POLAR BODY MARKS 



ANIMAL POLE 

 Q PRONUCLEUS 

 —COPULATION PATH 

 OF EGG PRONUCLEUS 

 ENTRANCE PATH 

 or SPERM PRONUCLEUS 

 COPULATION PATH 

 OF SPERM PRONUCLEUS 

 CLE AVA GE PATH 

 OF SPINDLE AND 

 PRONUCLEI 



ME Dl AN AXIS OF EGG 



c. 



A M PH I ox us 



POLAR BODY 



Q PRONUCLEUS 



COPULATION PATH 

 OF EGG PRONUC LEUS 



MEDIAN AXIS OF EGG 



OLAR VIEW OF 



SPINDLE 



CL E AVAGE PAT H 



OF SPINDLE AND 



PRONUCLEI 



COPULATION PATH 



OF SPERM PRONUCLEUS 



ENTRANCE PATH 



OF SPERM PRONUCLEUS 



POLAR BODY 

 5 PRONUCLEUS 

 COPU LATION PATH 

 OF EGG PRONUCLEUS 



COPULATION PATH 

 OF SPERM PRONUCLEUS 



-CLEAVAGE PATH 



OF SPINDLE AND 



P RO N U C L E I 



POLAR VIEW OF 

 SPINDLE 



ENTRAN CE PATH 



OF SPERM PRONUCLEUS 



Fig 139 Penetration path of the sperm, copulation paths of the pronuclei the cleavage 

 path of the pronuclei, and first cleavage spindle. (A) Conditions such as fo""d .n the 

 urodele, Triton. (B) Conditions such as found in the protochordate, Styela. (C) Con- 

 ditions such as found in the protochordate, Amphioxus. 



289 



