USMLE Step 1 Review 01 07 Anatomy Branchial Clefts, Arches and Pouches

USMLE Step 1 Review 01 07 Anatomy Branchial Clefts, Arches and Pouches

 

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

The idea is that you can review for the USMLE online by:

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  • Following along with the transcription
  • Or by watching the video (if 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 07 Anatomy Branchial Clefts, Arches and Pouches Below

 

Begin 01 07 Anatomy Branchial Clefts, Arches and Pouches Transcription

In terms of external, internal or in the middle, what are branchial arches in this picture?

  • They’re in the middle.

What is external?

  • The branchial cells.

What is internal?

  • The branchial pouches.

The branchial clefts being external, what type of embryonic tissue?

  • Ectodermic.

The branchial arches being in the middle, what kind of embryonic tissue?

  • Mesodermic.

The branchial pouches being internal, what kind of tissue?

  • Endodermic

What are the five branchial arches?

  • Arches 1, 2, 3, 4 and 6.

What happened to number five?

  • It has disappeared in humans.

What are the branchial pouches?

  • Pouches 1, 2, 3, 4 and 5.

Branchial pouch 1 gives rise to what three structures?

  • Lining of the middle ear cavity, Eustachian tube and mastoid air cells.

Branchial pouch 2 gives rise to what structure?

  • Epithelial lining of palatine tonsil.

Branchial pouch 3 gives rise to what two glands?

  • The inferior parathyroids and the thymus.

Branchial pouch 4 gives rise to what gland?

  • Superior parathyroids.

And branchial pouch 5 gives part to what part of what gland?

  • The parafollicular C cells of the thyroid.

****END OF TRANSCRIPTION****

 

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