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Capuchin monkeys are known to exhibit sporadic bipedalism while performing specific tasks, such as cracking nuts. The bipedal posture and locomotion cause an increase in the metabolic cost and therefore increased blood supply to lower limbs is necessary. Here, we present a detailed anatomical description of the capuchin arteries and veins of the pelvic limb of  Sapajus libidinosus  in comparison with other primates. The arterial pattern of the bearded capuchin hind limb is more similar to other quadrupedal  Cebus  species. Similarities were also found to the pattern observed in the quadruped  Papio , which is probably due to a comparable pelvis and the presence of the tail.  Sapajus ' traits show fewer similarities when compared to great apes and modern humans. Moreover, the bearded capuchin showed unique patterns for the femoral and the short saphenous veins. Although this species switches easily from quadrupedal to bipedal postures, our results indicate that the bearded capuchin has no specific or differential features that support extended bipedal posture and locomotion. Thus, the explanation for the behavioral differences found among capuchin genera probably includes other aspects of their physiology.

biomed research international

Comparative Anatomy of the Hind Limb Vessels of the Bearded Capuchins (<i>Sapajus libidinosus</i>) with Apes, Baboons, and<i>Cebus capucinus</i>: With Comments on the Vessels' Role in Bipedalism

Comparative Anatomy of the Hind Limb Vessels of the Bearded Capuchins (Sapajus libidinosus) with Apes, Baboons, andCebus capucinus: With Comments on the Vessels' Role in Bipedalism