Why does the back of the brain look like a butterfly in section?

The spinal cord is an organ of the central nervous system responsible for all vital functions. Like the entire nervous system, it is composed of neurons, which have bodies and processes. A cross section of the spinal cord shows gray and white matter. At the same time, in the middle there is a gray matter, which looks like a butterfly with characteristic protrusions. These are called the anterior and posterior horns, respectively, and are located equally to the left and right of the central canal of the spinal cord. The hind horns are composed of neurons that bring information from prescriptions to the spinal cord for analysis. The anterior horns are composed of neurons leaving the spinal cord with information to the working organs. The seals of these neurons form protrusions that look like the wings of a butterfly.