Embryoembryo
The fertilized egg is called a blastocyst during implantation. The blastocyst is a multicellular structure that forms from the fertilized egg as it develops and prepares for implantation in the uterine lining.
The fertilized egg implants and develops in the uterus.
The first step in the development of an embryo from a fertilized egg is cleavage, where the cell begins to divide repeatedly without increasing in size. This process results in a multicellular structure known as a morula.
incubator or brooder
It is called a morula, and consists of the first 16 cells from the division of the zygote (fertilized egg). The individual undifferentiated cells are known as blastomeres, and form a hollow structure called a blastocyst. Once differentiation of cells occurs, the structure is simply called an embryo, and later a fetus.
When a sperm unites with an egg, the fertilized egg is called a zygote. This is the first stage of development in a new organism with a complete set of chromosomes from both the sperm and the egg.
The uterus
It is necessary for an egg to be fertilized so the egg can hatch.
Blastocyst
It never 'receives' blood. It makes its own. In humans the first red blood cells show up at the end if the first month.
A fertilized egg cell is when a sperm enters an egg. The result is a fertilized egg cell, or a zygote.