I found this sentence on the internet "Deep in the middle of the brain are sections that control emotions"
It seems that "Deep in the middle of the brain" works as a noun, but what part of speech is the word "deep" in that phrase ? I can't configure out that that phrase is something can be a subject in a sentence. Or the subject here is "the middle of the brain" and "Deep in" works as an adverb ?
Please help me!
Thank you very much !
I have only change the order to (hopefully) make the grammar a little clearer.