| Term | Definition |
|---|
| cleavage | cell division of a zygote, in which the number of cells increases without any change in the size of the zygote |
| blastocyst | an early stage of embryo development |
| implantation | the attachment of the embryo to the endometrium |
| chorion | the outer extraembryonic structure of a developing embryo that will contribute to the placenta |
| amnion | a fluid filled extraembryonic structure |
| HCG | an embryonic hormon that maintains the corpus luteum |
| amniotic cavity | the fluid filled cavity surrounding the developing embryo |
| extraembryonic coelom | body cavity between the amnion and the chorion |
| yolk sac | a membrenous sac that forms durin embryo development of most vertebraes, in humans it does not contain yolk |
| placenta | the site for the exchange of nutrients and wastes between mother and fetus |
| chorionic villi | vascular prejections of the chorion |
| allantois | extraembryonic structure that contributes to the blood vessels in the placenta |
| umbilical cord | structure that connects the fetus to the placenta |
| first trimester | the period during pregnancy from conception until the end of the third month |
| gastrulation | process by which a gastrula is formed |
| gastrula | stage of embryonic development in which the embryo is composed of three layers, ectoderm, mesoderm, endoderm |
| ectoderm | the outer layer of cells in the embryo |
| mesoderm | the middle layer of cells in the embryo |
| endoderm | the inner layer of cells in the embryo |
| second trimester | the period during pregannt from the fourth month to the end of the sixth month |
| third trimester | the period during pregnancy from the seventh month to birth |
| teratogen | any medication, chemical, infectious desease, or enviromental agent that might interfere with the normal development of a fetus or embryo |
| parturition | the act of giving birth, labour |
| relaxin | a hormone produced by the placenta prior to labour, cause the ligaments within the pelvis to loosen |
| oxytocin | a hormone from the pituitary gland, causes strong uterine contractions |
| prolactin | a hormone produced by the petuitary gland and associated with milk production |
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