberance and ligamentum nuchae.

  • Trapezius upper insertion

    Lateral third of clavicle and acromion of scapula.

  • Trapezius upper actions

    Scapular elevation and lateral (upward) rotation.

  • Trapezius middle origin

    Spinous processes of C7-T3 vertebrae.

  • Trapezius middle insertion

    Spine of scapula.

  • Trapezius middle action

    Scapular adduction (retraction).

  • Trapezius lower origin

    Spinous processes of T4-T12 vertebrae.

  • Trapezius lower insertion

    Root of spine of scapula.

  • Trapezius lower actions

    Scapular depression and lateral (upward) rotation.