Anterior Compartment

• Tibialis Anterior (most superficial)
  • Bony Attachments:
    • 1. Lateral condyle and superior half of lateral surface of tibia and interosseous membrane
    • 2. Medial cuneiform and base of 1st metatarsal
  • Innervation: Deep peroneal nerve (L4 & L5)
  • Arterial Supply: Anterior tibial artery
  • Action: Dorsiflexes ankle, inverts foot
• Extensor Hallucis Longus (beneath tibialis anterior and medial to extensor digitorum)
  • Bony Attachments:
    • 1. Middle part of anterior surface of fibula and interosseous membrane
    • 2. Dorsal aspect of base of distal phalanx of great toe by way of extensor sheath
  • Innervation: Deep peroneal nerve (L5 & S1)
  • Arterial Supply: Anterior tibial artery
  • Action: Extend great toe and dorsiflex foot
• Extensor Digitorum Longus (most lateral of the group)
  • Bony Attachments:
    • 1. Lateral condyle of tibia and superior three fourths of medial surface of the fibula and interosseous membrane
    • 2. Extensor expansion sheath of dorsal side of toes 2-5 (middle and distal phalanges)
  • Innervation: Deep peroneal nerve (L5 & S1)
  • Arterial Supply: Anterior tibial artery
  • Action: Extends lateral 4 toes and dorsiflexes foot
• Peroneus Tertius (muscle belly most inferior of anterior compartment group)
  • Bony Attachments:
    • 1. Inferior fibula and interosseous membrane
    • 2. Dorsum of the base of the 5th metatarsal
  • Innervation: Deep peroneal nerve (L5 & S1)
  • Arterial Supply: Anterior tibial artery
  • Action: Dorsiflexes the foot and assists in eversion of the foot