The posterior gray horn is a mass of gray matter found in every segment of the spinal cord. This mass of gray matter is part of a butterfly shape surrounded by white matter that is responsible for the processing system of sensory signals that travel within the spinal cord, according to Dartmouth. The posterior gray horn is also called the dorsal gray horn.
The posterior gray horn receives impulse signals from the nervous system and sends these signals up the spinal cord until they reach the brain. Sensory neurons attached to the dorsal gray horn receive signals from the body and send them to the spinal cord. The anterior gray horn, the other part of the butterfly shape, does the opposite of the posterior gray horn by sending signals from the brain to the body.
The dorsal gray horn is so named because it is towards the back, or outer part, of the spinal cord. The anterior gray horn is closer to the front of the body. The dorsal gray horn is one of four main columns of nerve cells that send electrical signals to and from the brain within the spinal cord. Without the posterior gray horn, the human brain cannot receive any nerve impulses from the rest of the body.