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The elbow flexors are: 1) biceps, 2) brachioradialis and 3) brachialis. These muscles are shown in Figure 1 below:

Abductor Muscles

Figure 1. Elbow Flexors.


The nerve supply to the biceps is from the musculocutaneous nerve and is from branches C5-C7 of the brachial plexus. The nerve supply to the brachioradialis is the from the C5 and C6 branches of the radial nerve. The nerve supply to the brachialis is the musculocutaneous nerve and part of the radial nerve. See Figure 2.

Abductor Nerves

Figure 2. Brachial plexus showing the Musculocutaneous and Radial Nerve.


The biceps, brachioradialis and brachialis muscles function to flex the forearm on the arm at the elbow joint. This movement is common during exercises that involve arm curls.

Abductors Starting Postiion
Figure 3. Beginning position of arm curl.

Abductors Ending
Figure 4. Ending position of arm curl.


Always glad to help, and remember, at, “We’ll bring you up to speed!” ™
Dr. Larry Van Such

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