GSA: General Sensory Afferents - Systems of the Spinal Cord and Trigeminal System Flashcards
Ways that the nervous system receives input about the external environment is called?
Exteroception (GSA)
Ways that the nervous system receives input about the internal environment is called?
Interoception (GVA)
Ways that the nervous system receives input about the position and movement of the body in space is called?
Proprioception
GVA stands for?
General Visceral Afferents
GSA stands for?
General Sensory Afferents
What are the two general sensory systems?
GVA and GSA
GVA is sensory from the __________ nervous system.
Autonomic
GSA is sensory from what?
Skin and Skeletal muscles
What does the GSA sense?
Touch
Pain
Temp
Position of body
What are the 5 types of sensory receptors?
Mechanoreceptors Thermoreceptors Nociceptor Photoreceptors Chemoreceptors
What stimulus do Mechanoreceptors best respond to?
Physical deformation
What stimulus do Thermoreceptors best respond to?
Heat and Cold
What stimulus do Nociceptors best respond to?
Noxious stimuli
What stimulus do Photoreceptors best respond to?
Vision
What stimulus do Chemoreceptors best respond to?
Chemical changes like taste, smell, O2 and CO2 in blood
What are the 4 afferent neuron destinations?
Cortex
Cerebellum
Individual Spinal Cord Segments
ARAS
What is divergence of afferent information?
The same sensory information is sent
to multiple destinations for different purposes
What is parallel processing of afferent information?
Different aspects of the same
sensory experience are perceived in different parts
of the brain at the same time.
Divergence happens so that _____ ______ can occur.
parallel processing
An action potential in a primary neuron goes from where to where?
From periphery to CNS
In what structure do axons ascend to the brain?
In fiber tracts
How are somatosensory fiber tracts named?
Prefix: Named for the origin of the tract
Suffix: Named for the termination of the tract
“spinothalamic” or “ “vestibulospinal”
Where would you find peripheral receptors?
On primary afferent neurons
Where does relay and processing of all sensory information destined for CONSCIOUS perception occur?
From thalamus to cortex
Where do somatosensory inputs go to?
CONTRALATERAL thalamus and cortex
Primary afferents are also known as ________ neurons and converge on ______ order neuron.
excitatory; 2nd order neuron
What surrounds the receptive field of excitatory neurons? What does this help determine?
Inhibitory neurons
Helps determine where the stimulus is (excitatory) and isn’t (inhibitory)
What is somatotopy?
the point-for-point correspondence of an area of the body to a specific point on the central nervous system.
The areas which are finely controlled (e.g., the digits) have larger portions of the somatosensory cortex
