Comparative anatomy of the sp. (bearded capuchin) hand with comments on tool use in a parallel evolution with the hominid pathway.

Bearded capuchins display a wide variety of manipulatory skills and make routine use of tools in both captivity and the wild. The efficient handling of objects in this genus has led several investigators to assume near-human thumb movements, despite a lack of anatomical studies. Here, we performed an anatomical analysis of muscles and bones in the capuchin hand.

Differences among the forelimb arteries in groups of primates and a mathematical model explanation.

Background: Recently, some studies about primates have claimed the importance of the vessels to maintain the muscles working; in fact, the arterial supply could suggest how strenuous the muscular performance is associated to locomotor behavior. The aim of this work was to study the anatomy of the arteries of the forelimbs of different groups of primates to evidence a general arterial model in comparative terms.

Methods: We propose a biophysical explanation for the arterial pattern of the forelimbs of primates' groups.

Comparative Gross Anatomy of the Forelimb Arteries of the Japanese Monkey () and a Comparative Pattern of Forelimb Arterial Distribution in Primates.

displays characteristic behaviours, such as stone handling, locomotor behaviour, gait position, and intermittent bipedalism. Differences in characteristic behaviours among primate species/genera could be explained by anatomical details of the body. However, the anatomical details have not been well studied in .