Subcutaneous tissue is tissue that is under the skin layer, but is not muscle tissue. The most common type of tissue under the skin is fat, called subcutaneous fat, but there are various other different types of cells that are present in the subcutaneous tissue. Cells making up the subcutaneous tissue include fat cells (subcutaneous fat), fibrous tissue, adipose tissue, hair follicles, and various other types.
Drug delivery by injection often requires subcutaneous infection. For example, insulin injection in diabetics occurs into the subcutaneous tissue, usually into the subcutaneous fat layer. Alternatives to subcutaneous injection include intramuscular injection (directly into muscle tissue) and intravenous injection (directly into a vein).
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