Which muscle group is commonly used for intramuscular injections?

The deltoid muscle is commonly used for intramuscular injections due to its accessibility and size. Located in the upper arm, the deltoid is a thick, rounded muscle that offers a suitable site for administering medications. This area has a good blood supply, allowing for rapid absorption of the injected substance, and it is less likely to cause injury to major nerves or blood vessels compared to other muscle groups.

In addition, the deltoid muscle can accommodate small to moderate volumes of medication, making it an ideal choice for vaccines and certain medications. The administration technique involves locating the muscle's bulk, typically in the lateral aspect of the upper arm, which is central to safe and effective injections.

Other muscle groups, while capable of being used for intramuscular injections, may present more challenges or risks. For example, the rectus abdominis is not typically chosen because it is not as large or robust as the deltoid, and the abdomen is generally avoided for injections due to the presence of underlying organs. The trapezius muscle, located in the upper back and neck region, might pose risks for nerve injury and doesn't have the same suitability for injections. The quadriceps muscle is often used for larger volumes but is less preferred for