18 Questions
Which type of nerve fiber is responsible for transmitting the hot sensation?
C fiber
What is the main difference between the adaptation rate of cold and hot sensations?
Hot sensation adapts faster than cold sensation
Which tract is responsible for transmitting the crude-touch sensation?
Ventral spinothalamic tract
Which receptor is responsible for the hair-end organ component of crude-touch sensation?
Hair end organ
What is the main difference in the adaptation rate between the hair end organ and free nerve endings for crude-touch sensation?
Hair end organ adapts faster than free nerve endings
What is the main purpose of touching the subject's skin with test tubes containing cold water at 15°C and hot water at 40°C?
To test the subject's ability to distinguish between hot and cold sensations
What is the receptor involved in point localization and tactile discrimination?
Merkel's discs
Which type of nerve fiber afferent is responsible for fine touch sensation?
A beta
Which part of the nervous system is responsible for processing tactile localization information?
Dorsal column
How is point localization tested?
By applying two points to the skin with a compass
Which test assesses the ability to feel two separate points simultaneously on the skin?
Two-point discrimination test
Which body parts are mentioned as having more accurate tactile localization and discrimination?
Distal parts of the body
Which tract is responsible for transmitting fine touch, vibration, and proprioceptive sensations?
Dorsal column tract
Which condition can cause degeneration and demyelination of the dorsal column tract, leading to sensory deficits?
Tabes dorsalis (syphilis infection)
Which condition is characterized by degeneration of myelinated fibers in the dorsal column, resulting in loss of proprioception, vibration, and tactile discrimination?
Pernicious anemia (vitamin B12 deficiency)
Which syndrome is characterized by a hemisection of the spinal cord, resulting in a specific pattern of sensory and motor deficits?
Brown-Séquard syndrome
Which anatomical structure's lesion can lead to loss of all sensations on the contralateral side of the body?
Internal capsule
Which brain region's lesion can result in loss of sensations at the representative area on the contralateral side of the body?
Parietal cortex
Test your knowledge on dermatomes and fine touch sensations including receptors like meissner corpuscles and merkel's discs, afferent pathways, adaptation rates, and point localization abilities. Explore the procedure for testing tactile localization.
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