Q:

What is the lower arm bone called?

A:

Quick Answer

The forearm consists of two parallel bones, the radius and the ulna. The radius is slightly shorter, running from the thumb side of the wrist to the elbow. The ulna is longer, running from the little finger side of the wrist to the elbow.

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Full Answer

The radius and the ulna are connected by the interosseous membrane. Together they are referred to as the radioulnar joint. The radius provides an anchor for the muscles of the upper arm, while the muscles anchored to the ulna provide movement of the arm, hand and wrist. The muscles that attach to both bones are required for everyday activities.

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Related Questions

  • Q:

    How many bones are in the human arm?

    A:

    According to Healthline, the human arm is composed of three bones, divided amongst two anatomical sections. The upper arm or brachium, which is the region between the shoulder and elbow joint, contains the humerus. The forearm or antebrachium contains two parallel bones, the radius and ulna.

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  • Q:

    What is a corticated bone?

    A:

    Cortical bone is a dense and rigid layer of calcium-rich osseous tissue that makes up the outer layer of a bone, explains InnerBody. This compact bone layer is cylindrical in shape with a honeycombed structure, providing thousands of tiny canal-like passageways for nerves and blood vessels.

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    What is the composition of bone?

    A:

    Living bone contains about 10 to 20 percent water and 60 to 70 percent bone mineral, as explained by the University of Cambridge. The remaining material is mostly collagen with trace amounts of proteins and inorganic salts.

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    What is a bone spur?

    A:

    A bone spur is a piece of bone that grows out from another bone, such as the heel bone or the vertebrae. Some bone spurs are asymptomatic and don't have to be treated. Other bone spurs, such as those that develop in Haglund's syndrome, are quite painful.

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