Development of the central nervous system Flashcards
What is the begining axes of the embryo ?
The primitive groove
What is the use of the primitive groove ?
Allow the migration of the cells inside the groove
Describe the migration of the three differents type of cells in the primitive groove.
Entoblast -more ventral part of the embryonic disc
Mesoblast - central part
Epiblast - dorsal part
How does the notochords form ?
The mesoblast forms a finger shape and goes into a notochord. The mesoblast become the Para Axial Mesoblast that will transform into the somitomers.
How is formed the neural tube ?
The ectoblast become the neuro-ectoblast. The notochord produces a proliferation of cells in the neuro ectoblast that goes thicker and become the neural plate.
Invagination of the neural plate and formation of the neural crest -> neural groove
attachement to form the neural tube and formation of the epiblast.
finally, this forms the Spinal chord
Site the primary and the secundary vesicles
Prosencephalon (Telencephalon, diencephalon)
Mesencephalon
Rhombencephalon (Myelencephalon, metencephalon
Where the cell proliferate and differenciate ?
Germinal zone of the tube
What is the final region after the differenciation of the cells ?
In the marginal zone.
What form the somitomers ?
The notocord
what is produced by somitomers ?
Myotome, dermatome and sclerotome
What are rhombomeres ?
produced by rhombencephalon, produce de cephalic metamery.
What is the fate of the neural crest ?
produce pseudo unipolar or multipolar neurones.
What are the two first section in the SC ?
AJAR plate (sensitive) BASAL plate (motor)
What is the differenciation that happend within the AJAR and BASAL plate ?
AJAR : sensitive somatic / sensitive visceral
BASAL : motor somatic/motor visceral.
What is the fate of the Myelencephalon ?
Medulla
