Superficial Deep Layer

• Splenius capitus
  • Bony Attachments:
    • 1. Lower Ligamentum nuchae and SP C7-T3
    • 2. Lateral superior nuchal line
  • Innervation: Lower cervical spinal nerves
  • Arterial Supply: Dorsal branch of Post. intercostal a.
  • Action: Extension of head
• Splenius cervicus
  • Bony Attachments:
    • 1. SP T3-T6
    • 2. Post. Tubercles of TP C1-C3
  • Innervation: Lower cervical and upper thoracic spinal nerves
  • Arterial Supply: Dorsal branch of Post. intercostal a.
  • Action: Rotates the spine ipsilaterally