Fig. 1
From: Stereological study of organelle distribution in human mature oocytes
Metaphase-II (MII) oocyte. (A) Live oocyte observed in the inverted microscope. (B, C) Oocyte observed in semithin sections. The oocyte (O) has a spherical shape and was separated from the zona pellucida (ZP) by the perivitelline space (pvs), where the first polar body (PB1) was located. In the PB1, it was possible to detect chromosomes (chr) and cortical vesicles (cv). The oocyte metaphase II plate (mp) extended from the cortex to the inner region. The ooplasm presented a homogeneous appearance. In the oocyte it could be detected surface microvilli (mv), cortical vesicles (cv) under the oolemma, mitochondria (mi), smooth endoplasmic reticulum (SER) small tubular aggregates (aSERT), SER large vesicles (LV), and lysosomes. Bars: (A) 20 μm; (B, C) 10 μm.
