On World No Tobacco Day, May 31, 2023, the Forum of International Respiratory Societies (FIRS), of which The American Thoracic Society is a founding member, is encouraging policy makers to take steps to prevent young people ...
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Food workers who showed up while sick or contagious were linked to about 40% of restaurant food poisoning outbreaks with a known cause between 2017 and 2019, federal health officials said Tuesday.
May 30, 2023
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Most people are familiar with psychiatric disorders such as schizophrenia and bipolar disorder, but some conditions are so rare that many psychiatrists won't come across a single case in their professional lives. Here I present ...
May 24, 2023
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Researchers from University of California San Diego have found a way to distinguish among hand gestures that people are making by examining only data from noninvasive brain imaging, without information from the hands themselves. ...
May 20, 2023
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One-year findings from the Distal versus Proximal Radial Artery Access for Cardiac Catheterization and Intervention (DIPRA) study were presented as late-breaking clinical research at the Society for Cardiovascular Angiography ...
May 18, 2023
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The sensory information provided by hands facilitates the processing of visual stimuli. Before hand movements, the brain first perceives and interprets sensory information, then selects the appropriate motor plan before initiating ...
May 18, 2023
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My 4-year-old son has had many episodes of painful sore throats, and his doctor recommended that his tonsils be removed. Why do kids have more trouble with their tonsils? Is there a right age to have the surgery done? I've ...
May 16, 2023
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Scientists at Université de Montréal, McGill University and its affiliated Montreal Children's Hospital have made a promising breakthrough in understanding the origins of mirror movement disorder, a rare inherited neurological ...
May 15, 2023
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We carry them everywhere, take them to bed, to the bathroom and for many people they're the first thing they see in the morning—more than 90% of the world owns or uses a mobile phone and many of us couldn't manage without ...
Apr 25, 2023
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It may be hard to believe as you reach for yet another tissue, but you don't have to suffer with the itchy eyes and stuffy noses that seasonal allergies bring.
Apr 17, 2023
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A hand (med./lat.: manus, pl. manūs) is a prehensile, multi-fingered extremity located at the end of an arm 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 remarkably similar to human fingerprints) are often described as having either "hands" or "paws" on their front limbs.
Hands are the chief organs for physically manipulating the environment, used for both gross motor skills (such as grasping a large object) and fine motor skills (such as picking up a small pebble). The fingertips contain some of the densest areas of nerve endings on the body, are the richest source of tactile feedback, and have the greatest positioning capability of the body; thus the sense of touch is intimately associated with hands. Like other paired organs (eyes, feet, legs), each hand is dominantly controlled by the opposing brain hemisphere, so that handedness, or the preferred hand choice for single-handed activities such as writing with a pen, reflects individual brain functioning.
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 hand has 27 bones, 14 of which are the phalanges (proximal, medial, and distal) of the fingers. The metacarpal is the bone that connects the fingers and the wrist. Each human hand has 5 metacarpals.
This text uses material from Wikipedia, licensed under CC BY-SA
