People who have smaller fingers have a finer sense of touch, according to new research in the Dec. This finding explains why women tend to have better tactile acuity than men, because women on average have smaller fingers. To learn why the sexes have different finger sensitivity, the authors first measured index fingertip size in university students. Each student's tactile acuity was then tested by pressing progressively narrower parallel grooves against a stationary fingertip -- the tactile equivalent of the optometrist's eye chart. The authors found that people with smaller fingers could discern tighter grooves. The authors also explored why more petite fingers are more acute.
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Prosthetic Fingers Help Reform Japan's Feared Yakuza Gangsters
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Hand - Wikipedia
A prosthetics maker never expected his job to lead him to the underworld. The prosthetics maker built a career making silicone body parts for patients with breast cancer, or legs and arms for those injured in serious accidents. But a decade ago, he started to notice a change in the clientele at his Tokyo-based company, Aiwa Gishi. In Japan, a stunted pinkie signifies membership in the yakuza, or Japanese mafia. In a ritual known as "yubitsume," yakuza members are required to chop off their own digits to atone for serious offenses. The left pinkie is usually the first to go, though repeated offenses call for further severing.
Ichthyosis
Back to Health A to Z. Ichthyosis is a condition that causes widespread and persistent thick, dry, "fish-scale" skin. There are at least 20 different types of ichthyosis. Some types are inherited at birth and other types are acquired during adulthood. There's no cure for ichthyosis, but a daily skincare routine usually keeps the symptoms mild and manageable.
A hand is a prehensile , multi- fingered appendage located at the end of the forearm or forelimb of primates such as humans , chimpanzees , monkeys , and lemurs. A few other vertebrates such as the koala which has two opposable thumbs on each "hand" and fingerprints extremely similar to human fingerprints are often described as having "hands" instead of paws on their front limbs. The raccoon is usually described as having "hands" though opposable thumbs are lacking. Some evolutionary anatomists use the term hand to refer to the appendage of digits on the forelimb more generally—for example, in the context of whether the three digits of the bird hand involved the same homologous loss of two digits as in the dinosaur hand. The human hand usually has five digits: four fingers plus one thumb ; [3] [4] these are often referred to collectively as five fingers, however, whereby the thumb is included as one of the fingers.
