USMLE Step 1 Review 01 11 Anatomy Summaries from Branchial Arch Derivations

USMLE Step 1 Review 01 11 Anatomy Summaries from Branchial Arch Derivations

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  • Transcriptions of those files
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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 11 Anatomy Summaries from Branchial Arch Derivations Below

 

Begin 01 11 Anatomy Summaries from Branchial Arch Derivations Transcription

Student-doctor, for branchial arch 1, please summarize function, muscles and nerve.

  • Branchial arch 1, the primary function is mastication via the muscles of mastication innervated by the mandibular division of the trigeminal nerve, cranial nerve V3.

Please summarize in the same way for branchial arch 2.

  • Branchial arch 2, primary function is facial expression by the muscles of facial expression innervated by the facial nerve, cranial nerve 7.

Please summarize for branchial arch 3, the function, muscles, artery and nerve.

  • Branchial arch 3, primary function is swallowing, muscle is stylopharyngeus, nerve is the glossopharyngeal nerve, cranial nerve 9, artery is the common carotid artery.

Please summarize for branchial arch 4 the two shared functions, muscles, the nerve, the skeletal element and the two cardiovascular structures. You might want to pause the tape here to do this.

  • Branchial arch 4, two shared functions are swallowing and voice. The muscles for swallowing are the constrictors of the pharynx, the muscle of the voice is the one for pitch and inflexion, the cricothyroid. Innervation is via the superior laryngeal branch of the vagus nerve, cranial nerve 10. Skeletal element is some of the laryngeal cartilages making up the larynx and the cardio vascular elements are on the left, the arch of the aorta and on the right, the right subclavian artery.

Student-doctor, please pause the tape here and summarize for branchial arch 6, the primary function, the two sets of muscles innervated by two different nerves and the skeletal element.

  • Branchial arch 6, the primary function is producing the voice vibration itself via the intrinsic muscles of the larynx including the vocal cords. Innervation to the intrinsic muscles of the larynx is via the recurrent laryngeal branch of vagus nerve, cranial nerve 10. The other muscles of arch 6 are the sternocleidomastoid and the trapezius, innervated by cranial nerve 11, the spinal accessory nerve. And the skeletal element is laryngeal cartilages of the rest of the larynx.

****END OF TRANSCRIPTION****

 

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