A&P

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Author:
MamaRica
ID:
37977
Filename:
A&P
Updated:
2010-09-28 11:04:15
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Muscle Exam Big twenty something
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Description:
Actions of the big twenty something
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  1. Sternocleidomastoid
    ACTION

    Bilateral: Flexion of neck, extension of head.

    Unilateral: Lateral flexion of neck and head to same side. Rotation of neck and head to opposite side.
  2. Trapezius
    ACTION

    Entire muscle: Retracts and upwardly rotates scapula.

    Upper trap: elevates scapula, extends head.

    Lower trap: depresses scapula.
  3. Rhomboideus Major
    ACTION
    Retracts and downwardly rotates scapula.
  4. Levator Scapulae
    ACTION
    Elevates, retracts and downwardly rotates scapula.
  5. Latissimus Dorsi
    ACTION
    Extends, adducts and medially rotates humerus.

    Known as the "hand cuff muscle"
  6. Pectoralis Major
    ACTION
    • Entire muscle adducts and medially rotates humerus.
    • Clavicular head: flexes humerus.
    • Sternal head: extends humerus.

    "Forehand muscle in tennis"
  7. Deltoid
    ACTION
    • Entire muscle: abducts humerus.
    • Anterior deltoid: flexes and medially rotates humerus.
    • Posterior deltoid: extends and laterally rotates humerus.
  8. Triceps Brachii
    ACTION
    Extends arm and forearm
  9. Biceps Brachii
    ACTION
    • Flexes arm.
    • Flexes and supinates forearm
  10. Brachioradialis
    ACTION
    Flexes forearm
  11. Rectus Abdominis
    ACTION
    Flexes trunk
  12. External Oblique
    ACTION
    Flexes, laterally flexes and rotates trunk. Compresses abdomen.
  13. Quadratus Lumborum
    ACTION
    Lateral flexion of lumbar spine

    "Hip Hiker"
  14. Psoas Major
    ACTION
    • Flexion and lateral rotation of thigh.
    • Lateral flexion of lumbar spine
    • Adducts thigh
  15. Gluteus Maximus
    ACTION
    • Extension of thigh.
    • Assists in lateral rotation and abduction of thigh
  16. Tensor Fascia Latae
    ACTION
    • Assists in abduction flexion and medial rotation of thigh.
    • Stabilizes hip and knee joints.
    • Just an assister - REAL job is to stabilize hip and knee via IT band
  17. Biceps femoris
    ACTION
    • Extension of hip.
    • Flexion of knee.
  18. Semitendinosus
    Semimembranosus
    ACTION
    • Extension of hip
    • Flexion of knee
    • "Mule kick"
  19. Rectus Femoris
    ACTION
    • Flexion of hip
    • Extension of knee
    • "Kicking a ball"
  20. Sartorius
    ACTION
    • Assists in flexion of knee
    • Assists in flexion, abduction of lateral rotation of hip
  21. Gracilis
    ACTION
    Adduction of hip
  22. Tibialis Anterior
    ACTION
    Dorsiflexion and inversion of foot
  23. Peroneus Longus
    ACTION
    Plantar flexion and eversion of foot
  24. Gactrocnemius
    ACTION
    • Plantar flexion of foot
    • Assists in flexion of knee
  25. Soleus
    ACTION
    Plantar flexion of foot

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