Flashcards
Mature oocyte
Cards in this deck (24)
- 1Which structures could be distinguished in a mature oocyte?- Nucleus
- Corona radiata (cumulus-+ follicular cells)
- Cortical vesicles / granules
- Zona pellucida
- Plasma membrane - 2What structure are the same as in any eucaryotic cell- Nucleus
- PM - 3Unique structures for the oocyte- Zona pellucida
- Cortical vesicles
- Corona radiata - 4Distinguish between mature oocyte and an ovum (human egg)It's the same.
|Mature oocyte => ovum| - 5Relationship between oocyte & follicle developmentAt all stages of follicle maturation (primordial, primary, secondary, mature), the primary oocyte is present. Only when follicle is fully mature, the primary oocyte continues meiosis 1 to become a secondary oocyte.
- 6Diploid2n
(2 chromosomes) - 7Haploid1n
(1 single chromosome) - 8GametogenesisThe development & production of haploid cells (gametes)
- Oogenesis-, creation of ovum
- Spermatogenesis; creation of sperm - 9Primordial germ cells (PGCs)Appear shortly after implantation of the zygote (4th week of preg.) in yolk sack to eventually migrate to the bisexual gonad and develop either in spermatogonia or oogonia
- 10Primary oocyteThe oogonia --> primary oocytes during oogenesis
- 11Primary, secondary & mature oocyte
- 12Bisexual gonad (cortex, medulla)Ovarian + testicular tissue. Present in a young embryo which is not yet developed specific for its sex gametes.
If XX: PGCs (primordial germ cells) will migrate to cortex of the bisexual gonad & develop female gametes.
If XY: PGCs will migrate to medulla of the bisexual gonad & form male gametes - 13Follicular cellsSurround ovarian follicle & provide nutrients to the developing oocyte for growth & maturation
- 14Zona pellucidaForm of extracellular matrix consisting largely of glycoproteins - providing mechanical protection
- 15Corona radiataMany layers of follicular cells & cells of cumulus oophonus adhering to the oocyte before it leaves the ovarian follicle
- 16Cortical granules (Cortical vesicles)Specialized secretory vesicles, which release their content to prevent entry of more than ONE sperm cell
- 17Theca interna- Rich in blood vessels
- Produces hormones - 18Theca externaLayer of connective tissue
- 19SpermatogenesisProcess; formation of sperm cells
- 20Sertoli cellsColumnar epithelial cells which are metabolically active (develope ER & mitochondria).
They surround the developing sperm cells & "feed them".
They also synchronize the FU of spermatogenesis - 21Sex cordsStructures that develop from the gonadal ridge.
In males; the sex cords become the testis cords by the action of the testis-determining factor protein, which help develop and nourish the Sertoli cells, while in females they become the cortical cords. - 22Seminiferous tubulesLocated within testes (testiklar) & are the specific location of meiosis & sperm cells formation.
- 23Spermatogonia2n precursors of sperm cells that are transformed from PGCs
- 24Primary spermatocyteA diploid cell that has derived from a spermatogonium & can subsequently begin meiosis & divide into 2 haploid secondary spermatocytes