Gametogenesis - Oogenesis

Question 1

3 Phases in oogenesis

Answer 1

1. Multiplicative phase
2. Growth phase
3. Maturation phase

Question 2

What is needed for the meiotic clock to be removed

Answer 2

LH (Luteinizing Hormone

Question 3

A woman is born with only about ________ eggs

Answer 3

800,000

Question 4

During the 30–40 years that a woman has menstrual cycles, she will ovulate about 400 eggs; the remaining 99+% of eggs undergo _______, or degeneration.

Answer 4

atresia

Question 5

Ovarian stroma

Answer 5

1. Cortex - site where follicles are located
2. Medulla - centered vessels

Question 6

a narrow rope of connective tissue that attached the ovary to the broad ligament within the body cavity.

Answer 6

mesovarium

Question 7

Within the ovary you should see two regions: an outer _______, containing circular structures called follicles, and an inner ________, containing connective tissue, nerves, lymph vessels, and many large blood vessels.

Answer 7

cortex; medulla

Question 8

a single layer of small, cuboidal cells just outside of the tunica albuginea

Answer 8

mesothelium

Question 9

is a phase of the female menstrual cycle that involves the release of an egg (ovum) from one of the ovaries. It generally occurs about two weeks before the start of the menstrual period.

Answer 9

Ovulation

Question 10

First, the follicle cells become cuboidal and/or columnar, and they increase in numbers. The multiple layers of follicle cells are the ________ (these cells will be providing nutrients for the egg).

Answer 10

stratum granulosum

Question 11

The follicle cells are also secreting a fluid, the ______, which gradually accumulates in spaces that develop between follicle cells.

Answer 11

liquor folliculi

Question 11

__________ secretes nutritive fluid for the follicle cells, as well as some estrogen- and androgen intermediary compounds that the follicle cells then convert to estrogen.

Answer 11

theca interna

Question 12

Maturation of amphibian egg cells has three phases:

Answer 12

1. Previtellogenic (before the deposition of yolk) phase
2. Vitellogenic (major period of yolk deposition) phase
3. Maturation phase (oocyte is released from its meiotic block through the action of progesterone).

Question 13

The maturing egg goes to another meiotic block (at metaphase II) due to the action of __________

Answer 13

cytostatic factor

Question 14

the part of the egg having numerous large yolk granule

Answer 14

Vegetal pole

Question 15

the part with thin (translucent) cytoplasm where nucleus or germinal vesicle of the eggs about to ovulate can be seen.

Answer 15

Animal pole

Question 16

the egg membrane

Answer 16

Vitelline membrane

Question 17

small cells between the egg vitelline membrane and the theca interna

Answer 17

Follicle cell

Question 18

the connective tissue with blood vessel and nerves.

Answer 18

Ovarian stroma

Question 19

Isolecithal - small amount of yolk (develop internally)

Mesolecithal - moderate amount of yolk (ex. frogs)

Telolecithal - enormous amount of yolk (ex. chicken - no metamorphosis, 21 days to hatch)