: A layer of adipose (fatty) tissue between the skin and muscle. It has less blood flow than muscle, allowing for slower, more sustained medication absorption (e.g., insulin or heparin).
: The target for intravenous (IV) injections, providing immediate delivery into the bloodstream for emergencies or rapid fluid replacement. Anatomical Landmarks for Intramuscular (IM) Sites
Successful injection begins with understanding the distinct tissue planes. Each layer has unique vascularity and absorption characteristics that dictate its clinical use.
: Highly vascularized tissue used for intramuscular (IM) injections. The rich blood supply enables rapid systemic absorption.
: The outermost layers used for intradermal (ID) injections. This area is highly immunological, making it ideal for allergy and tuberculosis testing.