Where are intramuscular injections typically administered?

Intramuscular injections are administered in specific muscle groups that provide a suitable site for drug absorption. The most common sites include the deltoid muscle of the upper arm, the gluteus muscle in the buttocks, and the quadriceps muscle in the thigh.

The deltoid muscle is favored for vaccinations due to its accessibility and relatively small volume capacity. The gluteus muscles, especially the gluteus maximus, are ideal for larger volumes of medication and are used extensively in clinical settings for various injections. The quadriceps, located in the anterior thigh, are another reliable site for intramuscular injections, particularly for children or when the other sites are not suitable.

These specific muscle groups provide larger blood vessels for drug absorption and reduce the risk of nerve injury or other complications that might occur in other areas of the body. The other answer options include sites that are not typically used for intramuscular injections, as they may involve smaller muscle masses or increased risk for injury.