1)
Site of injection: In the anterolateral thigh
Muscle targeted in injection: Vastus lateralis muscle
- 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 area: Find the outer portion of the middle third of the thigh
2)
Site of injection: Upper shoulder
Muscle targeted in injection: 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 area: Acromion process using your fingers to form a triangle
Reference:
Tortora, G. J., & Derrickson, B. (2017). Principles of anatomy and physiology (15th ed.). Wiley.