Trunk and shoulder Muscles

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Author:
misbah
ID:
223735
Filename:
Trunk and shoulder Muscles
Updated:
2013-06-13 11:41:08
Tags:
trunk shoulder
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oia
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  1. Trapezius
    o = occipital bone, ligament nuchae, spinous process of thoracic vertebra

    i = outer third of clavicle, scapular spine, acromion

    a = adducts, raises/rotates scapula, draws head backwards
  2. Rhomboideus major
    o = spinous process of thoracic vertebra

    i = vertebral border of scapula

    a = adducts and rotates scapula
  3. Deltoideus
    o = lateral third of clavicle, acromion process and spine of scapula

    i = deltoid tuberosity of humerus

    abducts arm
  4. pectoralis major
    o = medial half of clavicle, body of sternum, cartilages of ribs 2-6

    i = intertubercular groove of humerus

    flexes, adducts, medially rotates arm
  5. pectoralis minor
    o = ventral surface of ribs 3-5

    i = coracoid process of scapula

    draws scapula forward and down, with some rotation
  6. serratus anterior
    o = outer surface of ribs 1- 9

    i = ventral surface of scapula near vertebral border

    pulls scapula forward and toward chest wall. protracts shoulder
  7. latissumus dorsi
    o = ribs 8-12, spinous process of lower thoracic and lumbar vertebra

    i = intertubercular groove of humerus

    extends, adducts medially rotates arm
  8. supraspinatus
    o = supraspinous fossa of scapula

    i = greater tubercle of humerus

    abducts arm
  9. infrasspinatus
    o = infraspinous fossa of scapula

    i = greater tubercle of humerus

    a = lateral rotation and slight adduction of humerus

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