USMLE Step 1 Review 01 20 Anatomy Wrist Joint Functions

USMLE Step 1 Review 01 20 Anatomy Wrist Joint Functions

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

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Begin 01 20 Anatomy Wrist Joint Functions Transcription

What are the four motions?

  • Extension, flexion, A-B-duction and adduction.

What is the first word of the muscles that provide flexion?

  • Flexor.

What is the first word of the muscles that provide extension?

  • Extensor.

What two words are used to begin different muscles that are combined in A-B-duction and adduction?

  • Flexor and extensor.

For flexion of the wrist joint, we have a muscle on the radial side and a muscle on the ulnar side. What are they?

  • Flexor carpi radialis and flexor carpi ulnaris.

For extension of the wrist joint we have two muscles on the radial side and one muscle on the ulnar side. What are they?

  • Extensor carpi radialis longus and brevis and extensor carpi ulnaris.

For A-B-duction, would the muscles be on the radial side or on the ulnar side?

  • The radial side.

And for adduction, which side?

  • The ulnar side.

For A-B-duction, we have two extensors and one flexor- all on the radial side. What are they?

  • Extensor carpi radialis longus and brevis and flexor carpi radialis.

For adduction, we have a flexor and an extensor, both on the ulnar side. What are they?

  • Flexor carpi ulnaris and extensor carpi ulnaris.

This time, give both the muscles and the nerves.

For flexion?

  • Flexor carpi radialis muscle, median nerve. Flexor carpi ulnaris muscle, ulanr nerve.

For extension of the wrist joint?

  • Extensor carpi radialis longus and brevis/radial nerve. Extensor carpi ulnaris/posterior interosseous nerve, a branch of the radial nerve.

And for A-B-dcuction?

  • Extensor carpi radialis longus and brevis/radial nerve. Flexor carpi radialis/median nerve.

For adduction of the wrist?

  • Flexor carpi ulnaris/ulnar nerve. Extensor carpi ulnaris/posterior interosseous nerve, a branch of the radial nerve.

This time, give muscles, nerves and cord levels.

For flexion of the wrist joint?

  • Flexor carpi radialis by median nerve C6, C7. Flexor carpi ulnaris/ulnar nerve C7, C8.

For extension?

  • Extensor carpi radialis longus and brevis/radial nerve C6, C7. Extensor carpi ulnaris/ posterior interosseous nerve C7, C8.

And for A-B-duction of the wrist joint?

  • Extensor carpi radialis longus and brevis/radial nerve C6-C8. And for flexor carpi radialis/median nerve, C6, C7.

Finally for adduction?

  • Flexor carpi ulnaris/ulnar nerve C7, C8. Extensor carpi ulnaris/posterior interosseous nerve C7, C8.

Let’s turn it around. I’ll give the muscles; you give the motion, nerve and cord levels.

Extensor carpi radialis longus and brevis and flexor carpi radialis?

  • A-B-duction. Extensor carpi radialis longus and brevis by the radial nerve C6-C8. Flexor carpi radialis by median nerve C6, C7.

For flexor carpi ulnaris and extensor carpi ulnaris?

  • Adduction. Flexor carpi ulnaris by ulnar nerve C7, C8. Extensor carpi ulnaris by posterior interosseous nerve C7, C8.

Extensor carpi radialis longus and brevis and extensor carpi ulnaris?

  • Extension. Extensor carpi radialis longus and brevis by radial nerve C6, C7. Extensor carpi ulnaris by posterior interosseous nerve C7, C8.

For flexor carpi radialis and flexor carpi ulnaris?

  • Flexion. Flexor carpi radialis by median nerve C6, C7. Flexor carpi ulnaris by ulnar nerve C7, C8.

Student-doctor, please pause the tape here and summarize the motions of the wrist joint. Give the muscles, the nerves and the cord levels- again, starting with the motions.

  • The four motions of the wrist joint are flexion, extension, A-B-duction and adduction. Flexion is via the flexor carpi radialis and flexor carpi ulnaris muscles. Flexor carpi radialis by median nerve C6, C7 and flexor carpi ulnaris by ulnar nerve C7, C8. Extension of the wrist joint is by extensor carpi radialis longus and brevis and extensor carpi ulnaris muscles. Longus and brevis muscles are by the radial nerve C6, C7 and extensor carpi ulnaris is by the posterior interosseous nerve, a branch of the radial nerve C7, C8. A-B-duction of the wrist joint is by the extensor carpi radialis longus and brevis and flexor carpi radialis muscles. Longus and brevis muscles by the radial nerve C6-C8 and flexor carpi radialis by median nerve C6, C7. Adduction of the wrist joint is by the flexor carpi ulnaris and extensor carpi ulnaris muscles. Flexor carpi ulnaris by ulnar nerve C7, C8 and extensor carpi ulnaris by posterior interosseous nerve, a branch of the radial nerve C7, C8.

****END OF TRANSCRIPTION****

 

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