perivitelline การใช้

• This signal acts after the egg has left the follicle cells so this signal is stored in the perivitelline space.
• The follicle cells secrete "'Torso-like "'into the perivitelline space only at the poles.
• Once the spermatozoon has entered, the peripheral portion of the yolk changes into a membrane, the perivitelline membrane, which prevents the passage of additional spermatozoa.
• In the cortical reaction, cortical granules directly beneath the plasma membrane are released into the space between the plasma membrane and the vitelline membrane ( the perivitelline space ).
• "S . gibbosa " have unique eggs because they do not possess a wide perivitelline space ( an important aspect to sardinella eggs and most pelagic fish ).
• Polyspermy is apparently allowed; when the yolk passes through the infundibulum of the oviduct and is exposed to sperm storage glands, the sperm preferentially seek out the near center ( but not the exact center ) of the germinal disc region and break through the perivitelline membrane.