Subcutaneous injections are administered in which tissue layer?

• A. Into a Vein
• B. Under the Skin
• C. Into a Muscle
• D. Into a Tendon

Answer: (B)

Subcutaneous injections are placed in the tissue layer just beneath the skin—the subcutaneous (hypodermis) layer, which is mainly fat and connective tissue. This position allows the medication to be absorbed slowly through the capillaries in that layer, which is why drugs like insulin or certain anticoagulants are given this way. It’s different from injecting into a vein (intravenous), which sends the drug directly into the bloodstream, or into a muscle (intramuscular), which results in faster absorption due to greater blood flow. Injecting into a tendon isn’t a standard or safe route. So the tissue layer targeted by subcutaneous injections is the layer under the skin.