1. Vaccine for the baby
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Site of injection: for babies and infants, the site of injection will be Vastus lateralis located in the anterolateral part of the thigh
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Targeted muscle in the injection: Vastus lateralis muscle
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Origin: Greater trochanter and linea aspera of femur.
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Insertion: Patella via quadriceps tendon and then tibial tuberosity via patellar ligament
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Action: As part of the quadriceps, it extends leg at knee joint
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How to locate this area: The child/ baby may be positioned by laying down or by being held by a parent. After exposing the child’s leg, palpate the muscle below the greater trochanter and above the lateral femoral condyle (knee joint). Imagine dividing the thigh region vertically into three equal parts. Finally, Give the injection in the area in the middle region, in the outer anterolateral aspect, lateral to the midpoint of the thigh.
2. Vaccine for the grandfather
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Site of injection: The vaccine will be given intramuscularly in the thickest area in Deltoid muscle - above the level of the armpit and approximately 2–3 fingerbreadths (~2") below the acromion process ( the muscle is located in the upper arm near the shoulder region)
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Targeted muscle in the injection: Deltoid muscle
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Origin: Acromial extremity of clavicle (anterior fibers), acromion of scapula (lateral fibers), and spine of scapula (posterior fibers)
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Insertion: Deltoid tuberosity of humerus.
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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
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How to locate this area: The patient should be first sitting comfortably with their arm exposed from the shoulder to the top of the elbow. Then, palpate the acromion, outer edge of the scapula, and trace an imaginary inverted triangle below the shoulder. The injection should be given 3-5cms below the acromion, in the middle of the triangle.
References:
Clinical guidelines (Nursing) : Intramuscular injections. (n.d.). The Royal Children’s Hospital Melbourne. https://www.rch.org.au/rchcpg/hospital_clinical_guideline_index/Intramuscular_Injections/#
Leonard, J. (2023, June 14). How to give an intramuscular injection. Medical News Today. https://www.medicalnewstoday.com/articles/323115
Tortora, G. & Derrickson, B. (2017). Chapter 11: The Muscular System. Principles of Anatomy and Physiology (15th ed.). Wiley.
https://www.immunize.org/catg.d/p2020a.pdf