Human Anatomy - Lab 7

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  1. Deep muscles of the posterior thorax
    erector spinae
  2. Erector spinae
    Action: prime mover of back extension

    Antagonist: rectus abdominus
  3. Superficial muscles of the posterior thorax

    levator scapulae

  4. Trapezius
    Origin: occipital bone, spines of C7 and all T vertebrae

    Insertion: spine and acromion of scapula

    Action: extends head
  5. Levator scapulae
    Origin: transverse processes of C1 - C4

    Insertion: medial border of the scapula, superior to the spine

    Action: elevates and adducts scapula
  6. Rhomboids
    Action: retracts and rotates scapula
  7. Deep muscles of the thorax which assist in breathing
    external intercostals

    internal intercostals

  8. External intercostals
    Action: raises ribs for INSPIRATION (inhale)

    Antagonist: internal intercostals

    Synergist: pectoralis minor, diaphragm, scalenes, sternocleidomastoid
  9. Internal intercostals
    Action: depresses ribs for EXPIRATION (exhale)

    Antagonist: , external intercostals, pectoralis minor, diaphragm, scalenes, sternocleidomastoid
  10. Diaphragm
    Origin: xyphoid process, cartilages of lowest ribs, lumbar vertebrae

    Insertion: central tendon

    Action: prime muscle of inspiration

    Antagonist: internal intercostals

    Synergists: pectoralis minor, external intercostals, scalenes, sternocleidomastoid
  11. Superficial muscles of the anterior thorax
    pectoralis minor

    serratus anterior
  12. Pectoralis minor
    Origin: ribs 3, 4, 5

    Insertion: coracoid process of scapula

    Action: draws scapula anteriorly and inferiorly

    Synergist: external intercostals, diaphragm, scalenes, sternocleidomastoid
  13. Serratus anterior
    Action: protracts and rotates scapula

    Antagonist: rhomboids, trapezius
  14. Muscles of the abdomen
    rectus abdominis

    external oblique

    internal oblique

    transverse abdominis
  15. Rectus abdominis
    Origin: pubic crest and pubic syphysis

    Insertion: ribs 5-7 and xiphoid process

    Action: flexes trunk

    Antagonist: erector spinae

    Synergists: ilipsoas
  16. External oblique
    Action: flexion and rotation of trunk

    Synergist: rectus abdominis, internal oblique, transverse abdominis
  17. Internal oblique
    Action: flexes, rotates trunk

    Synergists: rectus abdominis, external oblique, transverse abdominis
  18. Transverse abdominis
    Action: compresses abdominal wall

    Synergists: rectus abdominis, external oblique, internal oblique
Card Set
Human Anatomy - Lab 7
Muscles of the Thorax, Abdomen, Shoulder & Upper Appendage
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