1.
Injection Site: Anterolateral thigh
Target Muscles: Vastus lateralis
Origin: Greater trochanter and linea aspera of femur
Insertion: Patella via quadriceps tendon and then tibial tuberosity via patellar ligament
Action: Extends the knee joint
Locating the Vastus lateralis:
1. Position the baby at supine position
2. Locate the middle third of thigh between hip and knee
3. Injection should be given halfway between the hip and the knee (middle third of the muscle)
2.
Injection Site: Upper arm
Target Muscles: Deltoid
Origin: Lateral third of clavicle, acromion, and spine of scapula
Insertion: Deltoid tuberosity of humerus
Action: Flex, extend, rotate, and abduct the arm
Locating the Deltoid muscle:
1. Position the patient sitting or standing, have them relax their arm
2. Locate the acromion process (bony point on the shoulder)
3. Injection site is about 2-3 finger widths below the acromion process (thickest part of the muscle), middle of the muscle to avoid nerves and blood vessels