Where can you find a diagram of a saguaro cactus?

I don't think there is one, but here's all I can say:

-The fruit on the cactus is called a fig.

-In late spring, flowers bloom on the cactus arms.

-The trunk of the saguaro is the stem.

-Inside the cactus, there are tubes that run water through the plant.

-There are spiky needles on the outside.

-Sometimes, the cactus is crested, where the top is in a fan-like shape. Biologists fight over why.