The thumb is the first digit finger of the hand. When a person is standing in the medical anatomical position where the palm is facing to the frontthe thumb is the outermost digit. The Medical Latin English noun for thumb is pollex compare hallux for big toeand the corresponding adjective for thumb is pollical.
At a glance, the human and primate hands may seem nearly identical. They share a number of characteristics and both can grasp and perform a number of other functions. But several differences set the two hands apart.
For centuries, people have used the human body, and the hand in particular, as an inspiration and blueprint for engineering innovations. But copying the human hand hasn't been easy. Its complex muscular and skeletal structure offers a unique, tricky balance: It is dexterous, stable and precise, but also fast moving, strong and flexible.
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The trapezium bone greater multangular bone is a carpal bone in the hand. It forms the radial border of the carpal tunnel. The trapezium is distinguished by a deep groove on its anterior surface.
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Raccoons are famous break-in artists. No chimney flue, garbage can, or campground cooler is safe from their prying hands. Raccoons have remarkably sensitive hands, with five long, tapered fingers and long nails.
Hold your hand out in front of you and look at it carefully. The human hand is made up of four fingers and one thumb. Have you ever thought about how much you use your thumb?
Hand evolution The development of an opposable thumb that enables humans to grip and manipulate objects is widely believed to give us an evolutionary edge. But new research finds that human hands are more primitive than those of our closest primate ancestors chimpanzees. The study, published in the the journal Nature Communicationsfound that human hand proportions have changed little from those of the last common ancestor of chimps and humans, while the hands of chimps and orangutans have evolved quite a bit.
With three exceptions, all primates have retained five digits on hand and foot. The exceptions are the spider monkeys and the so-called woolly spider monkey of South America and the colobus monkeys of Africa, which have lost or reduced the thumb. This appears to be an adaptation for locomotion, the rationale for which is not fully understood at present. All, though to different degrees, possess prehensile grasping hands and all except humans prehensile feet.