on the basis of light microscopic observations , four basic types of oocytes could be recognized : ( 1 ) oocytes with nuclei containing diffused or filamentous chromatin , ( 2 ) oocytes with metaphase i chromosomes or an extruded polar body , ( 3 ) oocytes with nuclei possessing massive clumps of chromatin frequently associated with the nucleolus , and ( 4 ) degenerating oocytes with no distinguishing cytologic features .
C0007610
nuclei
C0008546
chromatin