Common intramuscular injection sites on the human body include the deltoid muscle, the vastus lateralis muscle, the ventrogluteal muscle and the dorsogluteal muscle, according to About.com. Subcutaneous injection sites include the patient's upper arm and the top of the thighs, claims Johns Hopkins Arthritis Center.
The buttocks and the abdomen, save the waist and the navel, are also subcutaneous injection sites, says Johns Hopkins Arthritis Center.
The deltoid muscle is in the upper arm, according to About.com. The vastus lateralis is in the thigh. If dividing the thigh in three, this muscle is in the center. The ventrogluteal muscle is in the hip, and the dorsogluteal muscle is the large muscle in the buttock.