The subcutis is the layer of tissue directly underlying the cutis. It is mainly composed of adipose tissue. Its physiological function includes insulation and storage of nutrients. Directly below the subcutis is usually a layer of muscle (covered in a fascia) or bone (covered in periosteum).
Subcutaneous (abbr: subq) injections are given by injecting a fluid into the subcutis. It is relatively painless and an effective way to administer particular types of medication. Certain depot injections, such as goserelin, are a solid or oil-based medication which is administered subcutaneously where it releases its agent slowly over a period of weeks.

iVillage: Birth Control Methods: Hormonal Implant - Fact sheet about long-term contraceptive methods (such as Implanon or Jadelle) involving the insertion of thin flexible tubes that release progestin.
Meta Description: [ A hormonal implant is a long-term birth control method featuring the insertion of six thin flexible tubes that release progestin which prevents pregnancy. ]
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