Many different categories of human anatomy have been described, most of which relate to the instrument being used and the ensuing treatment or therapy (ex. surgical anatomy, radiological anatomy, etc.).  

Injection anatomy, not previously described, is centered on the fact that a syringe and needle are to be utilized, rather than a scalpel.  Where the tip of the needle resides (from which the product will flow) once under the skin is crucial.  Injecting under the skin involves encountering vital structures.  Knowledge of injection anatomy therefore pertains to the depth of injection as it relates to the location of the tip of the needle. Injection anatomy can be defined as the study of regional anatomy as it relates to surface landmarks and the underlying depth of targeted tissue and vital structures.  Although a myriad of vascular patterns exist in two dimensions, there is relative consistency in the depth (3rd dimension) at which vessels pass through the tissues in specific geographical regions of the face.   Appreciating the depth location of the tip of the needle, although not infallible, should guide treatment into “safer” lower risk zones for specific facial regions.  The clinician’s ability to delineate these facial anatomical zones at the time of treatment is limited to visual and palpable topographical assessment.  To this end, five bony and 2 soft tissue landmarks must be discerned which will divide the face into specific treatment regions according to depth.

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