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because the skin layer is thicker in the vastus lateralis
The deltoid, vastus lateralis, and the gluteal muscles.
Deltoid, Vastus Lateralis, Gluteus Medius, Gluteus Maximus
The four main intramuscular injection muscles are the deltoid muscle, vastus lateralis muscle, ventrogluteal muscle, and dorsogluteal muscle. While the deltoid muscle site is the upper arm region, the vastus lateralis muscle site is on the thigh. The ventrogluteal muscle is the hip, and the dorsogluteal muscle is situated on the buttock area.
Vastus Lateralis, IM
Intramuscular (IM) injections are typically given in one of three muscles. These muscles are the vastus lateralis, or thigh muscle, the ventrogluteal, or hip muscle, and the deltoid, or upper arm muscle.
The vastus lateralis is one of the quadricep muscles. The quadriceps are comprised of the rectus femoris, vastus lateralis, vastus medialis and vastus intermedius. The vastus lateralis is in the anterior portion of the thigh and is lateral.
vastus lateralis muscle
All three muscles are easily accessible, can gradually absorb large quantities of drug, and are located at a safe distance from major nerves & arteries.
Vastus lateralis, vastus medialis, vastus intermedius,
Gluteus maximus- upper, outer quadrant of buttocks. Vastus lateralis- outer aspect of thigh. Deltoid- top of arm.
vastus lateralis, vastus medilis, vastus intermeduis