Ovum refers to secondary oocyte stage of oogenesis, where the second maturation division is yet to occur. In this condition the matured ovum is released from ovary and enters into uterus in mammals for fertilization. In mammals including man the ovum is discharged from the Graafian follicle (ovulation) with one polar body. Each ovum is a rounded and non-motile structure. [...]
The outer layer of cells of morula absorbs fluid which collects in a cavity formed within the cell mass. This cavity is called as blastocoel or blastocyst cavity. The outer layer of Hat cells are called as trophoblast. The embryo is now called as blastocyst or blastula. It is composed of an outer layer of trophoblast and inner cell mass. [...]
Definition: The process of union of a haploid male gamete or sperm with a haploid female gamete or ovum to form a diploid cell, the zygote, is called fertilization. Site of Fertilization: In man fertilization is internal (external in case of frog) as in other mammals. It takes place usually in the ampulla of the fallopian tube. Process of Fertilization: [...]