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THE UNIVERSITY OF CALGARY Eric Snively A ... - Ohio University

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Figure 3.10. Step sequence of Gorgosaurus libratus metatarsus in<br />

lateral view, showing forces acting upon bones and ligaments<br />

during linear locomotion. Metatarsal images are not free body<br />

diagrams, because forces are not in equilibrium. Silhouettes<br />

depict the tyrannosaurid at appropriate locomotory stages.<br />

Green=tensile forces on ligaments. Yellow=Extemal force<br />

resultants on bone. Red=muscle forces.<br />

a: prior to footfall, ligaments suspend metatarsus and toes; flexor<br />

muscles draw toes forward.<br />

b-e: Differential forces on Metatarsal III and outer metatarsals<br />

stretch interrnetatarsal ligaments, which retum elastic strain<br />

energy. For clarity, displacement of MT III is exaggerated, and<br />

articulating bones and bending components are omitted.

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