Crown-Rump Length: Difference between revisions
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===Embryo CRL 11 - 23=== | ===Embryo CRL 11 - 23=== | ||
This graph showing change in CRL during | This graph showing change in CRL during the {{embryonic}} period is based upon the [[Carnegie Collection]] embryos from a later 1957 paper by Streeter.<ref name=Streeter1957>{{Ref-Streeter1957}}</ref> | ||
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[[File:Streeter1957 fig01.jpg|600px]] | [[File:Streeter1957 fig01.jpg|600px]] |
Revision as of 10:47, 9 May 2018
Embryology - 4 May 2024 Expand to Translate |
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Introduction
(CRL) 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.
Modern measurements in clinical medicine are based upon ultrasound as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the GA gestational age.
- Links: embryonic | Carnegie Stage Comparison | Carnegie Institution - Contributions to Embryology | Human Embryo Collections
Ultrasound CRL
Note that clinical GA gestational age is about 2 weeks more than the fertilisation age.
Fertilization and Gestational Age - Crown-Rump Length (ultrasound) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Gestational Age and Crown-Rump Length (measured by ultrasound) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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- Links: CRL-GA Table | FA-GA-CRL
Historic Embryo CRL
Mall (1918)[2] | Streeter (1920) Graph of embryo CRL[3] |
Embryo CRL 11 - 23
This graph showing change in CRL during the embryonic period is based upon the Carnegie Collection embryos from a later 1957 paper by Streeter.[4]
Fetal CRL
Third Trimester CRL
References
- ↑ Westerway SC, Davison A & Cowell S. (2000). Ultrasonic fetal measurements: new Australian standards for the new millennium. Aust N Z J Obstet Gynaecol , 40, 297-302. PMID: 11065037
- ↑ 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.
- ↑ Streeter GL. Developmental Horizons In Human Embryos Description Or Age Groups XIX, XX, XXI, XXII, And XXIII, Being The Fifth Issue Of A Survey Of The Carnegie Collection. (1957) Carnegie Instn. Wash. Publ. 611, Contrib. Embryol., 36: 167-196.
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Cite this page: Hill, M.A. (2024, May 4) 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