EMBRYOGENESIS Flashcards
WHAT IS THE PROCESS OF ZYGOTE DIVISION CALLED?
CLEAVAGE
Cleavage is the process where a zygote (the fertilized egg) undergoes multiple rounds of cell division, resulting in the formation of smaller cells called blastomeres
WHERE IS THE MOST COMMON PLACE OF FERTILIZATION?
THAT FERTILIZATION TAKES PLACE IN THE FALLOPIAN TUBES
WHAT IS THE PROCESS CALLED AFTER THE FORMATION OF THE MORULA?
BLASTULATION
FORMATION THE BLASTULA FROM THE MORULLA
BLASTULA CONTAINS FLUID CAVITY CALLED BLASTOCOEL
EXPLAIN WHAT MORULA IS
MORULLA IS A SOLID BALL OF CELLS (BLASTOMERES) FORMEDAFTER THE FERTILIZED EGG (ZYGOTE) UNDERGOES SEVERAL ROUNDS OF CELL DIVSION (CLEAVAGE)
EXPLAIN WHAT BLASTULATION IS
IN HUMAN, BLASTULLA CALLED BLASTOCYST
FORMS
OUTER CELLS/ TROPHOBLAST – POLARIZED, ONE SIDE DIFFERENT FROM OTHER.
WATERY FLUID OF BLASTOCOEL SECRETED BY TROPHOBLAST CELLS.
INNER CELL MASS/ APOLAR
GIVE RISE TO ALL TISSUES OF BODY
EMBRYONIC STEM CELLS DERIVED FROM INNER CELL MASS.
ON WHICH DAY IS THE IMPLANTATION GIVEN?
BLASTOCYST IMPLANTS IN UTERUS ABOUT DAY 6-10
BHCG SECRETIONS BEGINS
WHEN ONE BLASTOCYST IMPLANTS THE PLACENTA BEGINS TO GROW
THE PLACENTA IS WHAT SYNTHESIZES AND SECRETES BHCG
WHAT IS THE GASTRULATION
THIS STEP, IS WHEN THE BLASTULA IS CONVERTED INTO THREE LAYER STRUCTURE CALLED GASTRULA.
THREE GERM LAYERS> ECTODERM, MESODERM. AND ENDODERM.
INNER CELL MASS FORM THE BILAMINAR DISC > EPIBLAST AND HYPOBLAST.
ANOTHER IMPORTANT STEP IN THE PORCESS OF GASTRULATION IS FORMATION OF THE PRIMITIVE STREAK.
EXPLAIN WHAT PRIMITIVE STREAK IS
FORMED BY INVAGINATION OF EPIBLAST CELLS, CREATES A VISIBLE LINE / STREAK / IN BLASTOCYST, PRESENCE INDICATES THE GASTRULATION HAS STARTED AND THE GERM LAYERS BEGINS TO FORM.
EPIBLAST DEVELOPS INTO THREE GERM LAYERS/ ECTODERM. MESODERM AND ENDODERM/
WHEN YOU SEE THE PRIMITIVE STREAK THAT MEANS THE GASTRULATION HAS BEGUN AND THE THREE GERM LAYERS ARE BEGINNING TO FORM.
