Lecture 11: Reproductive System Flashcards
How many chromosomes do gamestes have?
23
Gamestes go through what process?
meiosis
What do gonads form from?
mesoderm
Gonads turn to what?
ovaries & testes
What are the 2 layers of the gonads?
thick outer cortex & inner medulla
What is the name of the basic germ cell?
primordial
How do the early germ cells form on the surface
?
- migrate inward during gastrulation across allantois
- cross hindgut wall & migrate to genital ridge
What is the Wolffian duct?
- derived from archinephric duct
- stays in males
What is the Mullerian duct?
- forms laterally
- stays in women
What causes the expression of the SRY gene on Y chromosome?
when male germ cells move into the medulla of the ridge
What produces anti-Mullerian hormone?
sertoli cells in seminiferous tubules
What produces testosterone?
leydig cells
What occurs when germ cells move into cortex of gonadal ridge?
forms ovaries
What does the Mullerian duct differentiate into?
- oviducts
- uterus
- cervix
- vagina
What do primordial cells form in mitosis?
primary oocytes
When does a primary oocyte activate?
at puberty; every 28 days
What does the primary oocyte produce?
secondary oocyte & 1 polar body (23 pairs of chromatids each)
When does meiosis 2 occur?
after fertilization
What does the secondary oocyte produce?
1 haploid ovum & second polar body (with 23 chromosomes each)
What produces LH production?
male pituitary galnd
What does FSH trigger?
- females -> oocyte development
- males -> sperm production in seminiferous tubules
What process do spermatogonia go through?
mitosis
What does a daughter cell form?
forms 4 haploid spermatids supported by sertoli cells
