Vastus Lateralis Muscle: This muscle is located in the thigh. Toproperly mark this muscle, divide the front of the thigh into thirdsfrom the top to the bottom of the thigh. The needle should go into themiddle third.
Dorsogluteal Muscle: This is the large muscle in the backside. Divideone buttock into quadrants, halfway down the middle and halfwayacross. You will always want to give the injection in the outer, upperquadrant, almost toward the hip
Deltoid Muscle: The deltoid muscle is located in the upper arm, justbelow the shoulder. To mark this site, place the palm of your hand onthe shoulder and spread your thumb from the other 4 fingers in anupside down V shape. Make sure that the middle of the arm is centeredin your V. You will want to give the injection into the middle of theV.
Ventrogluteal Muscle: This muscle is located in the hip. To mark thissite, have the person lie on their back. You should stand facing theirhips. Place the heel of your hand so that your wrist is lined up withthe thigh, the thumb is pointed toward the groin and the fingers arepointed toward the head. You should feel the border of a bony areaalong the ring finger and pinkie. Spread your pointer finger andmiddle finger into a V and give the injection between those fingers.