Examples of oocyte in the following topics:
-
- The cell starting meiosis is called a primary oocyte.
- This results in the primary oocyte finishing the first meiotic division.
- At ovulation, this secondary oocyte will be released and travel toward the uterus through the oviduct.
- A primary oocyte begins the first meiotic division, but then arrests until later in life when it will finish this division in a developing follicle.
- This results in a secondary oocyte, which will complete meiosis if it is fertilized.
-
- Fusion between the oocyte plasma membrane and sperm follows and allows the sperm nucleus, centriole, and flagellum, but not the mitochondria, to enter the oocyte.
-
- Oocytes develop in (a) follicles, located in the ovary.
- The (b) follicle in this light micrograph has an oocyte at its center.
-
- Sponges may also become sequentially hermaphroditic, producing oocytes first and spermatozoa later.
- Oocytes arise by the differentiation of amoebocytes and are retained within the spongocoel, whereas spermatozoa result from the differentiation of choanocytes and are ejected via the osculum.
- Spermatozoa carried along by water currents can fertilize the oocytes borne in the mesohyl of other sponges.
-
- Twenty-four hours before fertilization, the egg has finished meiosis and become a mature oocyte.
- In humans, fertilization occurs soon after the oocyte leaves the ovary.
-
- In some mammals, melatonin has an inhibitory affect on reproductive functions by decreasing production and maturation of sperm, oocytes, and reproductive organs.