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Four to eight millimetres in, and the plane every cannula is aimed at: the superficial veins run in the fat, above the deep fascia, which is why they roll under the needle and why a line that has gone too deep stops flowing.
Move the plane down through the arm; structures are coloured by tissue type, with the clinical consequence under each.
Anatomy is mostly a question of depth: what is under the needle at this level, which nerve a fracture here takes with it. An atlas shows one static plane at a time. The block below lets you move the plane and colours structures by tissue type, because the useful rules (a bundle travels together, the compartment predicts the nerve) are about types, not labels.
You describe the goal in your own words and the plan asks questions back until it is one you would follow. Goals usually look like these.
There is no fixed syllabus. The plan is built around your goal and drops what it does not need. These are the topics it draws from.
Each one has its own lesson block to try.
See how it works and what it costs.