Embryology and epithelium 💘 Flashcards
What’s a morulla cell
When the cell has divided so much that cell junctions have formed and u can no longer see individual cells
Blastocyst
Formed after 120-168 hours
Has a blastocoel cavity and inner cell mass and trophectode cells which are pluripotent
So trophoblast and puriblast
Day 9-15
There’s a yoke sack blastocoel and amniotic cavity
Amniotic cavity is made up of epi blast and hypoblast from ICM this is the bilaminar disc
Bilaminar disc develops into
Trol amin at disc Made up of ectoderm mesoderm and endoderm
Ectoderm becomes outer layer mesoderm becomes internal connective tissues such as organ systems and endoderm becomes the gut digestives system etc
Trilaminar disk has a primitive streak aswell
Ectoderm and mesoderm
Amnion
Trophoblast and mesoderm
Chorion
Endoderm and mesoderm
Yoke sac
Epithelial cells
One or more layers of cells covering the lining of the body and they are attached to a basement cell membrane
Mesenchymal cells
Mesh work of embryonic connective tissue derived from mesoderm forming connective tissues blood and lymphatic vessels
Haematopoietic
Blood cells that give rise to other blood cells derived from the mesoderm
In red marrow of most bone cells
Neural cells
Self generating multi potent cells that form the main phenotype of the nervous system
Differentiate into neurons astrocytes and oligodendrocytes (like Schwann cells)
Three roles of epithelium
Absorption eg simple squamous
Secretion eg contains goblet cells
Protection eg stratified squamous
Pseudostratified
Single layered but unorganized
All touch basement membrane but not all reach surface
Transitional
Multilayered and different cell shapes
Used for expanding eg in lungs
Columnar
Rectangular
