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Somatosensory System - Coggle Diagram
Somatosensory System
Nerve Fibre Types
Aα
Αδ
Αβ
C
Components
Sensory receptors - Modalities
Mechanoreceptors
Thermoreceptors
Nociceptors
Stretch receptor
Axonal Ascending pathways
Somatosensory cortex
Receptors
Adaptation
Phasic
Pressure touch
Rapidly adapting
Off response
Tonic
Slowly adapting
Pain, proprioception
Continued response to stimulus
Receptor Modalities
Mechanoreceptors
Pacinian corpsule
Vibration
Mesissner's
Fine touch
Ruffini
Slow
Thermoreceptor : temperature
Stretch receptor: Proprioception
Nociceptor: Pain
Receptor Transduction
Graded potentials
Action potentials
Receptor Potentials
Generator potentials
Ascending Axonal Pathways
Neurons
3rd Order Afferent
Thalamus
Conveys infor to primary somatosensory cortex in parietal lobe
2nd Order Afferent
Spinal cord
Synapses with 3rd in thalamus
1st Order Neuron
Peripheral sensory ganglion
Enters spinal cord through dorsal root
Synapses with 2nd order in spinal cord or medulla
Lateral inhibition
Highlights edges of stimulus - Increases touch discrimination
Ascending Pathways
Dorsal column-medal lemniscal pathway
Touch, Proprioception
Spinothalamic pathways
Pain, Tamperature
Trigeminothalamic
Sensory info of face
Stimulus
A change detectable by receptors at the peripheral ending of afferent neurons
Stimulus Distinction
Type (modality)
Type of receptor activated / Pathway
Location
Location of activated receptive field
Intensity
Frequency of action potentials / Number of activated receptors
Primary Somatosensory cortex
S1 Postcentral gyrus
Somatosensory Representation
Somatotopic map
