Dr. Ebraheim’s educational animated video describes intramuscular injection of the deltoid muscle - vaccine administration.

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Deltoid Injection for Vaccination
The deltoid intramuscular injection is a common procedure. One must be aware of the proper location for the injection and the proximity of the neurovascular structures present within the involved region. The size of the deltoid mass is small in relationship to other IM injection sites (this leaves a small margin for error at the deltoid site for injection). Deltoid injection is ideal for administering vaccinations. Accurate identification of the safe zone for injection is important. The correct location for the injection is in the middle part of the deltoid muscle from the side view. The acromion process is a great landmark to help in selecting the proper site for injection. Identify the acromion and go about 2.5cm to 5cm below the acromion (ideal site for injection), which is about 1-2 inches below the acromion. For deltoid intramuscular injection, you can use the square method or the triangle method. Both methods are about the same. If you superimpose both injection techniques, the ideal site for injection remains about the same. Some people may make a triangle with the fingers as shown here in order to have a proper location for the injection. You can see that the top finger is over the acromion process. Inferiorly, there is less of a safe zone due to the close proximity of the neurovascular bundle to the inferior part of the deltoid. Care must be given not to cause injury to the axillary nerve and the radial nerve during intramuscular injection of the deltoid muscle. The axillary nerve runs transversely from posterior to anterior about 7cm distal to the acromion. The injection site should not exceed 5cm distal to the acromion because this is the danger zone and the axillary nerve can be injured.

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