Trophoblast: Difference between revisions
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==Introduction== | ==Introduction== | ||
(Greek, ''trophe'' = "nutrition" and -blast, a [[P#primordial|primordial]] cell) the trophoblast cells have an important contribution to extraembryonic tissues (fetal [[P#placenta|placenta]] and membranes) and processes of early development (adplantation, implantation and endocrine support of pregnancy). | (Greek, ''trophe'' = "nutrition" and -blast, a [[P#primordial|primordial]] cell) During early development the trophoblast cells have an important contribution to extraembryonic tissues (fetal [[P#placenta|placenta]] and membranes) and processes of early development (adplantation, implantation and endocrine support of pregnancy). | ||
In humans, week 1 blastocyst formation the outer layer of cells (adjacent to the zona pellucida) form a flat squamous epithelial layer of cells, the trophoblast layer. Week 2 following blastocyst hatching the trophoblast layer is involved with initial adhesion to the uterine wall and subsequent implantation within the wall. During this period the trophoblast layer differentiates into two distinct layers ([[S#syncitiotrophoblast|syncitiotrophoblast]] and [[C#cytotrophoblast|cytotrophoblast]]). | |||
(More? [http://embryology.med.unsw.edu.au/Notes/week2.htm Week 2 Notes] | [http://embryology.med.unsw.edu.au/Notes/week3.htm Week 3 Notes] | [http://embryology.med.unsw.edu.au/Notes/placenta.htm Placenta Notes]) | (More? [http://embryology.med.unsw.edu.au/Notes/week2.htm Week 2 Notes] | [http://embryology.med.unsw.edu.au/Notes/week3.htm Week 3 Notes] | [http://embryology.med.unsw.edu.au/Notes/placenta.htm Placenta Notes]) | ||
Revision as of 14:55, 1 March 2010
Introduction
(Greek, trophe = "nutrition" and -blast, a primordial cell) During early development the trophoblast cells have an important contribution to extraembryonic tissues (fetal placenta and membranes) and processes of early development (adplantation, implantation and endocrine support of pregnancy).
In humans, week 1 blastocyst formation the outer layer of cells (adjacent to the zona pellucida) form a flat squamous epithelial layer of cells, the trophoblast layer. Week 2 following blastocyst hatching the trophoblast layer is involved with initial adhesion to the uterine wall and subsequent implantation within the wall. During this period the trophoblast layer differentiates into two distinct layers (syncitiotrophoblast and cytotrophoblast).
(More? Week 2 Notes | Week 3 Notes | Placenta Notes)
