Foetal – Human Foetus (Fetus) Development Medical Illustrations
Foetal (Fetal) development in human’s is the process from fertilisation where fusion of the male and female gametes has occurred. This is the fusion of female gametes called an ova or egg and male gametes called sperm. Gametes are specialised haploid cells and each cell carries only one copy of each chromosome. Therefore, fertilisation has completed when the nuclei of the ova or egg and sperm have combined, creating a single cell that is then capable of development by dividing into further cells.
When the sperm and egg meet fertilisation occurs inside one of the fallopian tubes. The journey of the now fertilised egg continues its journey and carries along the fallopian tube for about four days. During this time the single cell has been dividing until it finally a ball of cells that surround a fluid filled inner cell called a blastocyst. The blastocyst inner cell mass is what subsequently forms the embryo.
The blastocyst enters the uterus via the fallopian tube and implantation into the uterine endometrium occurs. The blastocyst ‘buries’ itself in the uterine endometrium and this initial phase of the implantation process is called “adplantation”. Subsequent developments are the forming a placenta so the embryo can gain nutrients to grow and the placenta is what allows for the maternal support during foetal development.