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Sensory systems

Sensory systems. Dr. Altdorfer. Sensory systems. Epicritic Protopathic Proprioceptive. FINE AND DISCRIMINITIVE TOUCH I. neuron: DRGgl. gracile + cuneate fascicle II. neuron: gracile and cuneate nucleus internal arcuate fibers X MEDIAL LEMNISCUS III. neuron: VPL (contralateral)

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Sensory systems

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  1. Sensory systems Dr. Altdorfer

  2. Sensorysystems Epicritic Protopathic Proprioceptive

  3. FINE AND DISCRIMINITIVE TOUCH I. neuron: DRGgl. gracile + cuneate fascicle II. neuron: gracile and cuneate nucleus internal arcuate fibers X MEDIAL LEMNISCUS III. neuron: VPL (contralateral) sup. thalamic radiation SOMATOSENSORY CORTEX (postcentral gyrus – Br 3,1,2)

  4. Receptors:of touch - Meissner corpuscles of vibration – Paccinian corpuscles of proprioception – muscle spindles, Golgi tendon organs nerve endings in joint capsule and ligaments EPICRITIC SENSIBILITY

  5. Thalamic radiations to somatosens. cortex

  6. SOMATOTOPY

  7. CORTICAL REPRESENTATION Homunculus…

  8. Sensory systems Epicritic Protopathic Proprioceptive

  9. SPINOTHALAMIC TRACT – Anterolateral system PROTOPATHIC SENSIBILITY - pain, touch, temperature • receptors in the skin: mechano-, thermo- and nociceptors • 1. neuron: DRG ortrigeminal ganglion • 2. neuron: in the dorsal horn of the spinal cord or in the spinal trigeminal nucleus (in pain sensation also the 3. neuron ) X • 3. neuron: thalamus VPL or VPM somatosensy cortex – postcentral gyrus

  10. SPINOTHALAMIC TRACT Dr. Kozsurek

  11. Tegmentum of brainstem Pain, temperature Rough touch+pressure

  12. Trigeminal lemniscus

  13. Sensory nuclei of trigeminal nerve: Mesencephalic nucl.: proprioceptive - pseudounipolar neurons! Principal sensory nucl.: /pontine nucl./: epicritic Spinal trig. nucl.: prothopathic

  14. Comparison

  15. PAIN SENSATION –spino-reticulo-thalamic tract Pain-feeling --- functions emotional, affective and behavioural answers for pain sensation - receptors are in the skin/mucosa - nociceptors - I. neuron: DRG or trigeminal ganglion - II-III. neurons: spinal cord or spinal trigeminal nucleus • further neurons : reticular formation, thalamus VPL/VPM somatosensory cortex • but also CM /intralaminar nuclei  MD frontal cortex (through ant. thalamic radiation) • limbic cortical areas: cingular, insular cortex

  16. Thalamic radiations to somatosens. cortex

  17. „Painkillers”

  18. Syringomyelia C, Th segments of spinal cord: cavity, destroys the nearby tracts: e.g. the fibres in the ant. white commissure, coming from upper limb (pain, temperature) -- Mucius Scaevola).

  19. Melzack and Wall: "Gate Control Theory" (1965)

  20. Substance P

  21. Sensory systems Epicritic Protopathic Proprioceptive

  22. Brown-Séquard syndrome

  23. Images: Dr. Gallatz, Dr. Kozsurek, Dr. Székely

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