What are nerves primarily composed of?

Nerves are primarily composed of bundled axons, which are the long, threadlike parts of nerve cells (neurons) that transmit signals away from the cell body. These axons bundle together to form a nerve, allowing for the efficient transmission of electrical impulses over long distances within the body. The structure of nerves, with multiple axons grouped together, facilitates coordinated communication between different parts of the nervous system, such as sending signals from the brain or spinal cord to muscles or organs and relaying sensory information back to the central nervous system.

While neurotransmitters are crucial for communication between neurons, they are not structural components of nerves themselves. Sensory receptors are specialized structures that detect stimuli and send information to the nervous system but are also not components of nerves. Similarly, neuroglial cells, or glial cells, provide support and protection for neurons but do not form the main composition of nerves; rather, they assist in maintaining the overall health and functionality of the nervous system. Thus, bundled axons are the defining structural feature of nerves, making this the correct answer.