Chapter 22

1. These genes influence the segmentation of human embryos.
6. In this stage of embryonic development, the cells migrate to create three distinct layers.
8. The division of an organism into repeating units, specifically on the anterior/posterior axis.
10. Which embryonic germ layer gives rise to the lining of the organs?
11. The transient section of the dorsal neural tube that gives rise to peripheral sensory neurons and glia.
14. The sharp bend in the neural tube that balloons out into the prosencephalon.
15. These cells form bicycle-like spokes to aid in neural migration.
16. This section of the developing embryo gives rise to the midbrain.
18. Which embryonic germ layer gives rise to the neural tube?
19. This section of the developing embryo gives rise to the cerebrum.
20. These genes influence the segmentation of Drosophila.

2. These formations will later become eyes.
3. This section of the developing embryo gives rise to the thalamus and hypothalamus.
4. In this stage of embryonic development, a folding process creates a tube that is crucial in future development of the brain.
5. Which embryonic germ layer gives rise to the organs?
7. Cells These cells may become any other type of cell, depending on input from their surroundings.
9. This section of the developing embryo gives rise to the medulla.
12. The transient section of the coral neural tube that gives rise to interneurons in the spine and hindbrain.
13. This section of the developing embryo gives rise to the pons and cerebellum.
17. What determines whether cells in the dorsal ectoderm give rise to epidermal or neural cells?