Compilation of free information about human parts, their function, assembly, repair, and maintenance
Blastocyst
| Blastocyst | ||
|---|---|---|
| Carnegie stage | 3 | |
| MeSH | Blastocyst | |
| Dorlands/Elsevier | b_14/12187695 | |
The blastocyst is the structure formed in early mammalian embryogenesis, after the formation of the blastocele, but before implantation. It possesses an inner cell mass, or embryoblast, and an outer cell mass, or trophoblast. The human blastocyst comprises 70-100 cells.
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
| Mammalian development of embryo and development of fetus (some dates are approximate - see Carnegie stages) |
|---|
| Week 1:
Zygote -
Morula -
Blastula/Blastomere/Blastosphere
-
Archenteron/Primitive
streak -
Blastopore -
Allantois -
Trophoblast (Cytotrophoblast
-
Syncytiotrophoblast -
Gestational sac)
Week 2: Yolk sac - Vitelline duct - Bilaminar disc Week 3: Hensen's node - Gastrula/Gastrulation - Trilaminar embryo Branchial arch (1st) - Branchial pouch - Meckel's cartilage - Somite/Somitomere - Sclerotome - Myotome - Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial mesoderm, Intermediate mesoderm, Lateral plate mesoderm, Splanchnopleure, Somatopleure) Histogenesis and Organogenesis Uterine support: Placenta - Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) - Amniotic sac (Amnion, Chorion) |
The content of this section is licensed under the GNU Free Documentation License (local copy). It uses material from the Wikipedia article "Blastocyst" modified May 26, 2007 with previous authors listed in its history.
