what is the white structure inside lettuce called in english
I mean the white crunchy stuff that is edible once all the lettuce leafs are cut

Question

what is  the white structure inside lettuce called in english 
I mean the white crunchy stuff that is edible once all the lettuce leafs are cut

Answer

from Russian Google translate gave me: "cabbage stalk"

BTW, in Russian it`s called very funny: "Kocheryzhka" -)

Answer

The stem.

Answer

It is called the core.  Most people only eat the green leafy parts though.  :)

Answer

I am not sure there is a special word for this part of the lettuce.  If there is, I have never heard it.  I think most often people will say "the leafy part of the lettuce" for the soft green leaves, and  "the white part of the lettuce" or "crunchy part of the lettuce" for the inside.