The subcutaneous tissue
is the layer of loose connective tissue
directly underlying the dermis
. It is mainly composed of adipose tissue
. Its thickness depends on the amount of fat present. Its physiological function includes insulation and storage of nutrients.
are given by injecting a fluid or a solid pellet into the subcutis. It is used to administer a variety of medical treatments. Subcutaneous injections of fluid are used to administer vaccines and medications. A pellet may be injected to deliver long-lasting doses of medication such as goserelin
. Subcutaneous injections provide slow and constant absorption and are one of the parenteral routes of administration.