What is the triceps called?

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It is called the triceps brachii. Gray's Anatomy (1918) describes it as a three-headed muscle on the back of the upper arm.

Summary

It is called the triceps brachii. Gray's Anatomy (1918) describes it as a three-headed muscle on the back of the upper arm.

What it is

  • A three-headed muscle on the back of the upper arm.
  • One head arises from the scapula and two from the humerus.
  • Straightens the elbow.

Where it is

  • On the back of the upper arm.
  • Between the shoulder and the elbow.
  • Inserts by a broad tendon into the olecranon of the ulna.

Sources

According to Gray's Anatomy of the Human Body (1918, public domain):

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