1.
Injection site: Anterolateral thigh
Muscle: Vastus lateralis
Origin: Intertrochanteric line and gluteal tuberosity
Insertion: Tibial tuberosity (via patellar ligament) and Patella
Action: Extends the leg
How to locate: Divide the thighs into three categories. That being the greater trochanter being in the upper anatomical landmarks and patella being on the lower anatomical landmarks. The middle part is where you’ll be able to locate the Vastus lateralis.
2.
Injection site: Deltoid
Origin: Acromial extremity of clavicle, acromion of scapula, spine of scapula
Insertion: Deltoid tuberosity of humerus
Action: Abduct arm at shoulder joint, flex and medially rotate arm at shoulder joint, extend and laterally rotate arm at shoulder joint
How to locate: The injection site is in the middle of the muscle, about 2.5 to 5cm below acromion process. It is three finger widths below the middle of the muscle.