USMLE Step 1 Review 01 19 Anatomy Ankle Function

USMLE Step 1 Review 01 19 Anatomy Ankle Function

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  • USMLE Audio Review files from our “Gold Standard USMLE Reviews”
  • Transcriptions of those files
  • And videos (as they become available)

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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 19 Anatomy Ankle Function Below

 

Begin 01 19 Anatomy Ankle Function Transcription

What are the four motions for foot and ankle function?

  • Plantar flexion, dorsiflexion, eversion or A-B-duction and inversion or adduction.

What are the muscles, nerves and levels for plantar flexion of the ankle?

  • Gastrocnemius and soleus muscles, both by the tibial nerve S1, S2.

Muscles, nerves and levels for dorsiflexion?

  • Tibialis anterior and extensor digitorum longus muscles, both by deep peroneal nerve L4-S1.

And for eversion or abduction, A-B-duction?

  • Peroneus longus and brevis muscles by the superficial peroneal nerve L4-S1.

For inversion or adduction of the foot and ankle?

  • Tibialis anterior muscle by the deep peroneal nerve L4-S1 and tibialis posterior by the tibial nerve L5-S1.

Let’s turn it around. I’ll give the muscle, please give the motion, nerve and levels.

Tibialis anterior muscle and extensor digitorum longus muscle?

  • These cause dorsiflexion of the foot, both innervated by the deep peroneal nerve, L4-S1.

Tibialis anterior muscle and tibialis posterior muscle?

  • These cause inversion or adduction of the foot. Tibialis anterior is by the deep peroneal nerve L4-S1. Tibialis posterior is by the tibial nerve L5-S1.

Peroneus longus and brevis muscles?

  • These muscles cause eversion or A-B-duction of the foot. Both are by the superficial peroneal nerve L4-S1.

For the gastrocnemius and soleus muscles?

  • These cause plantar flexion of the foot. Both are innervated by the tibial nerve S1, S2.

Student-doctor, please pause the tape and summarize for the ankle joint, the motions of the foot, the muscles, nerves and levels. Start with the motions.

  • In ankle function, the foot moves through plantar flexion, dorsiflexion, eversion or A-B-duction and inversion or adduction. For planter flexion, muscles are gastrocnemius and soleus, both are innervated by the tibial nerve S1, S2. For dorsiflexion, the two muscles are the tibialis anterior and the extensor digitorum longus, both innervated by the deep peroneal nerve L4-S1. For eversion or A-B-duction, muscles are peroneus longus and brevis, innervated by the superficial peroneal nerve L4-S1. And for inversion or adduction, muscles are tibialis anterior and posterior, anterior innervated by the deep peroneal nerve L4-S1 and posterior by tibial nerve L5-S1.

****END OF TRANSCRIPTION****

 

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