30 Questions
How many days does intrauterine development in humans take?
280 days
What is the characteristic event seen in the 3rd week of IUL?
Gastrulation
What is the outcome of Gastrulation?
Formation of three germ layers
What is the cranial end of the Primitive Streak?
Primitive node
What is the time period for the Embryonic period?
3rd to 8th weeks
What is the name of the disk during the embryonic period?
Bilaminar disk
What forms the urogenital and anal membranes?
Cloacal membrane
What is the basis of the axial skeleton?
Notochord
What induces the overlying ectoderm to thicken and form the neural plate?
Notochord
What is the result of the floor of the notochordal canal degenerating?
Formation of the neurenteric canal
What forms a solid cord of cells after detaching from the endoderm?
Definitive notochord
Where does the notochordal process grow from?
Primitive pit
What is formed when the neural plate invaginates inwards?
Neural groove
What is the name of the cells that contain the neural crest?
Neural crest cells
What is formed when the neural folds come close and fuse?
Neural tube
What will the neural tube give rise to?
Central nervous system
On which day does the anterior neuropore close?
25th day
What is the term for the two regions where the ectoderm and endoderm remain in contact?
Embryonic disc
What is the location of the buccopharyngeal membrane?
Anteriorly in the embryo
What is the significance of the third week in embryonic development?
It is the week when the nervous system and cardiovascular system start developing
What is the role of the allantois in humans?
It has no role in humans
How many segments does the paraxial mesoderm divide into?
42 segments
What is the derivative of the paraxial mesoderm?
Bone, cartilage, muscle, and dermis of the skin
What is the significance of the number of somites?
It indicates the age of the embryo
What is the origin of the excretory elements of the urinary system and the gonads?
Intermediate mesoderm
What is the fate of the lateral plate mesoderm?
Gives rise to smooth muscles of the gut and serous membranes
What is the name of the cavity that develops in the lateral plate mesoderm?
Intraembryonic coelom
How many body cavities are derived from the Intraembryonic coelom?
3
What separates the Intraembryonic coelom from the extraembryonic coelom at the pericardial area?
Septum transversum
What gives rise to the epidermis of skin and other structures?
Surface ectoderm
Learn about the embryonic period of human development, from weeks 3-8. Covering gastrulation, formation of notochord and neural tube, and other key events.
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