Univ. of Illinois, Urbana-Champaign Bio/Neuro 303 Chapter 14 - Study Questions *** LAST UPDATED 05 October 2002 *** 190. In the mammalian somatosensory system, sensory information about touch, vibration, and kinesthesis, travels to the brain via the a. spinothalamic pathway. *b. lemniscal pathway. c. vestibulospinal tract. d. none of the above tracts. 191. The macula is a. the part of the semicircular canals of a vertebrate inner ear in which the receptor cells are located. b. the part of the cochlea in which the receptor cells are located. c. the collective term for all the receptor cells in the vestibular apparatus, including the semicircular canals. *d. the part of a vertebrate internal ear in which the receptor cells that respond to gravity and to linear movements of the head are located. 192. The somatosensory system in mammals includes receptors for detecting a. touch. b. temperature. c. pain. *d. all of the above. 193. Temperature receptors are part of the a. visual system. b. auditory system. *c. somatosensory system. d. chemosensory system. 194. The somatosensory cortex in mammals has a columnar arrangement. This statement is *a. true, since separate groups of cortical neurons that respond to pain, temperature, pressure and other somatic stimuli, are arranged in vertical columns in the cortex. b. true, since morphologically separate columns of neurons can be seen in histological sections of the cortex, although there is no FUNCTIONAL columnar organization. c. false, since the cortex cannot have a columnar arrangement at the same time it is topographically organized. d. false, since of all the sensory cortical areas, the visual cortex is the only one with a columnar arrangement. 195. Tuberous receptor organs are a. mechanoreceptors of the lateral line system of fish. b. electroreceptors that are specialized to respond to weak, low-frequency electrical fields, and hence are found mainly in fish with a passive electric sense. *c. electroreceptors that are specialized to respond to high-frequency electrical fields, and hence are found only in fish with an active electric sense. d. mechanoreceptors of the lateral line system of amphibians. 196. There is good evidence in support of a true magnetic sense in bees, in spite of *a. the lack of clear identification of the sense organ involved. b. the fact that bees are too stupid to navigate via a magnetic sense. c. the interference of a magnetic sense with the nectar-finding ability of bees. d. the ability of bees to navigate by seeing polarized light.