Yolk sac
Yolk Sac
The Yolk Sac (pronounced: yōk sak) is an important structure in the early development of animals, including humans. It is derived from the Greek words 'yolk' meaning 'yellow' and 'sac' meaning 'bag'.
Etymology
The term 'Yolk Sac' is derived from the Old English 'geolca' meaning 'yolk' and the Latin 'saccus' meaning 'sac' or 'bag'. The term was first used in the late 19th century to describe the structure in the eggs of birds and reptiles that stores food for the developing embryo.
Function
The Yolk Sac serves several vital functions during the early stages of development. It provides nutrients to the developing embryo before the placenta is fully formed. It also produces blood cells and helps to form the gastrointestinal tract.
Related Terms
- Embryo: The early stage of development in mammals, birds, and reptiles, before it becomes a fetus.
- Placenta: An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the developing baby.
- Gastrointestinal Tract: The system of organs responsible for consuming and digesting foodstuffs, absorbing nutrients, and expelling waste.
See Also
External links
- Medical encyclopedia article on Yolk sac
- Wikipedia's article - Yolk sac
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