Diseases, Conditions, Syndromes

Hand ischemia: When hand pain won't go away

Ischemia can occur anywhere in your body. It's a term to describe what happens when a blood vessel is blocked, preventing blood and oxygen from reaching it. For those with hand ischemia, an inadequate supply of blood to the ...

Sports medicine & Kinesiology

Mayo Clinic minute: What is ulnar wrist pain?

If you have pain on the side of your wrist opposite your thumb, it's called ulnar wrist pain. There are many things that can cause it, and there are several ways to treat it.

Diseases, Conditions, Syndromes

New guidance released for preventing hospital-acquired pneumonia

In the second in series of updates on guidance for infection control in acute-care hospitals, five medical organizations are recommending best practices for preventing hospital-associated pneumonia. Pneumonia is the most ...

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Hand

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