exam Version _1 2.2 451 2008

Exam Version_1 2.2 - 1 In the somatosensory system a All information from the skin ascends in the dorsal column-medial lemniscal system b All

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1. In the somatosensory system a. All information from the skin ascends in the dorsal column-medial lemniscal system. b. All information from deeper tissue travels in the anterolateral system. c. Touch information is carried by the largest diameter fibers innervating the skin. d. Any spot on the skin can give rise to the sensation of cool if the stimulus is cold enough. e. Thermoreceptors (fibers for temperature) are excited by warm stimuli and inhibited by cold stimuli. 2. Shingles a. is caused by viral infection of the substantia nigra. b. is caused by viral infection of the dorsal root ganglia. c. is progressive and fatal. d. causes selective loss of pain and temperature information. e. always occurs after onset of Parkinson’s disease. 3. Referred pain a. is one of the chronic pain syndromes. b. may be mediated by convergence of information onto cells in the dorsal horn. c. is mediated by enkephalin interneurons in the spinal cord dorsal horn. d. is very difficult to treat. e. frequently occurs after amputations of the leg. 4. All motoneurons innervating a single muscle a. are of the same type, alpha or gamma. b. are all of the same size, but that size varies for different muscles. c. are called the motoneuron pool. d innervate the same number of muscle fibers. e. have cell bodies in the dorsal root ganglion. 5. Muscle spindles
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a. are composed of two types of intrafusal fibers, nuclear bag and nuclear chain fibers. b. are found only in flexors and not extensors. c. are composed of two types of extrafusal fiber, the S and the FF
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This note was uploaded on 11/10/2010 for the course PGY Phisiology taught by Professor Dr.beizer during the Spring '10 term at SUNY Buffalo.

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Exam Version_1 2.2 - 1 In the somatosensory system a All information from the skin ascends in the dorsal column-medial lemniscal system b All

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