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Recyclable Prezi - USE FOR ALL OF THE PRESENTATIONS!
Transcript of Recyclable Prezi - USE FOR ALL OF THE PRESENTATIONS!
What is Embryonic Development?
*The 8 weeks when the embryo is developing
*The embryo is a tiny body no bigger than the human thumb
* A fertilized egg that passes through the
*In: - 24-36 hours it divides into 2
- 12 hours later it divides into 4
* Known as Cleavage
*At each stage, the cells become smaller,
gradually approching normal body cell size
*Zygote divides several times into clusters of 16-32 cells
*3 days after fertilization, the Morula enters the uterine cavity.
*6 days after fertilization, the Cell cluster forms a hollow cavity
*Floats in uterus and lands in thick uterus lining (endometrium) after 48 hours
*Blastocyst burrows itself in endometrium
The Embryonic Disk
*Within endometrium, embryonic disk forms
*Embryonic disk seperates cell cluster into amniotic cavity (Sac that fills w/ liquid and folds over to cover the disk)
*The sac transports nutrients the embyro during the 2nd & 3rd weeks
*The Embyronic disk developments into 3 circular sheets (Ectoderm, Mesoderm, Endoderm) where the body structures will form from
Last few weeks of development
*The cells continue to divide into groups that become tissues and organs
*The brain + head forms 1st, the body forms 2nd, the arms form 3rd, and the legs form last
*After 8 weeks, the embyro is known as a fetus
Third week of development
Fourth week of development
Eighth week of development
*Neutral tube forms to become spinal cord
*Embryo is 2-3mm long
*Heart pulses and sends blood through vessels
*Intestines, liver, pancreas, lungs, and limbs begin to form
*Embryo is 4mm long
*Face and neck begin to take shape
*Fingers + toes can be differentiated clearly
*Embryo starts to move
*Embryo is 25-30mm long