Resumen
The infrastructure of a 4-cell human embryo undergoing development in vivo is described. The embryo recovered from the Fallopian tube 130 h after a single episode of intercourse and 70 h after the luteinizing hormone peak in plasma, was partially surrounded by cumulus cells. The blastomeres, of even size, were nucleated and had a similar distribution of cytoplasmic organelles. No signs of abnormality or cellular degeneration were observed. Transmission electron microscopy of serial sections revealed the presence of primitive desmosomes between cells, abundant vesicles within the blebs of the outer sheet of the nuclear membrane, blebbing of the inner sheet of the nuclear membrane and close association between the inner sheet of the nuclear membrane and the intranuclear annulate lamellae. Nucleolar precursors lacking the structural organization of mature nucleoli were also found. Similarities and differences between this and other pretmplantation human embryos reported earlier are analysed.
| Idioma original | English |
|---|---|
| Páginas (desde-hasta) | 680-688 |
| Número de páginas | 9 |
| Publicación | Human Reproduction |
| Volumen | 4 |
| N.º | 6 |
| Estado | Published - ago 1989 |
Huella dactilar
ASJC Scopus subject areas
- Statistics, Probability and Uncertainty
- Applied Mathematics
- Physiology (medical)
- Reproductive Medicine
- Obstetrics and Gynaecology
- Rehabilitation
- Developmental Biology
- Physiology
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Ultrastructure of a 4-cell human embryo developed in vivo. / Pereda, J.; Cheviakoff, S.; Croxatto, H. B.
En: Human Reproduction, Vol. 4, N.º 6, 08.1989, p. 680-688.Resultado de la investigación: Article
TY - JOUR
T1 - Ultrastructure of a 4-cell human embryo developed in vivo
AU - Pereda, J.
AU - Cheviakoff, S.
AU - Croxatto, H. B.
PY - 1989/8
Y1 - 1989/8
N2 - The infrastructure of a 4-cell human embryo undergoing development in vivo is described. The embryo recovered from the Fallopian tube 130 h after a single episode of intercourse and 70 h after the luteinizing hormone peak in plasma, was partially surrounded by cumulus cells. The blastomeres, of even size, were nucleated and had a similar distribution of cytoplasmic organelles. No signs of abnormality or cellular degeneration were observed. Transmission electron microscopy of serial sections revealed the presence of primitive desmosomes between cells, abundant vesicles within the blebs of the outer sheet of the nuclear membrane, blebbing of the inner sheet of the nuclear membrane and close association between the inner sheet of the nuclear membrane and the intranuclear annulate lamellae. Nucleolar precursors lacking the structural organization of mature nucleoli were also found. Similarities and differences between this and other pretmplantation human embryos reported earlier are analysed.
AB - The infrastructure of a 4-cell human embryo undergoing development in vivo is described. The embryo recovered from the Fallopian tube 130 h after a single episode of intercourse and 70 h after the luteinizing hormone peak in plasma, was partially surrounded by cumulus cells. The blastomeres, of even size, were nucleated and had a similar distribution of cytoplasmic organelles. No signs of abnormality or cellular degeneration were observed. Transmission electron microscopy of serial sections revealed the presence of primitive desmosomes between cells, abundant vesicles within the blebs of the outer sheet of the nuclear membrane, blebbing of the inner sheet of the nuclear membrane and close association between the inner sheet of the nuclear membrane and the intranuclear annulate lamellae. Nucleolar precursors lacking the structural organization of mature nucleoli were also found. Similarities and differences between this and other pretmplantation human embryos reported earlier are analysed.
KW - Human egg
KW - Human embryo
KW - Preimplan-tation development
KW - Ultrastructure
UR - http://www.scopus.com/inward/record.url?scp=0024357111&partnerID=8YFLogxK
M3 - Article
VL - 4
SP - 680
EP - 688
JO - Human Reproduction
JF - Human Reproduction
SN - 0268-1161
IS - 6
ER -