Are potato sprouts roots or stems?

[WinkOsmosis]

I'm growing a potato plant to poison my roommates. I want to know if the sprout is root or stem material. The potato I am dealing with has a sprout that looks like a stem but with rooty outgrowths. I would take a pic but my camera batteries are dead.

 

[Yo Ma Ma]

They are or will be stems.

 

[Hayabusa Rider]

Originally posted by: Yo_Ma-Ma
They are or will be stems.

I must admit I have not heard of anyone attempting murder with a potato before. Novel.