physiology of the sensory system · physiology of the sensory system. sensations receptors....
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Physiology of the sensory system
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Sensations receptors
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Two-point discrimination
Number receptors / area
(receptive field of the receptor )
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Smaller the receptive fields, greater the density of receptors.
This relationship allows for greater discrimination in sensory inputs.
Text Fig. 17-3
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Two-point discrimination
Number receptors / area
Pathway arrangement
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Sensations modalities
• 2-point discrimination
• Vibration
• Prorioception
• Crud touch (itch & rub)
• Temperature
• Pain
Posterior Column-Medial
lemniscus
Pathway
(PCML)
Fast Slow
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Sensations modalities
• 2-point discrimination
• Vibration
• Prorioception
• Temperature
• Crud touch (itch & rub)
• Pain
Antero-lateral system (ALS)
Other name: Spinothalamic
pathway
Fast Slow
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Posterior Column-Medial lemniscus
Pathway
(PCML)
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Somatotopic organization of
(PCML)
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PCML Function
• 2-point discrimination
• Vibration
• Prorioception
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PCML Function
• 2-point discrimination
• Vibration
• Prorioception
STEREOGNOSIS
GRAPHESTHESIA
Help in movement and Wight
recognition
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PCML lesion associated
symptoms
• Loss of 2-point discrimination sensation
• loss of Vibration sensation
• Loss Prorioception sensation
ASTEREOGNOSIS / STEREOGNOSIA
AGRAPHESTHESIA
ABAROGNOSIS
SENSORY ATAXIA
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PCML lesion associated
symptoms
• Loss of 2-point discrimination sensation
• loss of Vibration sensation
• Loss Prorioception sensation
ASTEREOGNOSIS / STEREOGNOSIA
AGRAPHESTHESIA
ABAROGNOSIS
SENSORY ATAXIA
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PCML lesion associated
symptoms
• Loss of 2-point discrimination sensation
• loss of Vibration sensation
• Loss Prorioception sensation
ASTEREOGNOSIS / STEREOGNOSIA
AGRAPHESTHESIA
ABAROGNOSIS
SENSORY ATAXIA
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Antero-lateral system (ALS)
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Sensations modalities
• 2-point discrimination
• Vibration
• Prorioception
• Temperature
• Crud touch (itch & rub)
• Pain
Antero-lateral system (ALS)
Other name: Spinothalamic
pathway
Fast Slow
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Text Fig. 18-9
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Syringomyelia and the
ALS
Spinal cord
Hemisection and
the ALS
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Dermatomes
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Dermatomes
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Dermatomes
• Shoulder (C5-C6)
• Hand (C6-C8): 6= thumb the, 7= index finger, 8= small
finger
• Nipple (T4),
• Umbilicus (T10),
• Inguinal region (T12-L1),
• knee (L3, L4),
• The big toe (L4-L5)
• Small toe (S1)
• The genitalia and anus (S4 and S5)
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• Stocking-glove sensory loss
• tabes dorsalis
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Visceral sensory & referred pain
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Visceral sensory & referred pain
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Visceral sensory & referred pain
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Visceral sensory & referred pain
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Referred pain Vs. radiating pain
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Text Fig. 18-7
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Phantom limb
Deafferentation pain
Thalamic syndrom
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deafferentation pain
posterior root entry zone) procedure anterolateral cordotomy Vs
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Syringomyelia
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Midline
C7
C6
C5
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