Question

The development of the eye in vertebrate embryology is studied under
A. Notogenesis
B. Neurogenesis
C. Myogenesis
D. Organogenesis

Answer 1

Hint: In the human embryo the formation of eyes begins at approximately three weeks and its development goes on till the tenth week. The cells from both the mesodermal and the ectodermal tissue take part in the formation of eyes.

Complete step- by- step answer:
- Notogenesis: It is the development of notochord. The notochord is a rod- like structure which is flexible and is present in the embryos of all the chordates. In the later stages of vertebrates, the notochord develops into the spinal column.
- Neurogenesis: It is the process by which the neural stem cells give rise to nervous stem cells and the neurons. It is the most active process during the development of the embryos and is also accountable for producing all types of neurons in the organisms.
- Myogenesis: It is the process of development of vascular tissues during embryonic development. The formation of muscles fibres mostly takes place by the fusion of myoblasts cells with multinucleated fibres known as myotubes.
- Organogenesis: It is the process in embryogenesis in which the formation of organs takes place. The process starts at the end of gastrulation and goes on until the childbirth. The organs are produced by the three germ layers i.e. the endoderm, the mesoderm and the ectoderm. The eyes are the organs that are formed by the ectoderm layers and it also forms the lens, corneal epithelium and eyelids.
Hence, the correct answer is D.

Note: The eyes are obtained from the neuroepithelium. Neuroepithelium also helps in the creation of retina, ciliary body, iris and optic nerves.