HLSC 2400U Lecture Notes - Lecture 5: Upper Motor Neuron, Medial Lemniscus, Spinocerebellar Tract

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21 Jun 2018
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Final Exam Review
Know tracts, their names, what info they transmit and how they utilize
movements/tracts
Receptive field – surface area of skin that axon will cover – discriminative touch – ability
to detail shapes/points on what we feel
Receptors involved in touch and pain – different speeds
Dermatomes – vertebra exiting from both sides – what skin is innervated
Proprioception – body will utilize more or be better at it then vision – when playing a
sport – awareness of body in space – just a sensation – muscle spindles (intrafusal
fibres) – attaches to the tendon
Muscle spindles – fibers and gamma motor neurons – must shorten and tighten at same
rate to contract – flex muscle = flex muscle spindles because of motor and gamma
neurons
Joint receptors
Somatosensory pathways  conscious (what we are away over), divergent (spreads
stimulus to pathways), unconscious (goes to cerebellum – used for motor learning)
Dorsal column or medial lemniscus tract and anterolateral column and spinothalamic
tract
Fasciculas
Fast and slow pain
Medial divergent  spinomesencephalic (reflex center – turns head to area of pain),
Spinoreticular (go up to reticular formation of brain), Spinolimbic
Cerebellum – compares what you intended to do vs what you do – looks at how you
activate muscle and used unconscious relay pathways to change how it is done
High-fidelity pathways  posterior spinocerebellar tract
Internal feedback tracts – sends interneuron that sends Info back up to cerebellum so it
knows what muscles were activated and contracted – how you moved
Motor unit recruitment strategies  motor unit is all or none response
Motor recruitment
Medial and lateral upper motor neuron tracts
Basal ganglia – motor loop – inhibit upper motor neurons to make sure none of the
contractions are jerky and are smooth – output of the basal ganglia and why you get the
symptoms of Parkinson’s – know the 5 different loops of the BG
Know function of cerebellum and how it functions – based on how lobes are separated
Posturography – medial motor
Ambulation –medial upper motor neuron tract
Reaching and grasping – know what tract it activates – fine control – lateral motor
Peripheral nerve and sensory changes – due to damage
Classification of mononeuropathies – traumatic myelination/axonopathy and severance
Spinal nerves and anatomy
Myotomes
Know the tracts and where they are in the spinal cord
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Document Summary

Know tracts, their names, what info they transmit and how they utilize movements/tracts. Receptive field surface area of skin that axon will cover discriminative touch ability to detail shapes/points on what we feel. Receptors involved in touch and pain different speeds. Dermatomes vertebra exiting from both sides what skin is innervated. Proprioception body will utilize more or be better at it then vision when playing a sport awareness of body in space just a sensation muscle spindles (intrafusal fibres) attaches to the tendon. Muscle spindles fibers and gamma motor neurons must shorten and tighten at same rate to contract flex muscle = flex muscle spindles because of motor and gamma neurons. Somatosensory pathways conscious (what we are away over), divergent (spreads stimulus to pathways), unconscious (goes to cerebellum used for motor learning) Dorsal column or medial lemniscus tract and anterolateral column and spinothalamic tract. Medial divergent spinomesencephalic (reflex center turns head to area of pain),

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