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
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
Midface & cheek
Fat compartments, supraperiosteal depth, infraorbital vessels
- ▪Deep medial cheek
- ▪Zygomatic ligamentous plane
Nose
Dorsal and columellar vessel depth, avascular midline myth
- ▪Dorsal nasal artery
- ▪Supraperiosteal window
Temple
Five-layer temple, STA and MTV depths
- ▪Interfascial plane
- ▪Bone-contact technique
Chin & jawline
Mental and facial artery depth along the mandibular border
- ▪Prejowl sulcus
- ▪Mental foramen mapping
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.