Quadriceps Femoris

• Rectus Femoris
  • Bony attachments:
    • 1. Anterior inferior iliac spine & ilium (superior to acetabulum)
    • 2. Base of patella and by the patellar ligament to tibial tuberosity
  • Innervation: Femoral nerve (L2, L3, & L4)
  • Arterial supply: Femoral artery
  • Action: Extends lower leg & flex thigh
• Vastus Lateralis
  • Bony attachments:
    • 1. Lateral lip of linea aspera and lateral gluteal tuberiosity
    • 2. Base of patella by the patellar ligament to tibial tuberosity
  • Innervation: Femoral nerve (L2, L3, & L4)
  • Arterial supply: Femoral artery
  • Action: Extends lower leg
• Vastus Intermedius
  • Bony attachments:
    • 1. Anterior shaft of femur
    • 2. Base of patella by the patellar ligament to tibial tuberosity
  • Innervation: Femoral nerve (L2, L3, & L4)
  • Arterial supply: Femoral artery
  • Action: Extends lower leg
• Vastus Medialis
  • Bony attachments:
    • 1. Linea aspera and intertrochanteric line
    • 2. Base of patella by the patellar ligament to tibial tuberosity
  • Innervation: Femoral nerve (L2, L3, &L4)
  • Arterial supply: Femoral artery
  • Action: Extends lower leg
• Articularis Genu
  • Bony attachments:
    • 1. Anterior inferior aspect of femur (deep to quadriceps)
    • 2. Anterior part of synovial capsule of the knee joint
  • Innervation: Femoral nerve (L2, L3, & L4)
  • Arterial supply: Femoral artery
  • Action: Tightens the anterior aspect of synovial capsule (prevents capsule from being pinched)