1. This embryonic tissue is directly involved in the process of implantation, fa
ID: 216878 • Letter: 1
Question
1. This embryonic tissue is directly involved in the process of implantation, facilitating the embedding of the human conceptus into the uterine lining.
a. Describe the structure and function of this tissue and all structures derived from it
b. Some extraembryonic membranes are derived from the Inner Cell Mass. Describe the structure and function of each
2. Describe blood flow in the fetus and the role of the following structures in fetal circulation
Ductus Venosus
Ductus Arteriosus
Foramen Ovale
Explanation / Answer
Ans-1-A the embryonic tissue is made up of three layers
Ectoderm- it is the outer layer and it develop into skin and nervous system.
Mesoderm- it is the middle layer and it develop into cartilage and bones.
Endoderm- it is the innermost layer and develop into the internal organs like kidney, liver and heart etc.
Ans-1-B the extraembryonic membranes are not directly associated in formation of the organs but these are responsible for the nutrition, waste management and gas exchange of the foetus with the mother. These link with the placenta and perform the task.
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