Question

Choose the right one.
A. Mesoderm- skeleton
B. Mesoderm- brain
C. Ectoderm- liver
D. Endoderm- epidermis

Answer 1

Hint: The important components of somitogenesis (somite formation) are periodicity, epithelialization, specification, and differentiation. The primary somites appear within the anterior portion of the trunk, and new somites “bud off” from the rostral end of the paraxial mesoderm at regular intervals.

Complete answer:
The inner cell mass of the blastocyst after the implantation differentiates into an outer ectoderm, and the middle mesoderm and inner endoderm. These layers then become tissues and organs of these embryos. Endoderm gives rise to certain types of organs including the colon, stomach, intestines, liver, lungs and pancreas.
Mesoderm gives rise to the heart, kidneys, gonads, genital ducts, cartilage, muscles, blood cells, and other types of structures. Ectoderm forms the outer linings of the epithelium, brain, medulla spinalis, nerves, ears, nails and hair. Mesoderm forms the muscles which are an integral part of the skeleton.

So the correct answer is option A.

Mesoderm is liable for the assembly of various structures and organs within the developing embryo including the cardiovascular system, muscular system, skeleton system also as systema lymphatica.
The mesoderm is one among the three germinal layers that appear within the third week of the embryonic development. It's formed through a process called gastrulation. There are three important components, the paraxial mesoderm, the intermediate mesoderm and therefore the lateral plate mesoderm.

Note:
The mesoderm gives rise to that the skeletal muscles, smooth muscle, blood vessels, bone, cartilage, joints, animal tissue, endocrine glands, kidney cortex, cardiac muscle, urogenital organ, uterus, Fallopian tube, testicles and the blood cells from the medulla spinalis and the lymphoid tissue.