Sea Urchin Embryology Back to Contents page

 

 

 

PATH OF DEVELOPMENT
(En Español)
1

SPAWN URCHINS

Detailed STILLS

ANIMATIONS:
Injecting KCL
MALE
FEMALE

If you have Netscape 4.x check out "Uni's World" [HELP]
If you have Internet Explorer 4+ see "Uni's World" [Help] PC only
If you have Internet Explorer 5+ see "SPAWN!"

2

OBSERVE SPERM MOTILITY

ANIMATIONS:

SPERM 2D
SPERM 3D

Use a fairly high concentration of sperm to maximize viewing.

3

SPERM EVENTS

ANIMATIONS:

ACROSOME
'NO' STORY

4

JUST THE RIGHT AMOUNT OF SPERM

ANIMATIONS:

TOO LITTLE
TOO MUCH
JUST RIGHT

If too many sperm then you get Polyspermic Development.
Use a low concentration of sperm to fertilize eggs.

5

WHEN SPERM MEETS EGG

ANIMATION:

EARLY DEVELOPMENT

Upon activation the cortical granules fuse with the plasma membrane of the egg

6

TO CELL DIVISION

ANIMATION:

FERTILIZATION

Mitosis involves the division of the centrosome and chromosomes


by John Morill

VIDEOS (300K):

Illustrates:

NUCLEAR MIGRATION

The nucleus centering

1-4

First two divisions

ZYGOTA

Sea Studios video
of first division

 

7

LATER DEVELOPMENT

ANIMATIONS:

URCHIN (50K)
3D to PRISM (200K)
GASTRULATION
(107K)
Pluteus to juvenile (107K)


by John Morill

8 "Fun" way to see fertilization and early development. [click on graphic] Also see the Study Guide

9
See our sister site:
Virtual Urchin