Which of the following is a common intramuscular injection site?

The deltoid muscle, located in the upper arm, is a commonly used site for intramuscular injections. This muscle is easily accessible and allows for the administration of medications with a sufficient volume, typically up to 1-2 mL. Additionally, the deltoid has a relatively good blood supply, which can aid in the absorption of the medication.

Other sites like the infraorbital region, which is located near the face, are less suitable for intramuscular injections and are typically used for dental or local anesthetic purposes. The brachial area, while it involves a muscle, is primarily associated with the brachioradialis muscle and is not a standard site for injections. The sural region, located in the calf, is also not a typical injection site due to the risk of hitting nerves and blood vessels.

Using the deltoid as a site for intramuscular injections is supported by its anatomical features, making it the preferred choice in both clinical and emergency settings.