Session 1 - Part II Flashcards
Which part of the gonad will XX germ cells colonise?
The cortex
Which part of the gonad will XY germ cells colonise?
The medulla
What do female germ cells become when they colonise the gonadal cortex?
Oogonia (Diploid cells)
What do Oogonia do?
Proliferate rapidly by mitosis
When is the maximum number of Oogonia reached?
Mid gestation. However, most will die
When do Oogonia enter the first first phase of the 1st meiosis division?
Before birth. They are then suspended at this stage
Now called Primary Oocytes
What surrounds the Primary oocyte?
A single layer of granulosa cells of gonadal origin. Called primoridal follicle
When do the primordial follicles begin to develop further?
At puberty.
Most developing die, but one or two complete development and are released - ovulation
How long is the fertility period?
36 hours
What stage of the cycle precedes ovulation?
Preparation period
What happens in the Preparation period?
The ovum develops (Follicles developing)
The reproductive tract prepares for sperm transport and implantation (Uterus lining thickens)
The rest of the body undergoes changes to maximise chances of conception
What are the stages of the Menstrual cycle?
Preparatory phase (Follicular/proliferative phase)
Ovulation
Waiting phase (Leuteal/secretory phase)
It is timed from the onset of bleeding
What days in the menstrual cycle is the preparatory phase ?
0-12
What days in the menstrual cycle is the ovulation?
12-14
What days in the menstrual cycle is the waiting phase?
14-28
Why is there a waiting phase in the Menstrual cycle?
Because when the ovum is first fertilised it is too small to indicate its presence.
