Early Development & Implantation

1.Describe the formation, fate and embryological significance of primitive streak

1.Divisions and derivatives of intraembryonic mesoderm

2.Describe the formation, subdivisions and fate of intra embryonic mesoderm

3.Describe the process of implantation and common abnormal sites of implantation

4.Formation and fate of notochord

5.Implantation

6.Process of implantation and its clinical aspects

7.Notochord

8.Intra embryonic mesoderm – formation, parts and derivatives

1.Somites

2.Implantation

3.Blastocyst

4.Yolk sac

5.Yolk sac and its fate in humans

1.Parts of blastocyst

2.Derivatives of intraembryonic coelom

3.Somites

1.Assertion: The notochord forms the neural tube

• Reason: The nucleus pulposus of intervertebral disc is a remnant of notochord
• a) Both A and R are true and R is the reason for A
• b) Both A and R are true and R is not the reason for A
• c) A is correct but R is incorrect
• d) A is incorrect but R is correct

2.The intra embryonic coelom forms the following cavities

• 1) Pleural
• 2) Peritoneal
• 3) Pericardial
• 4) Oral
• a) 1, 2, 3
• b) 2, 3
• c) 2, 4
• d) 2, 3, 4

3.All three germ layers are present in

• a) Urachus
• b) Tympanic membrane
• c) Cornea
• d) Heart

4.At the caudal end of the primitive streak, ectoderm and endoderm meet at the

• a) Coelom
• b) Cloacal membrane
• c) Neural groove
• d) Notochord