What does the term 'subcutaneous' refer to?

The term 'subcutaneous' specifically refers to the layer of tissue that lies beneath the skin. It is derived from Latin where 'sub' means 'under' and 'cutis' means 'skin'. This layer contains fat and connective tissue, providing insulation and cushioning for the body. It plays a crucial role in storing energy as fat, and also serves as a passage for blood vessels and nerves between the skin and the underlying muscles. Understanding this terminology is important in medical contexts, particularly when discussing injections, surgeries, or conditions affecting the skin and underlying tissues.