Blastocyst- Stages, Significance

The preimplantation period of human embryo development is remarkable and characterized by successive changes in terms of genetic control, physiology, and morphology of the embryo. Blastocyst (Greek, blastos= sprout + cystos = cavity) is a distinctive stage of mammalian embryo development, characterized by a hollow cellular mass that forms in early development. It is an embryo that has developed for … Read more Blastocyst- Stages, Significance

Human Embryo Transfer

Human Embryo Transfer

‘Embryo transfer’ refers to the transplantation of a mammalian preimplantation embryo into the reproductive tract of a recipient female so that it may implant and continue to develop to birth. Mammalian embryos of many species can develop in vitro from fertilization to the blastocyst stage (approximately 100 cells), but at this point, they must implant in the … Read more Human Embryo Transfer

Human Embryogenesis

Human Embryogenesis Human embryogenesis refers to the development and formation of the human embryo. It encompasses the first eight weeks of development after fertilization, in which a single cell formed at fertilization turns into an organism with a multi-level body plan. It is characterized by the process of cell division and cellular differentiation that occurs during the early stages … Read more Human Embryogenesis

Comparative Embryology- Principle, Significance

Comparative embryology is the branch of embryology that compares and contrasts embryos of different species, showing how all animals are related. Put simply, comparative embryology is the comparison of embryo development across species. All vertebrate embryos follow a common developmental path due to their common ancestry. They pass from single cells to multi-celled zygotes, clumps of cells called morulas, and hollow … Read more Comparative Embryology- Principle, Significance

The Prenatal Developmental Period

The human body, like that of most animals, develops from a single cell produced by the union of a male and a female gamete (or sex cell).  Cell division, cell migration, programmed cell death (apoptosis), differentiation, growth, and cell rearrangement transform the fertilized oocyte, a highly specialized, totipotent cell, a zygote, into a multicellular human being. It is customary to … Read more The Prenatal Developmental Period

Introduction to Embryology

Introduction to Embryology

Human development is a continuous process that begins when an oocyte (ovum) from a female is fertilized by a sperm (spermatozoon) from a male. Cell division, cell migration, programmed cell death (apoptosis), differentiation, growth, and cell rearrangement transform the fertilized oocyte, a highly specialized, totipotent cell, a zygote, into a multicellular human being. Most changes … Read more Introduction to Embryology