USMLE Step 1 Review 01 16 Anatomy Elbow Function

USMLE Step 1 Review 01 16 Anatomy Elbow Function

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Let’s continue our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.

Play USMLE Audio MP3 01 16 Anatomy Elbow Function Below


Begin 01 16 Anatomy Elbow Function Transcription

What are the four motions involved in elbow function?

  • Extension, flexion, pronation and supination.

Muscles and nerves for extension?

  • Triceps brachii/radial nerve and anconeus muscle/radial nerve.

Muscles and nerves for flexion of the elbow?

  • Biceps brachii/musculocutaneous nerve and brachioradialis muscle/radial nerve.

For pronation of the forearm?

  • Pronator teres and pronator quadratus muscles, both by the median nerve.

Supination of the forearm?

  • Biceps brachii/musculocutaneous nerve and supinator muscle/radial nerve.

Let’s turn it around.What’s the motion?

Biceps brachii and brachioradialis?

  • Flexion of the elbow.

Pronator teres and pronator quadratus?

  • Pronation of the forearm.

Biceps brachii and supinator muscle?

  • Supination.

Triceps brachii and anconeus muscle?

  • Elbow extension.

Let’s make it a little harder. This time I’ll just give the minor muscle, you give the motion.


  • Flexion.


  • Extension.

What is it when biceps brachii is the minor muscle involved?

  • Supination.

And what is it when the minor muscle has quadratus in the name?

  • Pronation.

Let’s take it just with the nerves. What are the two nerves involved with flexion of the elbow?

  • Musculocutaneous and radial nerve.

Which nerve with extension of the elbow?

  • The radial nerve.

What are the two nerves involved with supination of the forearm?

  • The radial and musculocutaneous nerves.

What is the nerve involved with pronation of the forearm?

  • The median nerve.

Student-doctor, please pause the tape and summarize for elbow function. Give the four motions and then give the muscles and the nerves.

  • Flexion and extension of the elbow, pronation and supoination of the forearm. For flexion, biceps brachii/musculocutaneous nerve, brachioradialis/radial nerve. For extension, triceps brachii/radial nerve, anconeus muscle/radial nerve. Pronation, pronator teres and pronator quadratus, both by median nerve. And supination, biceps brachii/musculocutaneous and supinator muscle/radial nerve.



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