Milk messengers in the pituitary
Lactotropes (say LAK-toe-tropes) live in the front part of your pituitary gland, a pea-sized gland just under your brain.
Everybody has them: kids and grown-ups, boys and girls. They are full of tiny bubbles of a hormone called prolactin (say pro-LAK-tin).
Most of the time, your brain sends a calm-down signal that keeps lactotropes from making too much prolactin.
Wow!
Prolactin isn't just for people. In some fish, it helps them handle moving between salty and fresh water!