SENSORY PATHWAYS DR KATALIN GALLATZ SENSORY PATHWAYS Spinothalamic

SENSORY PATHWAYS DR. KATALIN GALLATZ

SENSORY PATHWAYS Spinothalamic system is for the pain temperature and light touch protopathic sensibility Medial lemniscus is for fine and discrimitive touch, vibration and propriocepcion epicritic sensibility In contrast of the spinothalamic system, in which fibers cross at the spinal level, the fibers that costitute the medial lemniscus system ascend ipsilaterally in the dorsal funiculus and cross in the caudal medulla

PROTOPATHIC SENSIBILITY: TEMPERATURE, TOUCH, PAIN ANTEROLATERAL SYSTEM – spinothalamic tract EPICRITIC SENSIBILITY: FINE AND DISCRIMINITIVE TOUCH DORSAL COLUMN SYSTEM– medial lemniscus

PRIMARY AFFERENTS

EPICRITIC SENSYBILITY RECEPTORS: OF THE TOUCH - MEISSNER CORPUSCLES OF VIBRATION – PACCINIAN CORPUSCLES OF PROPRIOCEPTION – MUSCLE SPINDLES, TENDON SPINDLES, GOLGI TENDON ORGANS NERVE ENDINGS IN AND NEAR TO THE CAPSULES AND LIGAMENTS OF THE JOINTS

EPIKRITIC AND PROPRIOCEPTIVE PATHWAYS GOLL BURDACH GRACl. LE FASCICLE (Goll) medially, from the lower limb CUNEATE FASCICLE (Burdach) laterally, from the upper limb Dorsal and ventral spinocerbellar tract Dr. Kozsurek Márk anyagából From Dr. Mark Kozsurek

MEDIAL LEMNISCUS – EPICRITIC SENSIBILITY FINE AND DISCRIMINITIVE TOUCH I. neuron: spinal ggl/ ggl. trigeminale gracile és cuneate fascicle II. neuron: gracile and cuneate nucleus internal arcuate fibers X MEDIAL LEMNISCUS III. neuron: VPL (contralateral) SOMATOSENSORY CORTEX

MEDIAL LEMNISCUS – EPICRITIC SENSIBILITY 1. neuron: spinal ( dorsal root) ganglion the central processes of the ganglion cells enter the spinal cord through the spinal root and ascend in the gracile and cuneate fascicles to the caudal medulla 2. neuron: gracile and cuneate nucleus the axons of these neurons - the internal arcuate fibers cross in the midline - lemniscal deccusation, and ascend as medial lemniscus to the thalamus 3. neuron: ventral posterolateral (VPL) nucleus of the thalamus the axons of these neurons ascend through the internal capsule to the postcentral gyrus - primary somatosensory cortex

MEDIAL LEMNISCUS – EPICRITIC SENSIBILITY

SOMATOTOPY IN THE SPINAL CORD

SENSORY PATHWAYS SPINOTHALAMIC TRACT – PROTOPATHIC: TEMPRETURE, PAIN, TOUCH Dr. Kozsurek Márk anyagából

SPINOTHALAMIC TRACT – PROTOPATHIC SENSYBILITY - pain, touch, temperature - receptors in the skin: mechano, - termo, and nociceptors -1. neuron: spinal ganglion or trigeminal ganglion -2. neuron: in the dorsal horn of the spinal cord or in the spinal trigeminal nucleus. (in pain sensation also the 3. neuron) - 3. neuron: thalamus VPL or VPM somatosensy cortex – postcentral gyrus

PAIN SENSATION - spinoreticulothalamic tract PAIN FEELING It has function in emotional, affective and behavioural answers for pain sensation - receptors are in the skin - nociceptors - I. neuron: spinal ganglion or trigeminal ganglion - II-III. neuron in spinal cord or spinal trigeminal nucleus - further neurons : reticular formation, thalamus CM and - frontal cortex intralaminar nuclei - limbic cortical areas: cingular, insular cortex

SZOMATOSENSORY PATHWAYS CONNECTING WITH THE PAIN SENSATION functional activity ------------localization and pathways -------------Spinothalamic tract termination ---------thalamus (VPL), discrimination Ventral trigeminothalamic tract (ventral trigeminal lemniscus) VPM primary and secondary sensory cortex (SI, SII) Pain-feeling Spinoreticulothalamic tract RF) intralaminar nuclei of th. It has function in emotional, reticular formaton affective and behavioural limbic cortical areas answers for pain sensation

MEDIAL LEMNISCUS epicritic sensibility 2. neuron and crossing in the medulla SPINOTHALAMIC TRACT protopathic sensibility 2. neuron and crossing in the spinal cord

NUCLEI OF THE TRIGEMINAL NERVE MESENCEPHALIC NUCLEUS PRINCIPAL SENSORY NUCLEUS SPINAL TRIGEMINAL NUCLEUS

TRIGEMINAL SENSORY PATHWAYS DORSAL TRIGEMINAL LEMNISCUS

VENTRAL TRIGEMINOTHALAMIC TRACT. TRIGEMINAL LEMNISCUS TRIGEMINAL GANGLION SPINAL TRIGEMINAL TRACT SPINAL TRIGEMINAL NUCL. X Contralateral VPM POSTCENTRAL GYRUS

TRIGEMINAL SENSORY PATHWAYS

TRIGEMINAL SENSORY PATHWAYS DORSAL TRIGEMINOTHALAMIC TRACT DORSAL TRIGEMINAL LEMNISCUS epicritic sensibility trigeminal ganglion principal sensory nucleus of V. VPM postcentral gyrus

SOMATOTOPY

SOMATOSENSORY CORTEX THALAMUS

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