Which part of the central nervous system extends from the brain down the lower trunk?

The spinal cord is the structure within the central nervous system that extends from the brain down through the vertebral column, reaching into the lower trunk. It acts as a major conduit for information traveling between the brain and the rest of the body, facilitating reflex actions and transmitting sensory and motor information.

The spinal cord is divided into segments that correspond to different regions of the body. It is surrounded by protective bony vertebrae and is crucial for the functioning of the peripheral nervous system, which branches out from it to innervate limbs and organs. Understanding the spinal cord's role in the central nervous system is vital for comprehending how neurological signals are processed and how bodily movements are coordinated.