Question

Embryonic urinary bladder is-

• A. Amnion
• B. Chorion
• C. Allantois
• D. All

Answer 1

The correct option is C Allantois

The amnion is a membranous sac which surrounds and protects the embryo. It is the first of the three cavities in the embryo.

The chorion is a bilayered membrane, consisting of an outer layer of extraembryonic ectoderm (trophectoderm) and an inner epiblast-derived extraembryonic mesoderm.

The allantois, which serves as a reservoir for fetal urine in other mammals, becomes attached to the urinary bladder. The proximal part of the allantois (called the urachus) is continuous with the embryonic urinary bladder.

Thus, the correct answer is 'Allantois.'