What are the four regions within the adrenal gland?

What is the starting material for synthesis of the corticortisoids?

Where in the adrenal gland are the mineral corticoids, glucocorticoids and androgens synthesised? What are the actions of these hormones?

What are the hormones synthesized in the adrenal medulla? What amino acid are they synthesized from?

What is the stimulus that causes secretion of the adrenal medulla hormones?