Question

The ‘Cells of Rauber’ are
A. Inner cell mass of blastocoel.
B. Secretory cells of endometrium.
C. Trophoblast cells in contact with the uterine wall.
D. Trophoblast cells in contact with inner cell mass of blastocyst.

Answer 1

Hint: A layer of cells that help a developing embryo to attack the wall of the uterus is called trophoblast. It protects the embryo and forms a part of the placenta. Placenta acts as a connection or link between mother and developing embryo.

Complete Answer:
‘Cells of Rauber’ are trophoblast cells that are in contact with the inner mass of blastocyst. They are in contact with embryos and when the developing embryo reaches the uterine cavity after five to six days of fertilization, it is called blastocyst. A blastocyst is usually made up of a hundred cells.

The blastocyst is a structure formed in the stages of easy development of mammals. If it possesses an inner mass and cell which forms an embryo. The outer layer of blastocyst consists of cells that are known as trophoblast. Blastocyst is a more complex structure than the cleaved embays.

The inner cell mass looks like a small knob at one pole and gives rice to an embryo called an embryonal knob. The trophoblast cells in contact with embryonal knots are called ‘Cells and Rauber’.

Therefore, from the above explanation the correct option is (A) Inner cell mass of blastocoel.

Note: The cells of Rauber is generally found in early embryonic embryo and its functions are as follows,
- It gives rise to an extraembryonic membrane - chorion and amnion.
- Chorion and amnion are needed for the protection and nourishment of the embryo.