 Spinal nerves are referred to as “mixed nerves.”

In the thoracic region they remain distinct from each other and each innervates a narrow
strip of muscle and skin along the sides, chest, ribs, and abdominal wall.These rami are called the intercostal nerves.In regions other than the thoracic, ventral rami converge with each other to form networks of nerves
called nerve plexuses.