Topic 17: Reproductive System - Female Vagina Flashcards
1
Q
What is the function of the vagina?
A
- birth canal
- passageway for sperm
- pasageway for menstrual flow
2
Q
What is the mucosa of the vagina made of? (2)
A
- stratified squamous epithelium
- rugae (for stretching birth)
3
Q
What is the muscularis externa of the vagina made of?
A
- 2 layers of smooth muscle
4
Q
What is the adventitia of the vagina made of? (2)
A
- fibroelastic CT
- no serosa
5
Q
What is oogenesis?
A
gamete production within ovarian follicles
6
Q
oogenesis pathway diagram
A
7
Q
1 primary oocyte can form how many ovum or polar bodies?
A
- 1 ovum
- 2 or 3 polar bodies
8
Q
What are polar bodies?
A
discarded nuclear material
9
Q
How many oogonia are present in a 6 month fetus?
A
- 7 million
10
Q
How many primary oocytes (2n) are present at birth?
A
- 1 million in OVARIES
11
Q
Are oogonia present at birth?
A
no
12
Q
In lecture, what are oogonia?
A
- original germ cells that have not differentiated
13
Q
What happens to primary oocytes at birth? at puberty?
A
- enter meiosis I before birth, but arrested in prophase I
- at puberty, (400 000 oocytes remain), LH (luteinizing) stimulates completion of meiosis I
14
Q
What happens to secondary oocytes?
A
- begins meiosis II and arrests in metaphase II
in lecture, it is bc getting ready to separate sister chromatids
15
Q
How many secondary oocytes are ovulated a month? in a lifetime?
A
- 1 a month
- around 500 from puberty to menopause
