Trilaminar Embryo

Question 1

What is the primary inducer in the early embryo?

Answer 1

The notochord

Question 2

What is the allantois and what does it become?

Answer 2

An outpouching of the yolk sac in the caudal wall. It helps develop the urinary bladder

Question 3

What overlies the notochord and what does the notochord induce this to become?

Answer 3

Ectoderm. It is induced to become the neural plate, then the neural tube, then eventually the CNS

Question 4

Name the three sections of intraembryonic mesoderm and what each becomes

Answer 4

Paraxial (Somites), Intermediate (Urogenital), Lateral Plate (Limbs and Body Wall)

Question 5

What do the somites develop into?

Answer 5

Vertebrae, Muscles of back, Skin

Question 6

What does the intraembryonic coelom develop into?

Answer 6

Peritoneal cavity, pleural cavities, pericardial cavity