1. Embryology
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2. I. Definition:
= The branch of ____________ that studies the ___________and ______________________ of living organisms 
___________ (implantation to 8 weeks)
___________ (after 8 weeks)
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3. Development Processes:
II. Early Embryonic
Development Processes:
A. F___________
B. I___________
C. G___________
D. C___________
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4. A. Fertilization:
1. =______ and ___________ come together to form a fertilized egg (called a … )
Fertilization
Human Zygote
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5. 2. After fert., before implantation . . .
a. The zygote begins to divide
i. ______ few mitotic cell _______
are called ___________

6. 2. After fert., before implantation . . .
a. The zygote begins to divide
i. First few mitotic cell divisions
are called cleavage
b. Soon a ___________of cells is
formed, called a ....
A scanning electron micrograph of a human embryo at the eight-cell stage (day three).
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7. 2. After fert., before implantation . . .
a. The zygote begins to divide
i. First few mitotic cell divisions
are called cleavage
b. Soon a solid ball of cells is
formed, called a .... morula
c. Next, the morula will change
into a ______________________,
called a. . .
Blastocyst in cross-section: Cells of inner cell mass will give rise to the gastrula, outer cells will become apart of the placenta and other membranes.
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8. B. Implantation: The ___________ will ___________ to the uterine wall.
We call this attachment ___________
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9. C. Gastrulation:
1. The process in which the cells of the blastocyst develop into _____ ___________to form a
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10. Gastrulation
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11. C. Gastrulation (cont.) 2. The formation of 3 germ layers
a. E_________
Inner-most layer
(______________)
b. M___________
Middle layer
c. E_________
Outer-most layer
(______________________)
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12. D. Cell Differentiation
1. Once 3 germ cell layers formed in gastrula, then _________________(or giving cells specific jobs) begins a. 1st = _________________ i. Development of _______________ ii. Occurs soon after gastrulation is complete b. _____________ = organs start to form c. ______________ = limbs start to assume shape

13. III. _____embryonic Membranes
A. Membranes form to _______ and _________ the developing embryo.
1 = amnion membrane forms the ___________
(fluid filled ________ embryo)
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14. III. Extraembryonic Membranes (cont.)
2 = _______ forms outer most membrane.
This combined with _________form the organ called the ____________
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15. The ________ is a __________ organ which begins developing at ____________ of the blastocyst
The PLACENTA:
___________
_________,
_______, and
__________
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17. IV. Stem Cells
= ________ cells that have the ________ to differentiate