Question

what loss would result from cutting through the medial lemniscus on the right side?
loss of fine touch sensation on the left side of the body
complete paralysis on the left side of the body
loss of fine touch sensation on the right side of the body
loss of pain sensation on the left side of the body
loss of pain sensation on the right side of the body

Explanation:

The medial lemniscus is part of the posterior column - medial lemniscus pathway. This pathway is responsible for transmitting fine touch, vibration, and proprioception. The fibers in the medial lemniscus cross (decussate) at the level of the medulla. So, damage to the right - side medial lemniscus would affect the left side of the body's fine touch (since the sensory information from the left side of the body has already crossed over to the right - side medial lemniscus at the medulla level). Paralysis is related to motor pathways (like the corticospinal tract), not the medial lemniscus. Pain sensation is carried by the spinothalamic tract (anterolateral system), not the medial lemniscus.

Answer:

loss of fine touch sensation on the left side of the body