Limb development — Flashcards

Flashcard 1: Developmental Dysplasia of the Hip results from abnormal _____ development in newborns

Answer: acetabulum

Flashcard 2: Which gene of embryogenesis is involved in segmental organization of the embryo in a craniocaudal direction? _____

Answer: Homeobox (Hox) genes

Flashcard 3: Which gene of embryogenesis is responsible for proper organization of the limb along the dorsal-ventral axis?

Answer: Wnt-7a

Flashcard 4: What is the embryonic origin of the muscle, bone, and connective tissue? _____

Answer: Mesoderm

Flashcard 5: In which week of embryogenesis do the upper/lower limb buds form? _____

Answer: Week 4 (4 weeks = 4 limbs)

Flashcard 6: mastoid air cells

Answer: 1st pouch

Flashcard 7: Endoderm lined structures of the ear (1st pharyngeal pouch)

Answer: 1st pouch

Flashcard 8: Embryological origin of the thymus

Answer: 3rd pharyngeal pouch (ventral wing)

Extra: The 3rd pharyngeal pouch gives rise to the Thymus (ventral wing) and the Inferior Parathyroid glands (dorsal wing). Compare with the 4th pharyngeal pouch, which gives rise to the Superior Parathyroid glands.

Flashcard 9: inferior parathyroids

Answer: 3rd pouch

Flashcard 10: superior parathyroids

Answer: 4th pouch