Origin of the Ultimobranchial Body and Its Colonizing Cells in Human Embryos

1989 ◽  
Vol 136 (4) ◽  
pp. 325-330 ◽  
Author(s):  
J.A. Mérida-Velasco ◽  
J.D. García-García ◽  
J. Espín-Ferra ◽  
J. Linares
Keyword(s):  
Human Embryos ◽  
Ultimobranchial Body

scholarly journals Is the ultimobranchial body a reality or myth: a study using serial sections of human embryos

2016 ◽  
Vol 93 (2) ◽  
pp. 29-40
Author(s):  
Yohei HONKURA ◽  
Masahito YAMAMOTO ◽  
Toshihito YOSHIMOTO ◽  
Jose Francisco RODRIGUEZ-VAZQUEZ ◽  
Gen MURAKAMI ◽  
...  
Keyword(s):  
Human Embryos ◽  
Serial Sections ◽  
Ultimobranchial Body

Cleavage of Human Embryos: Options and Diversity

Acta Naturae ◽  
2016 ◽  
Vol 8 (3) ◽  
pp. 88-96
Author(s):  
Yu. K. Doronin ◽  
I. V. Senechkin ◽  
L. V. Hilkevich ◽  
M. A. Kurcer
Keyword(s):  
Time Lapse ◽  
Reproductive Technologies ◽  
Human Embryos ◽  
Imaging Data ◽  
Noninvasive Methods ◽  
Topographic Features ◽  
Time Parameters ◽  
Embryo Cleavage ◽  
Time Lapse Imaging ◽  
Developmental Dynamics

In order to estimate the diversity of embryo cleavage relatives to embryo progress (blastocyst formation), time-lapse imaging data of preimplantation human embryo development were used. This retrospective study is focused on the topographic features and time parameters of the cleavages, with particular emphasis on the lengths of cleavage cycles and the genealogy of blastomeres in 2- to 8-cell human embryos. We have found that all 4-cell human embryos have four developmental variants that are based on the sequence of appearance and orientation of cleavage planes during embryo cleavage from 2 to 4 blastomeres. Each variant of cleavage shows a strong correlation with further developmental dynamics of the embryos (different cleavage cycle characteristics as well as lengths of blastomere cycles). An analysis of the sequence of human blastomere divisions allowed us to postulate that the effects of zygotic determinants are eliminated as a result of cleavage, and that, thereafter, blastomeres acquire the ability of own syntheses, regulation, polarization, formation of functional contacts, and, finally, of specific differentiation. This data on the early development of human embryos obtained using noninvasive methods complements and extend our understanding of the embryogenesis of eutherian mammals and may be applied in the practice of reproductive technologies.

Quantitative Study of the Heart in Staged Human Embryos in Stage 17

1987 ◽  
Vol 64 (5) ◽  
pp. 253-257
Author(s):  
Carlos A ◽  
MANDARIM-DE-LACERDA ◽  
Francisco Jose ◽  
B. SAMPAIO
Keyword(s):  
Quantitative Study ◽  
Human Embryos

Virtual ultrasound embryo autopsy – myth or reality? Part 1

2017 ◽  
Author(s):  
A.Yu. Blinov
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Prenatal Diagnosis ◽  
Medical Imaging ◽  
Embryonic Development ◽  
Human Embryos ◽  
Review Of Literature ◽  
Embryonic Period ◽  
New Methods ◽  
Central Nervous System Defects

A review of literature data on the study of human embryos using new methods of medical imaging is given. The possibility of prenatal diagnosis of severe central nervous system defects has been demonstrated already in the embryonic period at 8–10 weeks of gestation or at the age of 16 to 23 stages of the embryonic development period

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