USMLE Step 1 Review 01 09 Anatomy Branchial Arch Derivations

USMLE Step 1 Review 01 09 Anatomy Branchial Arch Derivations

 

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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 09 Anatomy Branchial Arch Derivations Below

 

Begin 01 09 Anatomy Branchial Arch Derivations Transcription

What is the key concept?

  • By function.

Structures of branchial arch 1, there’s a primary function and a shared function. What are they?

  • Primary function is mastication, shared function is hearing.

Branchial arch 2 has a primary function, a shared function with arch 1 and a shared function with arch 3. What are they?

  • Primary function is facial expression, shared with 1 is hearing, shared with 3 is swallowing.

Branchial arch 3 has a shared function with 2. What is it?

  • Swallowing.

Branchial arch 4 has two shared functions with 3 and 6. What are these?

  • Shared with 3 is swallowing, shared with 6 is speaking.

Branchial arch 6 has a shared function with 4. What is it?

  • Speaking.

What function is shared by branchial arches 1 and 2?

  • Hearing.

Point of clarification: Branchial arches 1 and 2 do not make up all the hearing apparatus. It’s just that both of these arches contribute some of the structures of the apparatus.

What was the primary function of branchial arch 1?

  • Mastication.

What is the primary function of branchial arch 2?

  • Facial expression.

What is the function shared by branchial arches 3 and 4?

  • Swallowing.

What is the function shared by branchial arches 4 and 6?

  • Voice.

Please give the functions in order, starting with hearing.

  • Hearing, mastication, facial expression, swallowing, voice.

What two branchial arches are involved in swallowing?

  • 3 and 4.

What branchial arch is involved with facial expression?

  • 2.

Which arch is mastication?

  • 1

Which two arches share voice?

  • 4 and 6.

And what two branchial arches participate in hearing?

  • 1 and 2.

****END OF TRANSCRIPTION****

 

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