Educational video describing intramuscular injection of the vastus lateralis muscle. The vastus lateralis muscle is the largest part of the quadriceps femoris muscle group which also includes the rectus femoris, the vastus intermedius and the vastus medialis muscle. Quadriceps muscle includes four muscles: 1-Vastus lateralis 2-Vastus medialis 3-Vastus intermedius 4-Rectus femoris (superficial layer) Innervation: the vastus lateralis muscle is innervated by the femoral nerve. The vastus lateralis muscle is a common site for intramuscular injection. Injection technique •Locate the greater trochanter of the femur. •The top border of the vastus lateralis muscle can be found a hand width below the groin. The bottom border of the vastus laterlis muscle is found a hand above the knee.the side borders from the mid anterior thigh to the mid lateral thigh. •Squeezing the muscle before injection increases the thickness and depth of the muscle and avoids joint injuries. •Make sure you do not advance the needle deep to touch the bone. •Aspirate before you inject. Become a friend on facebook: http://www.facebook.com/drebraheim Follow me on twitter: https://twitter.com/#!/DrEbraheim_UTMC