Subconscious.
The outside edge of an area is the perimeter.
It is called a area.
The outside of an organism has a surface area.
The area outside of an angle is called an arc, all angles can be turned into circles and therefore their interior is the measurement and their exterior is an arc. The area in which an angle lies is called a plane of space.
subpolar
The Surface Area
It is called a "coop." The fenced-in area outside the coop is called a "run."
It is called a blockade
Normally, the area outside of a city would be called a suburb. Or you could call it a rural area. Rural normally refers to an area where a lot of farming occurs.
The reticular system
They are called electrons.They have negative charge.
The room outside of a secretary's office is often called the reception area. Many companies will have a receptionist in this room to provide guests with hospitality until the time to see them.