Whenever a group of angels passed by him,  they were dazzled by the beauty of his form and by his height.

They had never seen anything like that or even close. Satan passed by him and saw him, so he asked, for what purpose have you have been created?" Then he hit him, but he noticed it was hollow, so he entered inside from his mouth and came out at the other end.

Then he said to the angels, 
"this is a hollow creature which cannot stand nor keep itself together."

Then he asked the angels - "suppose this thing is given preference over you, what would you do then? They said, we will obey our Lords command in his regard,
so satan said to himself, "By ALLAH if this thing is preferred over me, I will contest, but if i am preferred over it, i shall destroy it."

To this does the Almighty refer in the verse, "..........and i know what you manifest and what you hide" (Quran, 2:33)

When ALLAH (swt) wanted to breathe the soul into Adam, he ordered the soul to enter through his mouth. But the soul said 
"it is an entrance deep and dark" he repeated this order and it repeated the same answer.
The same thing happened third time, and the fourth time he said
"enter into it against your wish and come out of it likewise".

Once the soul was breathed into him, the first place it entered was his brain, and it remained there for 200 years.