Final answer:
The term used to describe a network of nerves is E. plexus. It is a network of fibers or vessels that can be part of the nervous system, such as the enteric plexus.
Step-by-step explanation:
The question a student has asked concerns the term used to describe a network of nerves or nervous tissue. Given the options provided, the correct answer is E. plexus. A plexus is a network of fibers or vessels that can apply to nervous tissue, as seen in the enteric plexus, which is an extensive network of axons and neurons in the wall of the intestines. The gyrus (plural gyri) refers to the ridges on the brain's surface, while a sulcus (plural sulci) is a groove between gyri. A nucleus is a collection of neuron cell bodies within the central nervous system (CNS), and a tract is a bundle of axons within the CNS.