Knee Extension Anatomy Quiz

Knee Extension

• Primary Muscles (Quadriceps):

  • Rectus femoris
  • Vastus lateralis
  • Vastus intermedius
  • Vastus medialis

• Range of Motion:

  • Complete knee extension: 120-130 degrees of flexion to 0 degrees

• Factors Limiting Motion:

  • Tension of hamstring muscle

• Rectus Femoris Muscle Anatomy:

  • Origin: anterior inferior iliac spine
  • Reflected head: ilium above acetabulum

• Vastus lateralis Muscle Anatomy:

  • Origin: upper intertrochanteric line, base of greater trochanter, lateral linea aspera, lateral supracondylar ridge and lateral intermuscular septum
  • Insertion: lateral quadriceps tendon to patella

• Vastus Intermedius Muscle Anatomy:

  • Origin: anterior and lateral shaft of femur
  • Insertion: quadriceps tendon to patella, via ligamentum patellae into tubercle of tibia

• Vastus Medialis Muscle Anatomy:

  • Origin: lower intertrochanteric line, medial linea aspera, medial intermuscular septum
  • Insertion: medial quadriceps tendon to patella and directly into medial patella, via ligamentum patellae into tubercle of tibia

• Nerve Supply: Femoral nerve

• Insertion Points (Common to Quadriceps): quadriceps tendon to patella and via ligamentum patellae into tubercle of tibia

• Actions: Extend the knee,flex the hip

• Effects of Weakness:

  • Difficulty with activities like stair climbing and rising from a seated position
  • Potential for knee hyperextension

• Effects of Shortness/Contracture:

  • Restricted knee flexion and hip extension/flexion

Test your knowledge on the anatomy and function of the quadriceps muscles involved in knee extension. This quiz covers muscle origins, insertions, and key factors affecting range of motion. Perfect for students or enthusiasts in anatomy and physiology.