What is the best physiological explanation as to why a particular area has a low two-point threshold?A greater skin surface area always results in a lower two-point threshold because there is physically more room in which to housesensory receptors.With a low two-point threshold, there is a greater density of sensory receptors to allow for more precise location of the sensationby the somatosensory cortex.O A low threshold suggests a decreased sensation in that area, meaning a wide receptive field on that area of skin.

One of the most often utilized neurosensory examinations in healthcare situations to examine…

Answered: What is the best physiological…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter6: The Peripheral Nervous System: Afferent Division; Special Senses

Section: Chapter Questions

Problem 13RE

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Based upon stimulus origin, would a cutaneous pain receptor beclassified as an exteroceptor, an interoceptor, or a proprioceptor?Based upon receptor distribution, would this same cutaneousreceptor be classified as a general somatic, general visceral, orspecial sense? Finally, how would this pain receptor in the skinbe classified based upon modality of stimulus?
Which is true regarding somatotopic organization? Select one: a. Certain areas of the body have much higher representation in the primary somatosensory cortex than other areas, and these regions will have finer tactile discrimination. b. The representation of a given area of the body in the primary somatosensory cortex is directly proportional to the size of that body area (e.g., the right index finger has less representation than the right thigh). c. The receptive fields for somatosensory neurons are circular and relatively consistent in size across areas of the body, but areas of the body with the finest tactile discrimination have many more neurons representing them in the primary somatosensory cortex. d. There is equal representation of all areas of the body in the primary somatosensory cortex
Nociceptors are pain receptors that respond to noxious stimuli, and send AP's to both the spinal cord and the brain. What type of stimuli activate nociceptor neurons?
The suprachiasmatic nucleus receives direct input from the retina and enables light dark circles to entrain circadian rhythms. What is the effect on a persons circadian rhythms of sleeping and waking if the retinal axons were somehow disrupted?
What does your map of cutaneous sensations tell you about the distribution of sensory receptors in the skin?
Which of the following structures does not receive direct input from retinal ganglion cells? a. Primary visual cortex b. The suprachiasmiatic nucleus (SCN) in the hypothalamus c. The superior colliculus in the tectum d. The lateral geniculate nucleus (LGN) in the thalamus The Glossopharyngeal nerve (cranial nerve IX) is a “mixed nerve,” meaning that it carries sensory and motor information. One of the functions of this nerve is carrying taste information from the caudal third of the tongue. The fibers that carry this information in the glossopharyngeal nerve are classified as which component type? a. Special efferent b. Special afferent c. General visceral efferent d. General somatic afferent
What studies of visual agnosia tell us about the occipitotemporal cortex in object perception and recognition? a. Functional localization in specific areas b. Functional integration between areas c. Functional heterogeneity across areas d. Integrative neophrenology e. Fractional phrenology
Enkephalin blocks pain transmission by :-a- blocking the response of pain receptors to painful stimulib- slowing down transmission of pain impulses through synapses in the pain pathwayc- inhibiting the response of the cerebral cortical somatic sensory area to pain signalsd- blocking Ca ++ channels in the central terminals of pain sensory fibers
Touch receptors in the skin surface are ipsilateral to the side of the somatosensory cortex on which their input is processed A.True B.False
In the process of sensory coding Recruitment of additional neurons occurs with a weak stimulus in order to make the stimulus stronger. The larger the receptive field of a sensory receptor, the greater the expected acuity and the more accurate the two-point discrimination. Lateral inhibition of neighboring receptors resulting in a relative reduction of action potentials in the neighboring second order neurons would be expected to increase acuity. A receptor potential that remains suprathreshold into the absolute refractory period will result in additional action potentials.
All sensory organs relay information through the thalamus but not in the same way. How does the pathways of information from sensory organs to the primary sensory vortices and organization differ between the 3 systems? How are they the same? You may focus on one of the somatosensory pathways (touch or pain/ temp)
Select the statement that explains the neural mechanism underlying the sensation of fast, sharp pain followed by delayed, longer-lasting pain after an injury. a. Fast pain is conducted by mechanoreceptors, whereas delayed pain is conducted by fibers with free nerve endings. b. Fast pain is conducted by free nerve endings in the dermis, whereas delayed pain is conducted by deep nerve endings in the subcutaneous layer. c. The receptive fields differ for the two types of pain sensation such that fast pain fibers have smaller receptive fields than the delayed pain fibers. d. Fast and delayed pain represent the progression of the injury; both are conducted by the same fibers. e. Fast, sharp pain is conducted by myelinated axons, whereas delayed, longer-lasting pain is carried by unmyelinated axons.

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