Microviewer WS- Embryology
Name:
Slide 1: Ball of Cells
a. Draw the frog Embryo. Magnification__________X
b. How many cells are present?
c. What is a blastula?
d. How do the cells compare in the upper and lower areas?
Why do they vary this way?
Slide 2: The Gastrula
a. Draw the Gastrula. Magnification _________X
b. How does this embryo size compare with that of slide one?
c. Where are the yolk cells?
d. What germ layers are present? Label them in your picture.
e. What do the germ layers become in the frog?
Slide 3: Neural groove
a. Draw the Embryo. Magnification __________X
b. How old is this embryo and what are we looking at?
c. What will G become?
d. What germ layer produced the neural groove?
Slide 4: Neural Tube
a. Draw the frog embryo. Magnification __________X
b. The neural tube extends and forms what part of the frog?
c. What will the group of cells at S become?
d. What will the mesoderm form??
e. What will the endoderm (N) form?
Slide 5: Hatching Stage
a. Draw frog hatchling. Mag:__________X
b. What is the actual size of this hatchling?
c. What do you call this form of the frog?
d. What parts can you see in this slide? Label them.
e. How does this slide relate to the next 3 slides?
Slide 6: Eye section
a. Draw the Frog embryo. Magnification ____________X
b. What is the concave mass of cells at R becoming? Label it.
c. How is the eye attached to the brain??
d. Where will the mouth form?
e. Go back to slide 5 and explain the location of this crosssection.
Slide 7: Ear Section
a. Draw the Frog embryo. Magnification ______X
b. How does the brain (B) look in this slide compared to the
last?
c. At the bottom of the mouth there are four ridges. What is
the purpose of these ridges?
d. What will happen in a few days to this frog embryo?
Slide 8: Below Head
a. Draw the Frog embryo. Magnification __________X
b. Label ALL parts in this slide.
c. What will happen to N when the yolk is all used up?
d. How do you think a human relates to the embryology of a
frog?