: The Hipodermia is a practice that as its word indicates it is carried out under the skin and which broadly refers to the use of a needle and a syringe which can be substances inside our body, and also extract liquids for analysis in the laboratory. Tracks most used by the clinician are the 40 Intramuscular; IM ) and route 40 intravenous; IV ) in which the applied substance is left directly in muscle mass or the bloodstream, respectively.