cytoplasmic changes which were regarded as being related to oocyte maturation were a decrease in the number of vacuoles and multivesicular bodies , an increase in the volume of the endoplasmic reticulum , a clustering of mitochondria , and the appearance of aggregates of tubuli of the smooth endoplasmic reticulum surrounded by mitochondria and mitochondria-vesicle complexes .
C0010834
cytoplasmic
C0230825
multivesicular bodies