Skin biology: architecture, ageing & regional anatomy
A layer-by-layer structural framework for the skin — from epidermis to hypodermis — covering the cell types, regional variation, and ageing mechanisms that determine treatment selection and depth of delivery in aesthetic practice.
4 units
~8 min each
12 checkpoints
Level: All practitioners — tiered content
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Unit 1
Skin Architecture & the Epidermis
The three-layer structural framework of skin and a layer-by-layer walk through the epidermis, from the stratum basale's continuous renewal to the stratum corneum's barrier function.
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Unit 2
The DEJ & the Dermis
The dermal–epidermal junction as a functional interface, and the papillary and reticular dermis as the structural and biochemical scaffold behind every collagen-stimulating treatment.
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Unit 3
Hypodermis & Cell Types
Facial fat compartments and filler plane selection, plus the specialised skin cells — from melanocyte to macrophage — that determine treatment response and complication risk.
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Unit 4
Regional Variation & Ageing
Why face, neck and décolletage demand different treatment parameters, and the biological distinction between intrinsic and extrinsic skin ageing.
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Each unit follows the same rhythm: a short piece of clinical content, a checkpoint that asks you to commit to an answer, then the reasoning behind it. Checkpoints are not scored and cannot be retried — committing to a position before seeing the answer is the point of the exercise. Your progress is stored on this device only.