In a traditional head-unit figure construction, the crotch is often marked at the fourth head division down from the top of the head. Treat that as a starting landmark—not a fixed rule. Body proportions vary, and a tilted or foreshortened pose changes how measurements appear.
What the crotch landmark tells you
The crotch marks the transition from the pelvis into the legs in a simplified figure construction. It helps organize the lower body, but it is not an isolated line that determines the form. Place it in relation to the pelvis mass and the direction of each leg.
How the head-unit guide places it
In the adult figure diagram in Figure Drawing, Art Bulletin No. 5, the crotch is at the fourth head division. The manual describes its idealized adult figure as seven and a half to eight heads tall. These are measurements in a drawing scheme, not population averages or guarantees about any individual body.
The manual cautions: “There is a considerable variation from these types in individual figures, and the standard measurements given should not be considered unchangeable.” A later instructional discussion of Loomis’s idealized proportions likewise places the crotch after the head, nipple, and navel divisions; it is another teaching convention, not clinical measurement: Clip Studio Paint’s guide to body proportions.
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For an upright figure
Use the fourth division as a scaffold, then check the reference. Think of the landmark as the pelvis-to-leg junction: account for the pelvis’s shape and how the thighs emerge from it rather than drawing a level line across the body by default.
For a tilted, bent, or foreshortened figure
Do not transfer the upright divisions mechanically. When the body or legs angle toward or away from the viewer, foreshortening changes their apparent lengths. Let the pose reference and visible anatomy guide the placement; use the head-unit scheme only as an initial organizing aid.
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Choosing a proportion approach
| Approach | Useful for | How to apply it |
|---|---|---|
| Head-unit construction | Planning an idealized or upright figure | Use the fourth division as a provisional crotch landmark, then adjust for the figure and pose. |
| Observation from a live or photographic reference | Drawing a specific figure, especially with unusual proportions or a complex pose | Prioritize visible anatomy and the pose over a standard division. |
For more study of idealized figure construction, Andrew Loomis’s Figure Drawing for All It’s Worth includes diagrams that use the crotch as a proportion landmark. Current editions and availability may vary.
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