Spinal Tracts Summary Tables.P

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1.Spinothalamic 2.Dorsal Column/Medial Leminscal 3.Spinocerebellar Name Function Origin Ending Location in Cord Spinothalamic Sharp pain, Skin 1st order terminates in Ventral and Tract crude touch and Dorsal Gray Column, Lateral Column temperature 2nd order decussates in spinal cord close to entry level and projects to contralateral VPL nucleus of thalamus, 3rd order projects to sensorimotor cortex Dorsal Fine touch, Skin, 1st order ascends spine Dorsal Column Column/Medial conscious joints, on ipsilateral side and Lemniscal proprioception, tendons terminates in two point brainstem nuclei, 2nd discrimination order decussate and project to the VPL of thalamus, 3rd order neurons project to sensorimotor cortex System Function Origin Ending Location in Cord Spinocerebellar Unconscious Muscle spindle 1st order neurons Lateral Tract proprioception cells, Golgi tendon synapse in spinal Column organs, touch and cord, 2nd order pressure receptors neurons ascend on the ipsilateral side and project to the cerebellar cortex 1.Corticospinal 2.Extrapyramidal System Function Origin Ending Location in Cord Lateral Fine motor Motor and pre- Motor neurons Lateral column Corticospinal function (distal motor cortex of ventral grey Decussates in Tract musculature) column pyramids of medulla Anterior Gross and Motor and pre- Motor neurons Anterior column Corticospinal postural motor motor cortex of ventral grey Decussates after Tract function column the fibres has (proximal and descended axial musculature) System Function Origin Ending Location in Cord Rubrospinal Fine motor Red nucleus Motor neurons Lateral column Tract control of upper of upper limb limb flexors flexors Vestibulospinal Maintenance of Lateral and Motor neurons Anterior column Tract posture medial of axial vestibular musculature nucleus and limb extensors Reticulospinal Co-ordination of Reticular Motor neurons Anterior column Tract extensor motor formation of axial neuron activity musculature for locomotion and limb and postural extensors control Tectospinal Coordination of Midbrain Motor neurons Anterior column Tract head and eye controlling head movements movement 1.Syringomyelia 2.Brown-Sequard Syndrome 3.Sub Acute Combined Degeneration Condition Pathology Tracts Involved Signs/Symptoms Syringomyelia Cyst or cavity around Spinothalamic Tract Loss of pain and central cord temperature sensation Brown-Sequard Hemisection of the Spinothalamic tract, Contralateral loss of Syndrome spinal cord Dorsal Column, pain and Corticospinal tract temperature, ipsilateral loss of joint position sense, ipsilateral UMN signs Sub Acute Combined Vitamin B12 Dorsal Column, Bilateral loss of Degeneration deficiency Corticospinal tract, vibration and joint Spinocerebellar tract position sense, bilateral UMN signs and ataxia.

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Spinal Tracts.Pdf
Spinal Tracts Andreas Talgø Lie Illustrations by: Peder Olai Skjeflo Holman Previous material: Maja Solbakken Definitions to bring home Nerve Ganglion Neuron Nucleus Tract Collection neurons Collection of nerve A single cell Collection of Collection of axons that transmits cell bodies in the transmitting nerve cell bodies in traveling up or sensation or motor PNS, typically linked electrical impluses. the CNS, typically down the spinal impulses depending by synapses. linked by synapses. cord, depending on the function and Location: both on function destination. Location: PNS Location: CNS and destination. Location: PNS Location: CNS - does it matter? Tract - highway to pass anatomy exam? • Highway = Tract • Lane = Neuron • Car = Signal Slow... Fast!! Just to make sure... • Ipsilateral or contralateral • Ventral = anterior • Dorsal = posterior High yield points to understand • What does the tract transmit - Motor or sensory? If sensory: which sensation? • Where does the neurones synapse - 1.st, 2nd and 3rd order neron? Which ganglion/nuclei? • Where there are decussations - If there are any decussations at all? ASCENDING / SENSORY TRACTS Sensations * Temperature NOT transmitted by the tracts: * Pressure * Visualization * Pain * Audition * Fine touch * Olfaction * Crude touch * Gustation * Proprioception * Vibration Sensations Precise sensation Primitive sensation Fine touch Crude touch Pressure Pain Vibration Temperature Proprioception Other: sexual, itching, tickling Ascending tracts / Sensory tracts Dorsal coulmn Lat. Spinothalamic Ant.
