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| Description: Graphics in the diagram show the sequence of events, not movements. Photos show human ovaries. The mature follicle is about the size of a pea and projects from the ovary surface. 1. A follicle begins to mature;the primary oocyte enlarges and secretes proteins, and follicle cells around it divide. 2. Fluid-filled cavity begins to form in the follicle’s cell laye 3. Primary oocyte completes meiosis I and undergoes unequal cytoplasmic division to form a secondary oocyte and the first polar body. 4. Ovulation. Follicle wall ruptures, releasing the secondary oocyte and surrounding cells. 5. Follicle cells left behind after ovulation develop into a corpus luteum that secretes hormones. 6. If pregnancy does not occur, the corpus luteum degenerates. Picture Stats: Views: 160 Filesize: 529.24kB Height: 1500 Width: 1437 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47407 |