USMLE FREE QUIZ

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.

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Branchial arch 6 has a shared function with 4. What is it?
Speaking.
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Also, on branchial arch 4 we have a single muscle that participates in voice.
What is it?
The cricothyroid muscle.

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What skeletal structure has moved cranial during development to cause the recurrent laryngeal branch to be trapped underneath the arch of the aorta and the right subclavian artery?
The larynx.
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USMLE Step 1 Review 01 03 Anatomy Derivations from the Endoderm

[/color][/color] https://www.youtube.com/user/ApolloUSMLEStep1

https://www.youtube.com/watch?v=QE9mOINxfRY&list=PLB3EC2D1440FEF502

USMLE Step 1 Review 25 03 Neuroanatomy Embryology
https://www.youtube.com/watch?v=Rs3ypWS04qA&list=PLA6CDF909D8F567D5



The branchial pouch derivations are of what embryological origin?
Endodermic.
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What is the main structure for pharyngeal pouch 1?
The middle ear.
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And what’s the main structure for pharyngeal pouch 5?
Parafollicular C cells of the thyroid gland.
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What’s the main structure for pharyngeal pouch 3?
Thymus and inferior parathyroids
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What’s the main structure for pharyngeal pouch 4?
Superior parathyroids or dorsal wings.
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This time, I’ll give the structure and you respond with the pharyngeal pouch number.
Tonsils?
Pouch 2.
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USMLE Step 1 Review 01 03 Anatomy Derivations from the Endoderm

MANY EMBRYOLOGY VIDEOS
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https://www.youtube.com/watch?v=aqQccrNV-pA&list=PL553A39BC0B7DE3DA