29 Questions
What is the primary function of the somatic nervous system?
To control the movements of the musculoskeletal system
How does the autonomic nervous system differ from the somatic nervous system?
The autonomic system produces reflex activations and works involuntarily, while the somatic system works voluntarily
Which of the following is considered a special sense?
Vision
Where are the receptors for touch, pressure, proprioception, and pain located?
Throughout the skin and underlying tissue
What is the primary function of the special senses?
To process sensory information from the external environment
What is the purpose of the somatosensory system's receptors?
To provide awareness of activity in the surrounding area and allow appropriate or protective actions to be taken
Which type of receptor is stimulated by chemicals in the blood?
Chemoreceptor
Which type of mechanoreceptor is sensitive to light touch in glabrous skin?
Meissner's corpuscles
What is the function of Ruffini endings?
Sense continuous deformation, such as heavy touch or pressure
Which type of mechanoreceptor is stimulated by rapid movement on the skin?
Pacinian corpuscles
Which type of receptor is stimulated by light?
Photoreceptor
What is the function of free nerve endings?
Respond to pain, touch, pressure, and thermal stimuli
What type of sensory receptors are Hair Follicle Receptors?
Phasic receptors
What constitutes a 'sensory unit'?
A single sensory axon and its peripheral branches
What is the 'receptive field' in the context of sensory receptors?
The area where a stimulus produces a sensory effect in the clusters of neighboring receptors
What determines the intensity of a stimulus according to the text?
Both the frequency of impulse transmission and the number of receptors involved
What affects the senses according to the 'Law of Specific Energies' mentioned in the text?
The type of sensation (modality) does not change as intensity increases
What determines the ability to discriminate between two separate stimuli applied together?
Both the distance between the stimuli and the type of sensory receptors involved
Which type of sensory fibers enter the spinal cord via dorsal roots?
Somatic and part of autonomic
Where are the cell bodies of somatic afferents located?
Spinal ganglion
What do lesions in the Dorsal Column-Medial Lemniscal System cause?
Disorders of balance
Which receptors are associated with the Dorsal Column-Medial Lemniscus System for proprioception and fine touch?
Muscle spindles, Golgi tendon organs, Ruffini Endings
Where do the afferents of the Dorsal Column - Medial Lemniscus System travel in the spinal cord?
Dorsal horn
Which area in the brain contains the third neurons related to the Dorsal Column-Medial Lemniscal System?
Ventral posterolateral nucleus of Thalamus
What percentage of sensory inputs that enter the central nervous system are eliminated?
99%
Which type of receptor detects distant senses such as light and sound?
Teleceptors
What is the function of receptors?
Both a and b
What type of receptors perceive stimuli from the body's internal environment?
Interoceptors
What happens when a receptor potential reaches a threshold voltage?
The receptor potential is converted into an action potential in the sensory axon
Explore the functions of the somatosensory system, focusing on the somatic nervous system and its control over movements of musculoskeletal organs. Learn about how the somatic nervous system activates in response to the body's needs and works mostly voluntarily.
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