Diseases, Conditions, Syndromes

Can you die from a common cold?

Most people know that the flu can kill. Indeed, the so-called Spanish flu killed 50 million people in 1918—more than were killed in the first world war. But what about the common cold? Can you really catch your death?

Health

The dirtiest things you touch

At this time of year, cold and flu season mixes with holiday shopping, parties and travel. That means extra opportunities to share holiday cheer—and germs and viruses. However, you may be surprised by how germ-filled common ...

Cardiology

Can an Apple Watch tell if you had a heart attack?

An electrocardiogram (ECG) generated by the Apple Watch series 4 or 5 could potentially be used to diagnose a heart attack when a specific method of obtaining the ECG is used and the results are reviewed by a specialist. ...

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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