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Encyclopedia > Posterior compartment of the arm
Posterior compartment of the arm
Cross-section through the middle of upper arm.
Artery profunda brachii
Nerve muscular branches of the radial nerve

The posterior compartment of the arm contains muscles which are all supplied by the radial nerve. This compartment is also known as the "extensor compartment", extension being its main action. Image File history File links Gray413. ... Section of an artery For other uses, see Artery (disambiguation). ... The arteria profunda brachii is a large vessel which arises from the medial and back part of the brachial, just below the lower border of the Teres major. ... Nerves (yellow) Nerves redirects here. ... The muscular branches of the radial nerve supply the Triceps brachii, Anconæus, Brachioradialis, Extensor carpi radialis longus, and Brachialis, and are grouped as medial, posterior, and lateral. ... The radial nerve is a nerve in the human body, that supplies the arm, the forearm and the hand. ...


The muscles of this compartment are the triceps brachii and anconeus muscle. Triceps brachii The triceps brachii muscle is a large three-headed skeletal muscle found in humans. ... The anconeus muscle is a small muscle on the posterior surface of the elbow. ...

  • The triceps brachii is a large muscle containing three heads (lateral, medial, and middle).
  • The anconeus is a small muscle stabilizes the elbow joint during movements. Some embryologists consider it as the fourth head of the triceps brachii. As the upper and lower limbs have similar embryological origins and the lower limb contains the quadriceps femoris muscle (the lower limb equivalent of the triceps), which has four heads, this would seem to make sense.

This article or section is in need of attention from an expert on the subject. ... ...

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