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Human Development Chapter 2

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Questions and Answers

What contributes presumptive neuroblasts to ganglionic primordia in embryonic facial development?

Mesenchyme cells
Placodes adjacent to ganglionic primordia (correct)
Neural tube cells
Epidermal cells

Which section plane passes through the trigeminal ganglion primordium?

Section plane F
Section plane D
Section plane E (correct)
Section plane C

What do the initial ganglionic primordia result from in embryonic facial development?

Migrating neuroblasts from placodes
Cranial nerves VII, IX, and X development
Neural tube cells proliferation
Cords of neural crest cells (correct)

What alters the nature of the first two visceral arches in embryonic facial development?

Facial prominences from other visceral arches (C) Signup and view all the answers

Which structures are formed by the growth and fusion of upper facial prominences in embryonic facial development?

Primary and secondary palates (B) Signup and view all the answers

What are ectodermal thickenings called that form adjacent to distal ends of ganglionic primordia?

Placodes (D) Signup and view all the answers

Which cells migrate into previously crest cell ganglionic primordia during embryonic facial development?

Placodal neurons (B) Signup and view all the answers

What do the facial prominences initiate in embryonic facial development?

"Outgrowths or swellings" (A) Signup and view all the answers

What is illustrated in figures E and F regarding embryonic facial development?

Distribution of crest and placodal neurons (D) Signup and view all the answers

What contributes to the formation of trigeminal (V) nerve placodes in embryonic facial development?

Ectodermal thickenings adjacent to ganglionic primordia (C) Signup and view all the answers