Lecture 12 - Oocytes & Oogenesis

ovary

female gonad

oocyte

female gamete

ovary

female gonad

oocyte

female gamete

follicles

oocytes are contained within what?

granulosa cells

cells contained within follicles

theca cells

cells contained outside of follicles

granulosa cells

cells responsible for oogenesis

oolema

plasma membrane of oocyte

Perivitelline space (PVS)

space where polar bodies are contained

zona pellucida

protein coat surrounding oocyte

1) zona pellucida

2) perivitelline space

3) oolema

List the three layers of the oocyte from superficial to deep

oogenesis

formation, development, & maturation of the female gametes

1) Tunica albuginea

2) Cortex

3) Medulla

List the three layers of the ovary from superficial to deep

follicles, oocytes, & CL

Cortex contains what three things?

blood vessels, lymphatics, & neurons

Medulla contains what three things?

prenatally

When does mitosis stop & the oogonia begin meiosis in females?

primordial germ cells

Oogonia develop from…

1) Prophase I

2) Metaphase I

3) Anaphase I

4) Telophase I

5) Prophase II

6) Metaphase II

7) Anaphase II

8) Telophase II

List the 8 steps of meiosis

prophase I during meiosis

Meiosis is arrested during which stage?

primary oocytes (4n)

After oogonia (2n) go through meiosis, they become…

cAMP

What inhibits maturation promoting factors (MPFs) to prevent meiosis?

maturation promoting factors (MPFs)

factors that promote meiosis

closing of gap junctions (no more cAMP)

To resume meiosis during puberty what must happen?

LH

What hormone surges and results in ovulation?

oogonia (2n) —meiosis—> primary oocyte (4n) —LH surge—> secondary oocyte (2n) —ovulation—> 1n —fertilization—> zygote

List the steps of oogenesis and fertilization from oogonia to zygote

2

How many polar bodies are formed after fertilization?

polar body

small haploid cell formed during oogenesis & present in the perivitelline space