Seminiferous Tubules human

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Seminiferous Tubules (human)
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Ovary (cat)
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Ovum (squirrel)
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Primordial Follicle (human)
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Secondary Follicle (human)
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Addition of Yolk to Oocyte by Follicle Cells
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Maturing Secondary Follicle (monkey)
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Secondary Ooocyte in Antral Follicle (human)
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Oogenesis formation of polar bodies (rat,
human, and mouse, respectively)
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meiosis
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presentation)
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Frog (Xenopus) oogenesis
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Fertilization - Acrosome Reaction and Cortical
Reaction
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Sea Urchin rhodamine phalloidin staining of
fertilization cone (explosive actin
polymerization)
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Inositol triphosphate (IP3) is a second messenger
released from phosphatidyl inositol bisphosphate
(PIP) by phospholipase C, and binds to and
activates a calcium channel in the endoplasmic
reticulum, releasing a wave of Ca that spreads
across the ovum. Calcium ion stimlates the
release of cortical granules to the perivitelline
space, which widens as a slow block to polyspermy
and deactivates bindin receptors.
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Sea Urchin Cortical Reaction phase contrast
left intracellular Ca right
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Sea Urchin fusion of egg and sperm pronuclei
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Ascidean Cortical Rotation
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frog (Xenopus) cortical rotation (follows
gravitational rotation)
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frog (Xenopus) gravitational rotation, cleavage
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Branchiostoma Cleavage and Blastulation
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Xenopus Blastulation
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frog (Xenopus) blastulation
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Branchiostoma Gastrulation
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Xenopus Zygote Cytoplasmic Fate Map
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Xenopus median section blastulation bottle cells
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Xenopus Vegetal and Median Gastrulation
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Frog (Xenopus) Gastrulation, formation of yolk
plug, neurulation
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Xenopus Median and Parasagittal Gastrulation
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Frog (Xenopus) Gastrulation median optical
section
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Keller sandwich Cutout (frog)
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Keller sandwich explant (chordaneural elongation)
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Branchiostoma Neurulation
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Xenopus Neurulation