Lesson Seven:Spam and Eggs.... Uh, I mean Sperm and Eggs

Eggs and Sperm…
…Where do they come from?
Oxford and SB2
Oxford: pp 90-93
SB2:pp 234 and 228, and read pp236-244 for clarification


Where does sperm come from?
SPERMATOGENESIS!!!
Seminiferous tubules in testis (over 100m per testis)
There are 2 layers: outer germ cell layer surrounded by a basement membrane

When the cells are in the Germ layer, they are called Spermatogonia. They are called Spermatocytes after the first round of Meiosis. AFter the second round of meiosis, they become spermatids. These cells become associated with nurse cells (seritoli cells), where they are fed and taken care of. They grow and differentiate, and become what we know as sperm.

Romeo-stasis
FSH! Where does it come from and what does it do?
It's released from the pituituary, and initiates the production of seminiferous tubules.
LH.What’s another name for this?
Interstitial Cell Stimulation Hormone
Stimulates intersticial cells (Leydig cells) to produce testosterone
Testosterone. What does it do?
It causes secondary sex characteristics to develope, increase in libido


Eggcellent
Oogenesis

Where do eggs come from?

Animation