What are the steps of fertilization and embryo development?

The fertilized egg (zygote) begins to develop into a hollow ball of cells called the blastocyst. The blastocyst implants in the wall of uterus. The amniotic sac begins to form. The area that will become the brain and spinal cord (neural tube) begins to develop.

What is fertilization development?

A fertilized egg, or zygote, takes about five days to reach the uterus from the uterine tube. As it moves, the zygote divides and develops into a blastocyst, with an inner mass of cells and a protective outer ring. The blastocyst attaches to the wall of the uterus and gradually implants itself into the uterine lining.

What is the difference between fertilization and embryo?

An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg. A zygote is a single-celled organism resulting from a fertilized egg.

What are twins?

Identical twins occur when a single fertilized egg splits into two. Identical twins look almost exactly alike and share the exact same genes. Most identical twins happen by chance. Fraternal twins occur when two, separate eggs are fertilized by two, separate sperm.

What causes twinning in the first week of development?

Twinning can be due to two separate fertilization events (dizygotic twins) or as an abnormality of a single fertilization (monozygotic twins) event during the early weeks of development. Dizygotic twins (fraternal, non-identical) arise from separate fertilization events involving two separate oocyte (egg, ova) and spermatozoa (sperm).

What is the scientific name for the process of embryo development?

Embryo Development Embryo development in humans where the journey of our life begins with a single cell which later divides itself into a mass of many cells together. The scientific name that has been given for the process of embryo development is called embryogenesis. This is nothing but the process which follows fertilization.

What happens in Week 1 and Week 2 of embryology?

This lecture will discuss the first two weeks of human embryogenesis and describe the cleavage stages, blastocyst formation and hatching, and the generation of the bilaminar embryo. There will also be an introduction to the uterine changes at implantation, that will be covered in detail in the placentation lecture. Objectives

How does fertilization occur in an early zygote?

Early Human Zygote. Fertilization is the fusion of haploid gametes, egg and sperm, to form the diploid zygote. Note though there can be subtle differences in the fertilization process which occurs naturally within the body or through reproductive technologies outside the body, the overall product in both cases is a diplod zygote.

https://www.youtube.com/watch?v=hz3R9hAAxTg