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Neuro-Sens. Pathways

Somatosensory Pathways

Modalities Touch, propioception, pain, temperature and vibration
5 purposes of Somatosensory System 1. Recognize objects by touch 2. Manipulate objects with accuracy 3. Monitor and control movement 4. Sense and prevent damage 5. Provide efficiency and flexibility in movement
3 Components of Skilled Movement 1. Efficiency 2. Flexibility 3. Accuracy
Efficiency Being able to accomplish a task without focusing all attention on that task
Flexibility Being able to sense differences and changes in the environment
Accuracy Completing the task correctly
The AP generated by mechanosensory stimuli are transmitted to teh spinal cord by afferent sensory neurons that travel in ____________ peripheral nerves
All modalities are carried by the ___________ peripheral nerve same
Large myelinated axons innervate low-threshold mechanoreceptors from large ganglion cells
Small axons innervate high-threshold receptors (pain/temp) from smaller ganglion cells
DC-ML 1st Order Neurons Large and myelinated
Anterolateral (spinothalamic) 1st Order Neurons small, unmyelinated or thinly myelinated or myelinated
Spinocerebellar 1st Order Neurons Large and myelinated
DC-ML Carries fine touch discrimination, active touch, joint position (propioception) and vibration
DC-ML ascends ipsilaterally in teh dorsal columns
Gracile tract more medial, represents lower extremity touch, propioception and vibration
Cunate tract more lateral, represents trunk, UE and neck touch, propioception and vibration
DC-ML 1st Order Neurons project to Medulla
DC-ML first order neurons synapse with the 2nd Order Neurons in the Gracile and cuneate nuclei
DC-ML 2nd Order Neurons Form internal arcuate tract
Internal arcuate axons (DC-ML 2nd order) decussate in the ___________ caudal medulla
DC-ML 2nd order neurons synapse with 3rd order in _________ VPL
DC-ML axons from VPL project to ______ somatosensory cortex (layer IV)
Location of primary somatosensory cortex (SI) postcentral gyrus of parietal lob
Brodmann's areas included in SI 3a, 3b, 1 and 2
3a propioception
3b and 1 cutaneous stimuli
2 propioception and cutaneous stimuli
Somatosensory information projects from S1 to ______________ and ____________ higher-order cortical fields, subcortical structures
Higher order cortical regions that S1 projects to S2, amygdala, hippocampus, and motor control areas
S1 descending pathways may modulate ascending sensory information
Spinothalamic tract carries: Pain, temperature and crude touch
Spinothalamic tract 1st order neurons synapse with 2nd order in the _________ ipsilateral dorsal hord of the spinal cord
Spinothalamic 2nd order neurons decussate _____ at the level of entry into the spinal cord
The spinothalmic tract 2nd order neurons ascend in the anterolateral quadrant of the contralateral spinal cord
Spinothalmic tract 2nd order neuron synapses on the VPL through both direct and indirect paths
Spinothalamic 3rd order nerves terminate in S1
Brown-Sequard Syndrome A hemisection of the spinal cord that resutls in loss of pain, temperature and crude touch on the contralateral side and loss of fine descrimination, active touch, propioception and vibration on the ipsilateral side
Dermatomes area of skin innervated b the nerve fibers comprising a dorsal root
Trigeminal Somatic Sensory System conveys somatosensory information from the face
1st order neurons for Trigeminal somatic sensory system Trigeminal nerver (cranial nerve V)
Trigeminal nerve enters brain at _________-- the level of the pons
Trigeminal nerve synapses on the trigeminal brainstem complex
Two major components of the trigeminal brainstem complex Principal nucleus and Spinal nucleus
Analogous to DCML for face (carries tactile and propioceptive stimuli) principal nucleus of trigeminal system
Analogous to Spinothalamic for face (painful and thermal stimuli) Spinal nucleus of trigeminal system
Trigeminal 2nd order neurons deccussate in the ___- pons
Trigeminal 2nd order neurons terminate on VML
Trigeminal 3rd order neurons project to ) S1 (layer IV
Spinocerebellar pathways carry somatosensory information from the spinal cord to the cerebellum via direct and indirect pathways
Spinocerebellar pathways provide joint and muscle propioception from the body (especially the legs) and different versions of the changing state of the body and its environment for comparison
Spinocerebellar pathway orginates from internneurons in te spinal grey matter
Spinocerebellar pathway nerves terminate as __________- mossy fibers in teh vermis or intermediate cortex of the cerebellum
Ventral spinocerebellar pathway carries internally generated information about the central locomotor rhythm
Dorsal spinocerebellar pathway provides the cerebellar with sensory beedback during evolving movements (propioception)
Dysmetria impaired ability to judge distance or range of movement
Ataxia uncoordinated movement, loss of order of joint motions
Created by: aglade