Gastrulation

Question 1

profound well-ordered rearrangements of the cell in the embryo

Answer 1

Gastrulation

Question 2

Major morphogenetic movements in Gastrulation

Answer 2

• Invagination
• Involution
• Epiboly
• Ingression
• Delamination (Poly-ingression)

Question 3

The outward folding of a cell sheet

Answer 3

Evagination

Question 4

Cells move in an amoeba-like fashion, often seen in some invertebrates

Answer 4

Amoeboid motion

Question 5

Two main strategies to handle Gastrulation

Answer 5

1. Spherical Context
2. Yolk-rich Context

Question 6

Gastrulation occurs in a spherical or nearly symmetrical embryo

Answer 6

Spherical context

Question 7

mechanisms of Spherical context

Answer 7

• Invagination
• Inner cavity formation
• Opening to the Archenteron

Question 8

Outcome of Spherical context

Answer 8

• Reorganization of three germ layers (Ecto, Endo, Meso)

Question 9

Gastrulation is adapted due to the large amount of yolk.

Answer 9

Yolk-Rich Context

Question 10

Mechanisms in Yolk-rich context?

Answer 10

Formation of primitive streak (not blastopore), migration of cells inward

Question 11

Outcome of Yolk-rich context

Answer 11

Germ layers formation through, epiboly, ingression, and migration

Question 12

are a specific group o cells that arise from the vegetal pole of the blastula

• The focus of gastrulation on the movement and arrangement

Answer 12

Primary Mesenchymal cells (PMCs)

Question 13

four destined cell tyles in sea urchin?

Answer 13

1. Pigment cells
2. Blastocoelar cells
3. Two coelomic pouches which protrude from the tip of archenteron
4. The circumesophageal musculature

Question 14

What influences Xenopus gastrulation?

Answer 14

• Yolk distribution and Cortical rotation