pack Flashcards
(20 cards)
What is Spermatogenesis?
The process by which sperms are formed.
When does Spermatogenesis start?
At puberty
What is the first stage of sperm development?How does it divide?
Spermtogoina
Divides: mitosis
What type of spermatocyte arises after multiple miotic divisions?How does it divide?
Primary spermatocyte (bc it is the first one after 0)
Divides by: Meiosis I (bc primary so 1)
What type of spermatocyte arises after the first meiotic divison?
Secondary spermatocyte
How do Secondary spermatocytes divide? what do they give rise to?
Divide: meiosis II
Give rise to: four Spermatids (the word is short so they are small and haploid)
What is the process by which spermatids develop? what do they develop into?
Process: Spermiogensis (bc they where spermatids, so it is going to be a small word)
Result Spermatozoa (bc it is حيوان منوي, zoa like zoo)
Where do sperm gain motility and mature?
Epididymis (bc the seminferous tubules already did the producing)
What is oogensis?
The process by which ova are formed
When does oogenesis start?
During fetal development and females are born with all the eggs they need.
What is the first developing egg called in oogenesis?How does it divide
Called: Oogonium
Dividess by: Mitosis
What happens by the third month of development?
Some oogonium give rise to primary oocytes which enter prophase I and remain arrested in prophase I until puberty
What keeps the primary oocytes in prophase I?
oocyte maturation inhibitor (OMI)
What is a primordial follicle?
One layer of follicular cells surrounds the Primary oocyte
Primary follicle
Primary oocyte with cuboidal/stratified Granulosa cells surrounding it
Secondary follicle
When fluid-filled spaces appear between the granulosa cells
Graafian follicle
Secondary oocyte, surrounded by corona radiata. (Antrum between granulosa cells)
How does a secondary oocyte form?
Secondary follicle matures, causes LH to surge, which results in completion of meiosis I and secondary oocyte forms.
When does meiosis II get completed in the secondary oocyte?
After fertlization.
Which stage of meiosis II does the secondary oocyte get arrested in?
Metaphase of Meiosis II
