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Proximal-Distal Axis

The proximal-distal axis runs from the center of the crab to the exterior. It generall describes whether something is close or far from the center. Proximal (near) refers toward the center of the crab. Distal (away) refers toward the parts away from the center. The limbs attach to the body at their proximal ends; the tips of the limbs are the distal ends.

Illustration of the proximal-distal axis. Figure modified from Crane (1975). image
Illustration of the proximal-distal axis. Figure modified from Crane (1975).
The proximal and distal ends of the walking legs. Figure modified from Crane (1975). image
The proximal and distal ends of the walking legs. Figure modified from Crane (1975).