Question

Correct sequence of human embryonic development is

• A. Gastrocoel - Blastocoel - Neural Crest - Notochord
• B. Gastrocoel - Blastocoel - Notochord - Neural Crest
• C. Blastocoel - Neural crest - Gastrocoel - Notochord
• D. Blastocoel - Gastrocoel - Neural crest - Notochord

Answer 1

The correct option is D Blastocoel - Gastrocoel - Neural crest - Notochord

Embryogenesis is the process by which the embryo forms and develops.

It occurs in four distinct stages:-

1. Blastocoel- It is a fluid-filled cavity, or space, in the developmental stage known as the blastula, which is called as a blastocyst in mammals.
2. Gastrocoel-The primary gut that forms during gastrulation in the developing zygote is known as the archenteron or the digestive tube.
3. Neural crest - It is a transient embryonic structure in vertebrates that give rise to most of the peripheral nervous system (PNS) and to several non-neural cell types, including smooth muscle cells of the cardiovascular system, pigment cells in the skin, and craniofacial bones, cartilage, and connective tissue
4. Notochord-It is a flexible rodlike structure of mesodermal cells that is the principal longitudinal structural element of chordates and of the early embryo of vertebrates, in both of which it plays an organizational role in nervous system development. In later vertebrate development, it becomes part of the vertebral column

So the correct option is 'Blastocoel - gastrocoel - Neural crest - Notochord'.