Final answer:
The tissue in the spinal cord that consists of neuron cell bodies without myelinated axons is called gray matter.
Step-by-step explanation:
The tissue in the spinal cord composed of the cell bodies of neurons, which do not have myelin on their axons, is called gray matter. The spinal cord contains both gray matter which is primarily composed of neuron and glial cell bodies as well as interneurons, and white matter which consists mainly of myelinated axons. The gray matter is shaped like a butterfly within the white oval of the cross-section of the spinal cord and is critical for processing and relaying information in the spinal cord.