14. Axons of the dorsolateral tract extend to what area? a. cerebellum b. cerebral cortex c. spinal cord d. thalamus
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Step 1: Identify the dorsolateral tract (Lissauer's tract) — a bundle at the dorsal root entry zone carrying small-diameter primary afferent fibers (pain and temperature). Show more…
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First order sensory neurons of the posterior column pathway end in the: a. spinal cord b. brain stem c. thalamus d. postcentral gyrus e. precentral gyrus
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23. Regarding the posterior columns, our perception of a given sensation as touch, rather than as temperature or pain, depends on ________. A) processing in the thalamus B) the type of lower motor neurons involved C) the first-order neurons that integrate the information at the spinal cord D) whether or not the axons decussate a second time within the cerebellum E) the number of sensory receptors the affected region contains in the primary sensory cortex 24. The corticospinal tracts that synapse on motor neurons in the anterior gray horns of the spinal cord are visible as they descend along the ventral surface of the medulla as a pair of thick bands, the ________. A) olives B) reticular formation C) pyramids D) medial lemniscus E) peduncles 26. Several centers (and their associated motor tracts) in the cerebrum, diencephalon, and brainstem, which may issue somatic motor commands as a result of processing performed at a subconscious level, were long known as the ________, but is actually now considered inaccurate and misleading. A) medial lemniscus B) pyramidal system C) anterolateral system D) reticular formation E) extrapyramidal system 31. All the levels of somatic motor control affect the activity of (the) ________. A) thalamus B) third-order neurons C) lower motor neurons D) medulla oblongata E) upper motor neurons
12. Second order neurons of both the specific and nonspecific ascending pathways terminate in the: A. spinal cord. B. medulla. C. thalamus. D. somatosensory cortex.
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