What are differences and similarities between "crude" touch and "fine" touch sensations?
What will be an ideal response?
Crude touch refers to sensations from stimulation of tactile receptors of low sensitivity with large receptive fields. In contrast, fine touch refers to tactile receptors of high sensitivity with small receptive fields. Crude touch ascends in the anterior spinothalamic pathway whereas fine touch ascends in the posterior column pathway. The spinothalamic pathway crosses the neural axis in the spinal cord but the posterior column pathway crosses in the medulla oblongata. Both ultimately project to the somatosensory cortex on the contralateral side of the stimulus in the same region of cortex.
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