30 Questions
Which of the following sensory systems is consciously driven and refers to our special senses and somatic senses?
Somatosensory system
Which of the following sensory systems is subconsciously driven and includes stimuli associated with our visceral organs?
Somatosensory system
Which component of the somatosensory system detects mechanical stimuli?
Mechanoreceptors
Which component of the somatosensory system detects painful stimuli?
Nociceptors
Which component of the somatosensory system detects changes in temperature?
Thermoceptors
Which receptors are found in the subcutaneous tissues of the hand and are responsible for discriminating fine surface textures?
Pacinian corpuscles
What percentage of the cutaneous receptors of the hand do Pacinian corpuscles represent?
10-15%
Which receptors provide information about light and steady pressure, and act as slowly-adapting tonic receptors?
Merkel's disks
Where are Ruffini's corpuscles located?
Ligaments and tendons
What do receptive fields of somatosensory neurons provide insight into?
The precise location of a stimulus
Which receptors are responsible for sensing pain and temperature stimuli?
Receptors boxed in red
What is the function of encapsulated receptor endings?
Change the response characteristics of the nerves
What is the role of somatosensory afferent receptors?
Generate an electrical signal in the sensory neuron
What is the difference between slowly adapting and rapidly adapting receptors?
Rapidly adapting receptors fire initially, but become quiescent before the stimulus is removed
Which mechanosensory receptor is specialized to respond to changes in texture?
Meissner’s corpuscles
Which type of receptors are primarily sensitive to temperatures lower than body temperature?
Cold receptors
Which type of receptors are primarily sensitive to temperatures between 37°C to 45°C?
Warm receptors
What type of stimuli do nociceptors respond to?
Mechanical, thermal, and chemical stimuli
What is the main difference between thermoreceptors and nociceptors in terms of their response to temperature changes?
Thermoreceptors respond tonically to temperature changes, while nociceptors respond phasically
Which type of pain perception is sharp and localized?
First pain
Which pathway carries mechanosensory and proprioceptive information from the upper and lower body to the brain?
Dorsal column-medial lemniscus pathway
Where do the sensory roots of the trigeminal nerve enter the brainstem?
Pontine level
Which region of the thalamus receives information from the trigeminal lemniscus pathway carrying pain/temperature and mechanosensory information from the face?
Ventral posterior medial thalamus
Which cortical region is located in the post central gyrus of the parietal lobe and is responsible for processing tactile and proprioceptive stimuli?
Somatosensory cortex
What is the function of the higher cortical centers and association cortices in the somatosensory system?
Integrate sensory information with emotional cues and executive input
Which pathway corresponds to noxious and thermal stimulation of the face?
The trigeminal pain and temperature system
Where do the sensory afferents synapse onto second order neurons in the spinothalamic system?
The dorsal horn of the spinal cord
Where do first order neurons carry sensory information from facial nociceptors and thermoceptors in the trigeminal pain and temperature system?
The brainstem
Where do third order neurons within the ventral posterior medial nucleus send projections to for processing in the trigeminal pain and temperature system?
The primary and secondary somatosensory cortex
Which region allows for affective and executive processing in the pathway that mediates the affective-motivational aspects of pain?
The nuclei of the thalamus
Test your knowledge of mechanosensory and proprioceptive pathways with this quiz. Learn about the differences between coarse movements and precise eye movements and how they are conveyed to the central nervous system.
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