Sensory Physiology
207
Somatosensory cortex
(b)
Dorsal column system
Dorsal column
of spinal cord
Receptors for body movement, limb positions,
fine touch discrimination, and pressure
(a)
Anterolateral system
Anterolateral
column of
spinal cord
Thalamus
Collaterals to
reticular formation
Brainstem
Afferent neuron from pain or temperature receptor
Spinal cord
Figure 7–19
(a) The anterolateral system. (b) The dorsal column system. Information carried over collaterals to the reticular formation in (a) and (b)
contribute to alertness and arousal mechanisms.
Figure 7–19
physiological
inquiry
If an accident severed the left half of a person’s spinal cord at the mid-thoracic level but left the right side intact, what pattern of sensory
defi cits would occur?
Answer can be found at end of chapter.
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