Question 1

________ Derived from paraxial mesoderm

Accepted Answer

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Question 2

________ Primitive pit

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Question 3

________ Derived from notochordal process

Accepted Answer

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Question 4

________ Appears on extraembryonic membranes

Accepted Answer

The blood islands first appear on the walls of the umbilical vesicle,allantois,and connecting stalk.These extraembryonic membranes are derived from the zygote,but they are not part of the embryo.Blood islands form in the embryo about 2 days after they appear on the umbilical vesicle.

Question 5

________ Gives rise to the brain and spinal cord

Accepted Answer

The neural plate gives rise to the brain and spinal cord through a process called neurulation. The other choices, such as allantois, primitive streak, notochord and blood island, do not directly contribute to the development of the central nervous system.

Question 6

________ Umbilical artery

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Question 7

________ Embryonic ectoderm

Accepted Answer

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Question 8

________ Notochordal process

Accepted Answer

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Question 9

________ Gives rise to an adult body cavity

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Question 10

________ Neural groove

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Question 11

________ Wall of amniotic sac

Accepted Answer

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Question 12

________ Source of mesenchyme

Accepted Answer

Mesenchyme arises from the mesoderm layer of the embryo which is formed during gastrulation. The primitive streak is the site of gastrulation and the formation of the three germ layers, including the mesoderm. Therefore, the primitive streak is the source of mesenchyme.

Question 13

________ Splanchnopleure

Accepted Answer

The splanchnopleure refers to the embryonic layer derived from the endoderm and mesoderm. In the given image, layer D represents the splanchnopleure as it is located below the gut tube and is derived from both endoderm and mesoderm. Layers A and C represent the somatopleure, which is derived from mesoderm and ectoderm. Layer B is the mesoderm layer that separates the two. Layer E is not labeled, but it would most likely be the endoderm layer.

Question 14

________ Derived from primitive streak

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Question 15

________ Gives rise to most of the embryonic mesoderm

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Question 16

________ Site of the prechordal plate

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Question 17

________ Forms the basis of the axial skeleton

Accepted Answer

The notochord is a cylindrical rod-like structure that forms along the longitudinal axis of the developing embryo and serves as the basis for the axial skeleton in vertebrates. The allantois is a sac-like structure that forms during embryonic development and plays a role in waste elimination and gas exchange. The primitive streak is the first visible sign of gastrulation in the developing embryo, which marks the beginning of cell differentiation. Blood islands are clusters of cells that form blood vessels and blood cells. The neural plate gives rise to the nervous system.

Question 18

________ Diverticulum of umbilical vesicle (yolk sac)

Accepted Answer

The yolk sac gives rise to the allantois, which is a diverticulum of the umbilical vesicle. The primitive streak is involved in the formation of the three germ layers during gastrulation, the notochord is a structure that induces the formation of the neural tube, the blood island is a site of blood cell formation in the yolk sac, and the neural plate is the precursor to the neural tube.

Question 19

________ Aggregation of angioblasts

Accepted Answer

The aggregation of angioblasts occurs in structures called blood islands, which are precursors to blood vessels. The other structures listed are involved in different aspects of embryonic development.

Question 20

________ Fusing to form neural tube

Accepted Answer

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Quiz 1: Gametogenesis and Fertilization