Which syndrome results in intact motor function but loss of sensory modalities?

• A. Brown-Sequard syndrome
• B. Central cord syndrome
• C. Anterior cord syndrome
• D. Posterior cord syndrome

Answer: (D)

The syndrome associated with intact motor function but the loss of sensory modalities is posterior cord syndrome. This condition specifically affects the posterior columns of the spinal cord, which are responsible for transmitting sensory information such as proprioception, vibration, and fine touch. As a result, individuals may have preserved motor function due to the preservation of the corticospinal tracts in the anterior part of the spinal cord, but they will experience significant sensory deficits related to the posterior columns.

In posterior cord syndrome, because the pathways responsible for these sensory modalities are compromised, patients might have difficulty with balance and coordination, relying heavily on visual cues for movement, but they maintain the ability to move their muscles effectively. This distinct presentation sets posterior cord syndrome apart from other spinal cord syndromes, where motor functions and different sensory modalities might be affected in varying degrees.