Which muscle group is NOT typically used for IM injections?

The soleus muscle is not typically used for intramuscular (IM) injections because it is primarily a muscle of the lower leg that plays a crucial role in standing and walking by assisting with plantar flexion at the ankle. IM injections are generally given in muscles that are larger, more developed, and located in areas where the risk of injury to nerves and blood vessels is minimized.

In contrast, the gluteus maximus, vastus lateralis, and deltoid are all suitable sites for IM injections because they are larger muscle groups that can safely accommodate the volume of medication being administered. The gluteus maximus is a major muscle of the buttocks, the vastus lateralis is one of the quadriceps muscles located on the outer thigh, and the deltoid is a prominent muscle in the upper arm. Each of these muscle groups provides a viable site for injections, ensuring effective absorption of medication into the bloodstream. The soleus, while important functionally, does not meet these criteria for IM injections, making it the correct choice for this question.