The frame of a car is the skeleton of an automobile. Just as bones serve as the core structure pieces for human beings, a car frame is the center of an automobile. The frame is strong, sturdy and built to withstand more than just normal wear and tear. Even though the frame itself may seem like one, solid piece, it is actually three separate sections that are welded together.
Also known as the nose section or "the doghouse", the front section of a car includes everything from the firewall area of the car to the front end. Since car frames are often salvaged by junk yards and automotive recyclers, the front end of the frame is usually removed in one, solid piece after serious car wrecks. Contained within "the doghouse" is the empty engine block. The engine is lowered into "the doghouse" once the car is assembled.
The midsection of a car surrounds the seating area of the vehicle. With the exception of convertibles, the center frame often rises above the front and rear sections of the frame and forms a protective shell around the driver and passenger areas. When the car is fully assembled, the midsection contains doors, side mirrors and glass windows, so the middle of the car is often referred to as "the greenhouse" because it is completely surrounded in glass.
Just as the front section of the car, the rear, or "the cathouse", is often salvaged after wrecks and is recycled by junk yards and automotive recyclers. This section of the car, when fully assembled, is designated for trunk space and all related parts such as the rear quarter panels and the rear bumper.