Question

describe the events in early embryonic development

Answer 1

• Embryonic development is the sequence of events that gradually changes a zygote into a functional organism.
• Embryonic development starts with fusion of sperm and egg resulting a single celled zygote.
• Egg is released by ovary and sperm is released by testis.
• Sperm undergo capacitation in female genital syestem to undergo fast movement.
• fertilization occurs at ampulla of uterus.
• This zygote undergo a special type of mitotic division called cleavage and cellular differentiation leading to multicellular embryo.
• After 7th cleavage has produced 128 cells called blastula, it is characterized by inner cell mass and surrounding blastula.
• Then after , there wll be formation of 3 germ layers , ectoderm ,endoderm and mesoderm.
• The embryo with triploblastic germ layer is called gastrula, which is now implanted on uterus.
• Then after , formation of neural folds, three brain vesicles.and notochord is developed.
• somitogenesis occur , whuch is the formation of somites , in which these somites are differentiate into skeletal muscles, dermis, and vertebrae.
• At last organogenesis occurs from different germ layers.