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TWO SYSTEMS: A BRIEF ANATOMICAL REVIEW
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A proper sensory examination requires knowledge of the skin areas supplied by individual dorsal roots (dermatomes) and peripheral nerves (Figure 5–1) as well as awareness of the ascending sensory pathways of the spinal cord, brain stem, and forebrain (Figures 5–2 and 5–3).
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There are two major sensory systems, each of which has first-order neurons in the dorsal root ganglia. The dorsal column–medial lemniscus system mediates touch (superficial, deep, and vibratory) through a variety of encapsulated mechanoreceptors and mediates proprioception (static and dynamic) through ...