Scalenus anterior

• I (insertions):

  • 1st rib

  A) scalenus anterior

  
• A (actions):

  • Bilateral action: neck flexion
  • Unilateral action: ipsilateral lateral flexion and contralateral rotation

  A) scalenus anterior

  
• O (origin):

  • Transverse processes of cervical spine

  A) scalenus anterior

  
• R (direction):

  • Downwards and laterally

  A) scalenus anterior

  
• A (actions):

  • All 3 assist with respiration

  A) scalenus anterior

  
• NS (nerve supply):

  • Ventral rami cervical spine (C3 - C8)

  A) scalenus anterior