Final answer:
The special sensory column at the level of the 4th ventricle is known as the medial lemniscus. The medial lemniscus is part of the dorsal column system.
Step-by-step explanation:
The special sensory column at the level of the 4th ventricle is known as the medial lemniscus. The medial lemniscus is part of the dorsal column system, which is responsible for carrying information about touch and proprioception.