Crown-Rump Length: Difference between revisions
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(CRL, greatest length, GL) A measurement used in embryology to more accurately stage the early embryo, also historically called the "greatest length" (GL). Measured from the curvature at the top (crown) to the curvature at the bottom (rump) of the "C-shaped" early embryo. Used in clinical [[ultrasound]] as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the gestational age. | (CRL, greatest length, GL) A measurement used in embryology to more accurately stage the early embryo, also historically called the "greatest length" (GL). Measured from the curvature at the top (crown) to the curvature at the bottom (rump) of the "C-shaped" early embryo. Used in clinical [[ultrasound]] as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the gestational age. | ||
==Embryo CRL== | |||
{| | |||
| [[File:Mall1918-fig01.jpg|400px]] | |||
| [[File:Streeter1920chart1.jpg|400px]] | |||
|- | |||
| Mall (1918)<ref>{{Ref-Mall1918}}</ref> | |||
| Streeter (1920) Graph of embryo CRL<ref>{{Ref-Streeter1920}}</ref> | |||
|} | |||
==Fetal CRL== | |||
[[File:Keibel Mall 144.jpg|thumb|Human Embryo No. 131 90 mm CRL]] | |||
[[File:Fetal length change.jpg|600px]] | |||
==Third Trimester CRL== | |||
[[File:Third trimester Crown-Rump Length graph.jpg|600px]] | |||
==References== | ==References== |
Revision as of 11:34, 21 July 2016
Embryology - 17 Apr 2024 Expand to Translate |
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Introduction
(CRL, greatest length, GL) A measurement used in embryology to more accurately stage the early embryo, also historically called the "greatest length" (GL). Measured from the curvature at the top (crown) to the curvature at the bottom (rump) of the "C-shaped" early embryo. Used in clinical ultrasound as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the gestational age.
Embryo CRL
Mall (1918)[1] | Streeter (1920) Graph of embryo CRL[2] |
Fetal CRL
Third Trimester CRL
References
- ↑ Mall FP. On the age of human embryos. (1918) Amer. J Anat. 23: 397-422.
- ↑ Streeter GL. Weight, sitting height, head size, foot length, and menstrual age of the human embryo. (1920) Contrib. Embryol., Carnegie Inst. Wash. Publ. , : 143-170.
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Cite this page: Hill, M.A. (2024, April 17) Embryology Crown-Rump Length. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Crown-Rump_Length
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G