Trunk Musculature

  1. Hypaxial muscles
    Located anterior to the spinal cord. Three groups include prevertebral, ventral, lateral muscle groups
  2. Epaxial muscles
    Muscle located posterior to spinal cord
  3. Neck, thorax, abdominal muscles groups
    Prevertebral, ventral, and lateral muscles
  4. Neck prevertabral muscles
    Longus coli and longus capitis muscle flex the cervical vertebrae and head
  5. Neck ventral muscles
    Strap muscles/infrahyoid move the hyod and larynx during swallowing
  6. Neck lateral muscles
    Scalene muscle extend the first two ribs and stabilize the thoracic cage during forced breathing and also laterally flex the neck
  7. Thorax prevertabral muscles
    Longus coli
  8. Thorax ventral muscles
  9. Thorax Lateral muscles
    • Intercostal muscles (transversus, internal, external)
    • Serratus posterior assist in ventilating the lungs
  10. Abdominal Prevertebral muscles
    Psoas major moves the hip joint
  11. Abdominal ventral muscles
    Rectus abdominis flexes the vertebral column
  12. Abdominal lateral muscles
    Transversus abdominis, internal oblique, external oblique. These help twist your lower trunk and compress its contents to build intra-abdominal pressure
  13. Epaxial muscles
    • Back muscles that extend from sacrum to head
    • Transversospinalis group rotate the spine and maintain posture
    • Erector spinae group are major extensors of the spinal column
  14. IT tract
    Tough region of deep fascia surrounding the leg
  15. Flexors or Extensors of the femur
    Gluteus maximus, ilipsoas, tensor fascia lata
  16. Rotation of femur
    Deep hip rotator
  17. Abduction or Adduction of femur
    • Gluteus medius: stabilizes hip when weight of body is on one leg
    • Adductor muscles: gracilis, pectineus, adductor (maagnus, longus, brevis)
  18. Flexors and extensors of tibia
    • Quadriceps are anterior compartment and are the extensors
    • Hamstring are flexor anterior compartment
  19. Posterior compartment of thigh
    • Hamstring originate at ischial tuberosity
    • Semimembranosus and semitendinosus, biceps femoris
    • Popliteus unlocks the knee
  20. Anterior compartment of thigh
    • Quadriceps are responsible for extension of the knee
    • Vastus lateralis, vastus medialis, rectos femoris, and sartiorius
  21. Lower leg muscle compartment
    • Anterior compartment: dorsiflexors and extensors of toes
    • Posterior compartment: plantarflexors and flexors of toes
    • Lateral compartment: evert foot
  22. Posterior muscles
    • Flexor digitorum longus, tibialis posterior, and flexor halluces longus arise from the interosseous membrane and adjacent bones. These flex the toes and hallux
    • Soleus suited for endurance activity
    • plantaris
    • Gastrocnemius has distal tendon called calcaneal (Achilles tendon)
  23. Anterior Compartment
    • Originate from the anterior surface of interosseous membrane and adjacent bones
    • Extensor digitorum longus, extensor halluces longus, and tibialis anterior
  24. Lateral Compartment
    Fibularis longus and brevis
Card Set
Trunk Musculature