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Basal Ganglia & Cerebellum
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The Brain Stem Medulla Oblongata
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Interneuronal Activity in Reflex Pathways from Group II Muscle Afferents Is Monitored by Dorsal Spinocerebellar Tract Neurons in the Cat
The Journal of Neuroscience, April 2, 2008 • 28(14):3615–3622 • 3615 Behavioral/Systems/Cognitive Interneuronal Activity in Reflex Pathways from Group II Muscle Afferents Is Monitored by Dorsal Spinocerebellar Tract Neurons in the Cat Elzbieta Jankowska and Anna Puczynska Department of Physiology, Sahlgrenska Academy, Go¨teborg University, 405 30 Go¨teborg, Sweden The main aim of the study was to investigate whether group II muscle afferents contribute to the inhibition of dorsal spinocerebellar tract (DSCT) neurons and thereby modulate information provided by these neurons in the cat. In intracellular recordings, we found disynaptic IPSPs from group II afferents in the majority of DSCT neurons, most often in parallel with IPSPs evoked from group I afferents. In an attempt to identify interneurons that mediate these IPSPs, the second aim of the study, laminas IV–VII in midlumbar segments were searched for interneurons antidromically activated by stimuli applied within Clarke’s column. Such interneurons were found in regions in which focal field potentials were evoked by group I and II afferents, or ventral to them, and most were coexcited by these afferents. The input to these interneurons and their location indicate that they belonged to the previously identified population of premotor interneu- rons in disynaptic pathways between group I and II afferents and hindlimb motoneurons. The study leads thus to the conclusion that inhibitory actions of group II afferents on DSCT neurons are collateral to actions on motoneurons and that DSCT neurons monitor inhibitory actions of group II afferents on motoneurons as closely as they monitor actions of group I afferents.
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The Nervous System: Sensory and Motor Tracts of the Spinal Cord
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p CHAPTER 10 How Does the Brain Produce Movement? The Hierarchical Control The Basal Ganglia and of Movement the Cerebellum The Forebrain and Movement Initiation The Basal Ganglia and Movement Force The Brainstem and Species-Typical Movement Focus on Disorders: Tourette’s Syndrome Focus on Disorders: Autism The Cerebellum and Movement Skill The Spinal Cord and Movement Execution Focus on Disorders: Paraplegia The Organization of the Somatosensory System The Organization of the Somatosensory Receptors and Sensory Perception Motor System Dorsal-Root Ganglion Neurons The Motor Cortex The Somatosensory Pathways to the Brain The Corticospinal Tracts Spinal-Cord Responses to Somatosensory Input The Motor Neurons The Vestibular System and Balance The Control of Muscles Exploring the Somatosensory The Motor Cortex and Skilled System Movements The Somatosensory Homunculus Investigating Neural Control of Skilled Movements The Effects of Damage to the Somatosensory Cortex The Control of Skilled Movements in Other Species The Somatosensory Cortex and Complex How Motor Cortex Damage Affects Skilled Movement Movements Kevork Djansezian/AP Photo Micrograph: Dr. David Scott/Phototake 354 I p amala is a female Indian elephant that lives at the In one way, however, Kamala uses this versatile trunk zoo in Calgary, Canada. Her trunk, which is really very unusually for an elephant (Onodera & Hicks, 1999). K just a greatly extended upper lip and nose, con- She is one of only a few elephants in the world that paints sists of about 2000 fused muscles. A pair of nostrils runs its with its trunk (Figure 10-1). Like many artists, she paints length and ﬁngerlike projections are located at its tip.
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A First Step Towards Understanding the Role of the Cerebellum in the Control of Movements Is to Determine the Nature of the Information Forwarded to It
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Corticospinal Tract (CST) Reconstruction Based on Fiber
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Cerebellum(Small Brain)
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The Properties of Dorseal Spinocerebellar Tract
PLEASE TYPE THE UNIVERSITY OF NEW SOUTH WALES Thesis/Project Report Sheet Surname or Family name: RAKIC First name: Severin Other name/s: Abbreviation for degree as given in the University calendar: M.Sc school: School of Medical Sciences Faculty: Medicine Title: The Properties of Dorsal Spinocerebellar Tract Neurones and their Role in Signalling Tactile Information from the Skin to the Cerebellum Abstract 350 words maximum: (PLEASE TYPE) The dorsal spinocerebellar tract (DSCT) appears to be the major pathway conveying kinaesthetic and tactile information from the hindlimb to the cerebellum. The aim of the present study was to investigate quantitatively the capacity of dorsal spinocerebellar tract (DSCT) neurones to signal static and dynamic tactile information to the cerebellum. The analysis, conducted in anaesthetised cats, was based on extracellular recording , in Clarke's column and the adjacent dorsal horn of the lumbar spinal cord, from single DSCT neurones activated by tactile inputs from the hairy skin of the ipsilateral hindlimb. Each neurone studied quantitatively was first identified as a DSCT neurone using an antidromic collision procedure and the receptive field carefully mapped. Static tactile stimuli of graded intensities of skin indentation (up to 1500 IJm) , and dynamic tactile stimuli in the form of sinusoidal vibration were delivered to the most sensitive point in the individual neurone's .receptive field. A small minority (<15%) of sampled DSCT neurones displayed a slowly adapting or static tactile sensitivity, and had rather coarsely-graded stimulus-response relations as a function of graded increases in the amplitude of skin indentation. The vast majority of the DSCT neurones sampled (>85% of neurones) was sensitive to just the dynamic components of tactile stimuli.
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