Arm
Arm
Arm (/ɑːrm/; from Old English earm, related to Old Norse armr, both from Proto-Germanic *armuz) is the upper limb of the human body, extending from the shoulder to the hand. It is used for a variety of functions, including manipulation, sensation, and locomotion.
Anatomy
The arm is divided into two main sections: the upper arm, which extends from the shoulder to the elbow, and the forearm, which extends from the elbow to the hand. The upper arm contains one bone, the humerus, while the forearm contains two, the radius and ulna. These bones are connected by various joints, including the shoulder joint and elbow joint.
The arm is also home to many muscles, including the biceps, triceps, and brachialis, which allow for movement and provide strength. It is covered by skin, which contains numerous nerves and blood vessels.
Function
The arm plays a crucial role in many daily activities, such as reaching, lifting, and carrying. It is also important for fine motor skills, such as writing and eating. The arm's range of motion is made possible by the various joints and muscles it contains.
Related Terms
- Elbow: The joint connecting the upper arm and the forearm.
- Wrist: The joint connecting the forearm and the hand.
- Shoulder: The joint connecting the arm and the torso.
- Hand: The end part of the arm, used for manipulation and sensation.
Etymology
The word "arm" comes from the Old English "earm," which is related to the Old Norse "armr." Both words come from the Proto-Germanic "*armuz."
External links
- Medical encyclopedia article on Arm
- Wikipedia's article - Arm
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