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    HSI Reference Series

    Injection Anatomy

    Not articles. Data sheets. Surface anatomy you can mark, layer anatomy you can measure, and vessel depths in millimetres — mapped compartment by compartment.

    Measured in millimetres from the surface you inject through

    Layer-by-layer, with the plane each technique actually occupies

    Vessel windows expressed as probability, not as safe zones

    Modules

    live

    Lips

    Surface anatomy · layer anatomy · labial artery depth by compartment

    • ▪4 mirrored compartments per lip
    • ▪Artery depth 3.5–9 mm mapped
    • ▪Safe corridor ≤2.5 mm
    in preparation

    Midface & cheek

    Fat compartments, supraperiosteal depth, infraorbital vessels

    • ▪Deep medial cheek
    • ▪Zygomatic ligamentous plane
    in preparation

    Nose

    Dorsal and columellar vessel depth, avascular midline myth

    • ▪Dorsal nasal artery
    • ▪Supraperiosteal window
    in preparation

    Temple

    Five-layer temple, STA and MTV depths

    • ▪Interfascial plane
    • ▪Bone-contact technique
    in preparation

    Chin & jawline

    Mental and facial artery depth along the mandibular border

    • ▪Prejowl sulcus
    • ▪Mental foramen mapping
    in preparation

    Tear trough & periocular

    Preseptal vs prezygomatic depths, angular vessels

    • ▪Sub-orbicularis plane
    • ▪Angular artery variance

    Editorial standard

    Every figure in this series is built from published cadaveric, CT-angiographic and ultrasound data. Ranges are probability windows, not boundaries — anatomy varies, prior filler distorts planes, and ultrasound remains the only way to confirm depth in an individual patient. Depth is always paired with entry angle and vector, because a millimetre reading without geometry is not reproducible.

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