Gametogenesis & Fertilisation Flashcards
(38 cards)
Finger like projections of fallopian tubes
Fibmbriae
Regions of Fallopian Tube (From Ovary to Uterus Direction)
Infundibulum
Ampulla
Isthmus
Interstitial/Intermural Region
Im always irrationally irritated
Innit fun, die bully?
Arm puller
Is miss listening
Just remember the last one
Summary of Oogenesis
That is all
Region of fallopian tube where fertilisation tends to take place
Ampulla
Where are the eggs of the ovary released into
Abdominal/Peritoneal Cavity to be caught by fimbriae
How many primary follicles develop monthly after female puberty
5-12 primary follicles
Septum Pellucidum and what is it made of
Separation between ovum and the growing follicles around it
It is an acellular mucopolysaccharide layer/GAGs
When are oogonia formed
Before birth
What happens to oogonia after birth (don’t just say they become x)
A single layer of follicular cells surround the egg
What happens to all but one (mostly) of the growing follicles
Degeneration to form a small Corpus Atreticum or Scar
What happens to the remaining growing primary follicle(s) - that do not degenerate
A fluid filled space (Antrum) appears in the surrounding cells; those cells begin to secrete oestrogen
The outside cells are dubbed theca externa; inside are theca interna
Extrerna are mostly inactive & avascular while interna produce oestrogen
How is the secondary follicle referred to
Graafian Follicle
Stratum Granulosum (oogenesis)
Cells in graafian follicle that do not surround oocyte and instead surround the enlarged antrum
They produce progesterone
Cumulus Oophorus
Cells that surroud the oocyte in the graafian follicle
What is released from the mature follicle when it ruptures
Ovum
What do the cells that directly surrounded the oocyte (Cumulus Oophorus) in the graafian follicles become
Corona Radiata
What happens to the septum pellucidum after ovum formation
Expansion to become the zona pellucida
Diamater of ovum
130 Micrometers
What happens to the Stratum Granulosum of oogenesis
It becomes the corpus luteum
What happens to the corpus luteum if there is no fertilisation
It degenerates into the corpus albicans
What is the lifespan of the corpus luteum
12 Days
What happens to the chromosomes of the diploid egg when dividing and also to the haploid egg during fertilisation
They form Polar Bodies
What does the embryo do to the corpus luteum
Secretes hCG (Human Chorionic Gonadotropin) which sustains the corpus luteum for it to become the corpus luteum of pregnancy (which eventually degenerates into the corpus albicans anyway)
Summarise Spermatogenesis
Stem Cells divide into spermatogonium (46 chromosomes)
Divide to form primary spermatocytes (46)
Undergo 1st meiosis to form secondary spermatocyes (23, X or Y)
2nd meiosis to form spermatids (23, X or Y)
Maturation to become spermatozoa (23, X or Y)
Stem Cells, SpermatoGonia, Primary, Secondary, Spermatids, Spermatozoa
Sam Got Pissed, So Tomorrow; Zoo!
