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PHARYNGEAL ARCHES 01

26 DAY EMBRYO: This is a frontal section through the pharyngeal region of a 26 day embryo. Locate and identify the following: DIENCEPHALON, OPTIC STALK, OPTIC CUP, PHARYNGEAL ARCHES, ECTODERMAL COVERING OF ARCH, ENDODERMAL LINING OF ARCH, MESODERMAL CORE OF ARCH, AORTIC ARCHES, HEAD MESENCHYME and SPINAL CORD.

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PHARYNGEAL ARCHES 02

SECOND PHARYNGEAL ARCH CYST:

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PHARYNGEAL ARCHES 03

CT SCAN OF SECOND ARCH CYST: How does such a cyst develop?

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PHARYNGEAL ARCHES 04

SECOND ARCH SINUS OR FISTULAE: How would you differentiate between a sinus and a fistulae?

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PHARYNGEAL ARCHES 05

SECOND ARCH FISTULAE: Why?

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PHARYNGEAL ARCHES 06

THYROGLOSSAL DUCT CYST. How does this condition develop?

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PHARYNGEAL ARCHES 07

CT SCAN OF THYROGLOSSAL DUCT CYST

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PHARYNGEAL ARCHES 08

SUPRA LINGUAL THYROID: How would you treat this abnormality?

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PHARYNGEAL ARCHES 09

SUBLINGUAL THYROID: How would you treat this?

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PHARYNGEAL ARCHES 10

HYPOTHYROIDISM: (also know as cretinism) What are the identifying characteristics of this condition?

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PHARYNGEAL ARCHES 11

HYPERTHYROIDISM: How might this condition arise. What are the identifying characteristics?

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PHARYNGEAL ARCHES 12

FIRST ARCH SYNDROME (TREACHER-COLLINS SYNDROME): Identify the characteristics of First Arch Syndrome. How does this condition arise embryologically?

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PHARYNGEAL ARCHES 13

FIRST ARCH SYNDROME (TREACHER-COLLINS SYNDROME): Identify the characteristics of First Arch Syndrome. How does this condition arise embryologically?

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PHARYNGEAL ARCHES 14

FIRST ARCH SYNDROME (TREACHER-COLLINS SYNDROME): Identify the characteristics of First Arch Syndrome. How does this condition arise embryologically?

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PHARYNGEAL ARCHES 15

MICROGNATHIA (PIERRE ROBIN SYNDROME): With which arch is this abnormality associated?

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PHARYNGEAL ARCHES 16

FIRST PHARYNGEAL ARCH CYST: How do you know this is a first arch cyst?

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