Splenius capitis

• O (origin):

  • Spinous processes of T4 - C7
  • Lower half of ligamentum nuchae

  A) Splenius capitis

  
• R (direction):

  • Upwards

  A) Splenius capitis

  
• I (insertions):

  • Mastoid process
  • Lateral 1/3 superior nuchal line

  A) Splenius capitis

  
• A (actions):

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

  A) Splenius capitis

  
• NS (nerve supply):

  • Dorsal rami (C3 - C5)

  A) Splenius capitis