Paper - Growth allometry of the myocardium in human embryos from stages 15 to 23: Difference between revisions
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| [[File:Mark_Hill.jpg|90px|left]] This 1991 paper by Mandarim-de-Lacerda describes {{heart}} development in human embryos. | | [[File:Mark_Hill.jpg|90px|left]] This 1991 paper by Mandarim-de-Lacerda describes {{heart}} development in human embryos. Note only the paper abstract is shown online for educational purposes. | ||
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* '''Allometry''' - refers to the general relationship of body size to shape. | |||
* '''Cavalieri's Principle''' - if, in two solids of equal altitude, the sections made by planes parallel to and at the same distance from their respective bases are always equal, then the volumes of the two solids are equal. | |||
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Mandarim-de-Lacerda CA. | Mandarim-de-Lacerda CA. | ||
Department of Anatomy, State University of Rio de Janeiro, Brazil. | |||
==Abstract== | ==Abstract== | ||
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The relative growth of the myocardium was studied in 27 staged human embryos ([[Carnegie Stage|Carnegie stages]]). | The relative growth of the myocardium was studied in 27 staged human embryos ([[Carnegie Stage|Carnegie stages]]). | ||
The volume of the myocardium was determined for each embryo according to Cavalieri's principle (by using point-counting planimetry to determine the area of the profiles of the myocardium). The volume of the myocardium (variable Y) was correlated to embryonic crown-rump length (variable X in millimeters) and age (in days). The bivariate allometric equation was used as Y = aXb. The scatterplot was discontinuous, presenting two trends during the postsomitic period. The first part was composed of embryos staged from stages 15 to 20, and the second part by embryos staged from stages | The volume of the myocardium was determined for each embryo according to Cavalieri's principle (by using point-counting planimetry to determine the area of the profiles of the myocardium). The volume of the myocardium (variable Y) was correlated to embryonic crown-rump length (variable X in millimeters) and age (in days). The bivariate allometric equation was used as Y = aXb. The scatterplot was discontinuous, presenting two trends during the postsomitic period. The first part was composed of embryos staged from stages 15 to 20, and the second part by embryos staged from stages {{CS21}} to {{CS23}}. | ||
The breakpoint between these different trends was found at the level of stage {{CS20}} (embryo of 22 mm in crown-rump length and age nearly of 52 days). From stages {{CS15}} to {{CS20}}, the growth rate of the myocardium was allometrically negative. On the other hand, from stages {{CS21}} to {{CS23}} this growth rate was moderately allometrically positive. | |||
These differences in growth of the myocardium were analyzed and, at least partially, might be due to the functional circulatory increase in the peripheral vascular bed in correlation to the cardiac hemodynamic demand required at the end of the embryonic period proper. | These differences in growth of the myocardium were analyzed and, at least partially, might be due to the functional circulatory increase in the peripheral vascular bed in correlation to the cardiac hemodynamic demand required at the end of the embryonic period proper. |
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Mandarim-de-Lacerda CA. Growth allometry of the myocardium in human embryos (from stages 15 to 23). (1991) Acta Anat (Basel) 141: 251-256. PMID 1755287
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Growth allometry of the myocardium in human embryos (from stages 15 to 23)
Mandarim-de-Lacerda CA.
Department of Anatomy, State University of Rio de Janeiro, Brazil.
Abstract
The relative growth of the myocardium was studied in 27 staged human embryos (Carnegie stages).
The volume of the myocardium was determined for each embryo according to Cavalieri's principle (by using point-counting planimetry to determine the area of the profiles of the myocardium). The volume of the myocardium (variable Y) was correlated to embryonic crown-rump length (variable X in millimeters) and age (in days). The bivariate allometric equation was used as Y = aXb. The scatterplot was discontinuous, presenting two trends during the postsomitic period. The first part was composed of embryos staged from stages 15 to 20, and the second part by embryos staged from stages 21 to 23.
The breakpoint between these different trends was found at the level of stage 20 (embryo of 22 mm in crown-rump length and age nearly of 52 days). From stages 15 to 20, the growth rate of the myocardium was allometrically negative. On the other hand, from stages 21 to 23 this growth rate was moderately allometrically positive.
These differences in growth of the myocardium were analyzed and, at least partially, might be due to the functional circulatory increase in the peripheral vascular bed in correlation to the cardiac hemodynamic demand required at the end of the embryonic period proper.
Cite this page: Hill, M.A. (2024, April 24) Embryology Paper - Growth allometry of the myocardium in human embryos from stages 15 to 23. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Growth_allometry_of_the_myocardium_in_human_embryos_from_stages_15_to_23
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G