Changes

== Fertilisation, Implantation and Early Embryonic Development ==

== Fertilisation, Implantation and Early Embryonic Development ==

After mating has occured, sperm must [[Copulation -Sperm in the Female Tract - Anatomy & Physiology|travel]] along the female reproductive tract towards the uterus in order to [[Fertilisation, Implantation and Early Embryonic Development -Fertilisation- Anatomy & Physiology|fertilise]] the oocyte. A single spermatazoon penetrates the oocyte and the male and female pronuclei fuse to form an ootid which divides repeatedly to form the [[Fertilisation, Implantation and Early Embryonic Development -Embryonic Development of the Blastocyst- Anatomy & Physiology|blastocyst]].

After mating has occured, sperm must [[Copulation -Sperm in the Female Tract - Anatomy & Physiology|travel]] along the female reproductive tract towards the uterus in order to [[Fertilisation, Implantation and Early Embryonic Development -Fertilisation- Anatomy & Physiology|fertilise]] the oocyte. A single spermatazoon penetrates the oocyte and the male and female pronuclei fuse to form an ootid which divides repeatedly to form the [[Fertilisation, Implantation and Early Embryonic Development -Embryonic Development of the Blastocyst- Anatomy & Physiology|blastocyst]]. The blastocyst continues to divide and grow until the outer layer, the zona pellucida ruptures and the blastocyst 'hatches' and becomes free floating within the uterus. The placental membranes then attach to the uterine endometrium in a process known as [[Fertilisation, Implantation and Early Embryonic Development -Implantation- Anatomy & Physiology|implantation]].