Crown-rump length
Crown-rump length
Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump). It is typically determined from ultrasound imagery and can be used to estimate gestational age.
Pronunciation
Crown-rump length: /ˈkraʊn rʌmp ˈlɛŋkθ/
Etymology
The term "crown-rump length" is derived from the two anatomical points used for the measurement. The "crown" refers to the top of the embryo or fetus's head, while the "rump" refers to the bottom of the buttocks.
Related Terms
- Gestational age: The age of an embryo or fetus from the first day of the woman's last menstrual period.
- Ultrasound: A medical imaging technique used to visualize internal body structures.
- Embryo: An early stage of development in multicellular organisms.
- Fetus: A stage in mammalian embryonic development after the embryonic stage and before birth.
- Anatomical terms of location: Standard terms used to unambiguously describe the anatomy of animals, including humans.
See Also
External links
- Medical encyclopedia article on Crown-rump length
- Wikipedia's article - Crown-rump length
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