1.
Site of injection: anterolateral thigh
targeted muscle: vastus lateralis
- origin: greater trochanter and linea aspera of femur
- insertion: patella via quadriceps tendon and then tibial tuberosity via patellar ligament
- action: extend leg at knee joint; rectus femoris muscle acting alone also flexes thigh at hip joint
- how to locate: The injection site could be located by palpating the patient’s thigh at the anterior lateral aspect. Vastus lateralis is the muscle inferior to the greater trochanter and superior to the lateral femoral condyle.
2.
muscle: deltoid
origin: acromial extremity of clavicle (anterior fibers), acromion of scapula (lateral fibers), and spine of scapula (posterior fibers)
insertion: deltoid tuberosity of humerus
action: lateral fibers abduct arm at shoulder joint; anterior fibers flex and medially rotate arm at shoulder joint; posterior fibers extend and laterally rotate arm at shoulder joint.
how to locate: the injection site is about 2-3 finger breadths inferior from the acromion process. The site is in the thickest and central portion of the arm.