Pharyngeal arch, pouch, and cleft derivatives and their associated congenital defects tested on USMLE Step 1.
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- Which cartilage gives rise to skeletal structures of the 1st pharyngeal arch?
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Meckel's cartilage- Which cranial nerve supplies the 1st pharyngeal arch?
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CN V (trigeminal), mainly the mandibular division V3- Which two ear ossicles derive from the 1st pharyngeal arch?
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Malleus and incus- What major muscle group derives from the 1st pharyngeal arch?
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Muscles of mastication- Which facial bone derives from 1st arch cartilage?
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Mandible- Which 1st arch muscle dampens sound by tensing the tympanic membrane?
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Tensor tympani- Which cartilage gives rise to skeletal structures of the 2nd pharyngeal arch?
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Reichert's cartilage- Which cranial nerve supplies the 2nd pharyngeal arch?
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CN VII (facial)- Which ear ossicle derives from the 2nd pharyngeal arch?
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Stapes- What major muscle group derives from the 2nd pharyngeal arch?
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Muscles of facial expression- Which cranial nerve supplies the 3rd pharyngeal arch?
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CN IX (glossopharyngeal)- Which skeletal structure derives from the 3rd pharyngeal arch?
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Greater horn and lower body of the hyoid bone- Which muscle derives from the 3rd pharyngeal arch?
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Stylopharyngeus- Which branch of CN X supplies the 4th pharyngeal arch?
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Superior laryngeal nerve- Which muscles derive from the 4th pharyngeal arch?
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Pharyngeal constrictors and cricothyroid
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