Placentation
Placentation
Placentation (/plæsɛnˈteɪʃən/) refers to the formation, type and structure, or arrangement of the placenta in mammals. The term is derived from the Latin word 'placenta' meaning 'flat cake', due to the typically flat, round shape of the organ in humans and some other mammalian species.
Types of Placentation
There are several types of placentation, each characterized by the specific arrangement and attachment of the placenta to the uterus. These include:
- Axile Placentation: The ovules are attached to the central part of the ovary. Common in plants with a high number of seeds.
- Parietal Placentation: The ovules are attached to the wall of the ovary or extend from the ovary base.
- Free Central Placentation: The ovules are attached to a free-standing column in the center of the ovary.
- Basal Placentation: The ovules are attached to the base of the ovary.
- Marginal Placentation: The ovules are attached to the margin of the ovary.
Related Terms
- Placenta: The organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.
- Embryo: An early stage of development of a multicellular organism.
- Uterus: The major female hormone-responsive reproductive sex organ of most mammals, including humans.
- Ovary: An ovary is an organ found in the female reproductive system that produces an ovum.
See Also
External links
- Medical encyclopedia article on Placentation
- Wikipedia's article - Placentation
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