Item 1
Where are the sites of injection? Anterolateral thigh
What muscle is targeted in the injection? Vastus Lateralis
Origin: Greater trochanter and linea aspera of femur
Insertion: Patella via quadriceps tendon and then tibial tuberosity via patellar ligament
Action: All four heads extend leg at knee joint; rectus femoris muscle acting alone also flexes thigh at hip joint
How do you locate this area? Dividing the upper thigh into three parts would be the first step in locating this area. After the division, for injection, use the middle third on the outside or middle of the muscle
Item 2
Where are the sites of injection? Deltoid Muscle
What muscle is targeted in the injection? Deltoid
Origin: Clavicle (clavicular head), sternum, and costal cartilages of ribs 2–6 and sometimes ribs 1–7 (sternocostal head
Insertion: Greater tubercle and lateral lip of intertubercular sulcus of humerus
Action: As a whole, adducts and medially rotates arm at shoulder joint; clavicular head flexes arm, and sternocostal head extends flexed arm to side of trunk
How do you locate this area? Place the patient in a comfortable sitting position. Since the deltoid muscle has forms of a rounded triangle, have their arm visible from shoulder to the top of the elbow in and trace a hypothetical inverted triangle below the shoulder by palpitating the outside border of the scapula to locate this area.
References:
Clinical guidelines (Nursing) : Intramuscular injections. (n.d.). https://www.rch.org.au/rchcpg/hospital_clinical_guideline_index/Intramuscular_Injections/#:~:text=The%20deltoid%20muscle%20is%20a,inverted%20triangle%20below%20the%20shoulder.
Pietrangelo, A. (2018, February 9). Z-Track injections overview. Healthline. https://www.healthline.com/health/z-track-injection#why-they-are-used
Tortora, G. J., & Derrickson, B. (2017). Principles of anatomy and physiology (15th ed.). Wiley Custom Learning Solutions. https://handoutset.com/wp-content/uploads/2022/05/Principles-of-anatomy-and-physiology-Wiley-2017-Derrickson-Bryan-H._-Tortora-Gerard-J..pdf