Thu18November0253AM 2

The following statements are true regarding sensory pathways:

True / False

Pain sensation travels in the lateral spinothalamic tracts Correct

Light touch travels in the posterior columns Incorrect answer selected

The substantia gelatinosa is in the dorsal horn Correct

Neurones transmitting pain sensation synapse in the posterior columns Correct

Temperature sensation travels in the posterior columns Correct

Explanation

The two main ascending pathways carrying nociceptive signals are the spinothalamic tract and the spinoreticular tract.

The spinothalamic tract carries pain and temperature sensation. The second order neurones from the dorsal horn cross to the contralateral spinothalamic tract termination in the thalamus.

At the spinoreticular tract second order neurones terminate in the reticular formation before projecting to the thalamus and hypothalamus.

Posterior (dorsal) columns carry light touch and proprioceptive sentation.

The substantia gelatinosa is in the dorsal horn of the spinal cord. It receives the primary afferent neurones (Ad and C) subserving the sensations of pain and temperature.

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