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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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SECOND PHARYNGEAL ARCH CYST:

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

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

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SECOND ARCH FISTULAE: Why?

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THYROGLOSSAL DUCT CYST. How does this condition develop?

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CT SCAN OF THYROGLOSSAL DUCT CYST

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SUPRA LINGUAL THYROID: How would you treat this abnormality?

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SUBLINGUAL THYROID: How would you treat this?

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

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

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FIRST ARCH SYNDROME (TREACHER-COLLINS SYNDROME): Identify the characteristics of First Arch

Syndrome. How does this condition arise embryologically?

PHARYNGEAL ARCHES 13FIRST ARCH SYNDROME (TREACHER-COLLINS SYNDROME): Identify the characteristics of First Arch

Syndrome. How does this condition arise embryologically?

PHARYNGEAL ARCHES 14FIRST ARCH SYNDROME (TREACHER-COLLINS SYNDROME): Identify the characteristics of First Arch

Syndrome. How does this condition arise embryologically?

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

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