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A subcutaneous (S.C.) injection is administered under the skin. This method involves the insertion of a needle into the layer of fat and tissue just beneath the epidermis, allowing for the medication to be absorbed slowly into the bloodstream. Subcutaneous injections are commonly used for various purposes, such as administering insulin or vaccines, due to their ease of access and the relatively safe nature of the procedure.

In contrast, delivering medication into the spinal cord requires specialized techniques and is referred to as an intrathecal injection. An injection into the ear canal is typically related to local treatments for ear conditions and is not categorized as a subcutaneous injection. Finally, injecting into the stomach usually describes an intramuscular or intragastric route, which differs from subcutaneous administration. Each method is designed for specific medical needs and has different implications for drug absorption and efficacy.