Lab 6 muscles:1 Head neck shoulder and trunk muscles and their actions

  1. frontal belly
    raises the eyebrows, wrinkles forehead
  2. orbicularis oculi
    closes eyes (blinking, squinting)
  3. orbicularis oris
    wraps around the lips, closes and purses them
  4. buccinator
    compresses cheek (whistling)
  5. corrugator supercilii
    wrinkles skin of forehead vertically
  6. zygomaticus
    raises corners of mouth for smiling
  7. platysma
    tenses skin of neck
  8. masseter
    elevates and protracts mandible
  9. temporalis
    elevates and retracts mandible
  10. sternocleidomastoid
    flexion of head when both sides are contracted, rotates head to opposite shoulder when only one side is contracted
  11. splenius capitis
    extends nd hyperextends head
  12. erector spinae
    extends vertebral column
  13. intercostals
    elevates rib cage during inspiration (inhalation)
  14. internal intercostals
    depresses rib cage during forced exhalation
  15. diaphragm
    prime mover of inspiration (inhalation), increases vertical dimensions of thorax
  16. external oblique
    compresses abdominal wall, trunk rotation and lateral flexion
  17. internal oblique
    compresses abdominal wall, trunk rotation and lateral flexion
  18. rectus abdominis
    flexes vertebral column (6pack)
  19. pectoralis minor
    draws scapula forward and downward
  20. serratus anterior
    draws scapula forward (protracts)
  21. trapezius
    elevates and retracts scapula
  22. major
    flexes, adducts, and medially rotates arm
  23. latissimus dorsi
    extends and adducts arm
  24. deltoid
    abducts, flexes and extends arm
  25. subscapularis
    rotates arm medially (at shoulder joint)
Author
tanyalequang
ID
317110
Card Set
Lab 6 muscles:1 Head neck shoulder and trunk muscles and their actions
Description
bio 250
Updated