Help

Getting around

To… Mouse Touch Keyboard
Rotate Drag One finger Arrow keys
Zoom Scroll Pinch + / −
Pan Right-drag Two fingers —
Select a part Click Tap Search with /
Reset the view — — R

Peeling layers

Use the Layers panel to set each system On, Faint or Off, or press Peel a layer to remove the outermost layer each time.

Looking closely

Select a part, then use Isolate (just that part), With skeleton (that part plus a faint skeleton) or Just this region. Hide removes a part; Show all brings everything back, and Undo (Ctrl/⌘+Z) steps back.

Sharing

Share copies a link (or opens your phone's share sheet) that reopens exactly what you are looking at: the angle, layers and card.

Saving an image

Save image downloads a picture of your current view with a small credit line.

Offline

Marrow can be installed as an app. Supporters and schools can download everything for offline use.