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Recyclable Prezi - USE FOR ALL OF THE PRESENTATIONS!

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ιтαly vєиєzιαиσ

on 8 June 2014

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Transcript of Recyclable Prezi - USE FOR ALL OF THE PRESENTATIONS!

Johnny Lau
Karson Nguyen
Embryonic Development
Works Cited
What is Embryonic Development?
*The 8 weeks when the embryo is developing

*The embryo is a tiny body no bigger than the human thumb


The Zygote
* A fertilized egg that passes through the
fallopian tube


*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
The Morula
*Zygote divides several times into clusters of 16-32 cells



*3 days after fertilization, the Morula enters the uterine cavity.
The Blastocyst
*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

*Back straightens

*Fingers + toes can be differentiated clearly

*Embryo starts to move

*Embryo is 25-30mm long
Full transcript