Spinal Sensory and Motor Pathways
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| show | From somatic receptors to primary somatosensory area in the cerebral cortex
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| show | 3
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| show | Axon collaterals of somatic sensory neurons
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| What order neurons conduct impulses to CNS? | show 🗑
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| What neurons conduct impulses from brainstem or spinal cord to thalamus? | show 🗑
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| What neuron conducts impulses from thalamus to primary somatosensory cortex? | show 🗑
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| What kind of information does the posterior column carry? | show 🗑
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| show | Medial lemniscus
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| What kind of activities use discriminative touch and proprioception? | show 🗑
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| show | Ability to perceive shape of an object through touch?
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| Where are 1st order neurons found in? | show 🗑
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| show | Spinal cord of brainstem
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| show | Ventral posterior nucleus of thalamus
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| show | Discriminative touch and conscious proprioception
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| show | Recognition of exact location object touched skin, two-point discrimination, stereognosis, awareness of position of body parts and direction of movement, ability to sense weight of object, ability to sense vibration
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| What is stereognosis? | show 🗑
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| What does it mean that the posterior column-medial lemniscus pathway runs ipsilateral? | show 🗑
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| In posterior column, from where do first order neurons enter the spinal cord? | show 🗑
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| show | Fasciculus gracilis
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| In the posterior column-medial lemniscus, where do fibers from the upper parts of the body ascend in? | show 🗑
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| In the posterior column-medial lemniscus, where do 1st order neuron and 2nd order neurons synapse in? | show 🗑
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| show | Internal arcuate fibers - when axons of neurons cross the midline, forms an arc
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| In the posterior column-medial lemniscus, after the 2nd order neuron crosses the midline, where will it be packed? | show 🗑
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| In the posterior column-medial lemniscus, where does the 2nd order neuron synapse with the 3rd order neuron? | show 🗑
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| show | Crude vibrations
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| In the posterior column-medial lemniscus, what structure do 3rd order neurons have to pass through to reach the cortex? | show 🗑
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| show | Crude touch and pressure
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| show | Sensory fibers enter spinal cord and synapse with 2nd order in dorsal root where it will cross midline
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| show | Travel up or down - one or two segments in Lissauer's tract
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| What is the Lissauer's tract? | show 🗑
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| Where is the Lissauer's tract located? | show 🗑
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| show | Need to involve several segments - like in withdrawal reflex or cross extensor reflex
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| In the anterior spinothalamic pathway, what area does the 2nd order neuron have to cross into? | show 🗑
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| show | Through anterior white commissure
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| show | Small white matter between anterior horns of spinal cord in front of central canal
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| show | 2nd order neurons on both sides
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| What is the implication of having 2nd order neurons on both sides of the anterior white comissure? | show 🗑
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| In the anterior spinothalamic pathway, where does the 2nd order neuron synapse with the 3rd order? | show 🗑
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| show | Vague awareness and crude localization of touch and pressure
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| In the anterior spinothalamic pathway, how does the 3rd order neuron send info to cortex | show 🗑
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| show | Full awareness and localization for pressure and touch
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| What kind of information is carried through lateral spinothalamic tract? | show 🗑
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| show | Identical to each other except for function and location
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| What is the function of anterior and lateral spinothalamic tract? | show 🗑
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| In the lateral spinothalamic tract, where does the 1st order neuron synapse with the 2nd order? | show 🗑
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| In the lateral spinothalamic tract, what neurotransmitter is thought to be released ? | show 🗑
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| show | Spinotectal tract
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| show | Drives reflexes that turn head to look at stimulus
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| How does the spinotectal tract differ from the spinothalamic? | show 🗑
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| How does the spinotectal tract drive reflexes? | show 🗑
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| show | Spinoreticular and spinomesencephailc
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| show | Bring awareness and alertness to injury
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| show | Enters dorsal horn and synapses but does NOT cross. Travels up ipsilateral side in lateral column
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| show | Reticular formation
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| show | Connects to limbic system – fear and aversion reactions associated with pain
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| show | Periaqueductal grey region
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| What do the neurons in PAG contain? | show 🗑
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| Where do the neurons in the upper motor neurons begin? | show 🗑
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| Where do the neurons in the upper motor neurons terminate in? | show 🗑
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| show | Brainstem
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| Where do the corticobulbar tract synapse on? | show 🗑
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| show | Spinal cord
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| show | Motor neurons in ventral horn of spinal cord q
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| For the extra pyramidal pathway, where does it sart and end in? | show 🗑
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| show | Brain stem or spinal cord
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| What does the lower motor neuron innervate? | show 🗑
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| show | Ventral horn
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| Where are the cell bodies of lower motor neurons in the brainstem? | show 🗑
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| What tract is involved in upper motor neuron lesions? | show 🗑
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| show | Contralateral
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| What are some symptoms of an upper motor neuron lesion? | show 🗑
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| What are symptoms of a lower motor neuron lesion? | show 🗑
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| show | Motor neurons in ventral horn of spinal cord and after
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| What side is affected for lower motor neuron lesions? | show 🗑
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| show | Internal capsule, crus cerebri of midbrain, basilar portion of pons, pyramids of medulla
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| show | Most fibers cross at decussation of pyramids
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| show | Lateral corticospinal tract
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| show | Lateral column of spinal cord
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| show | Anterior corticospinal tract
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| show | Anterior column of spinal cord
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| For the corticospinal tracts, when does the anterior corticospinal tract cross over? | show 🗑
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| What is the function of the corticospinal tract? | show 🗑
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| show | Sensory cortex, cerebellum, etc
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| show | Controls movements of the head in response to visual stimuli
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| Where does the tectospinal tract begin? | show 🗑
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| What is the significance of where the tectospinal tract begins? | show 🗑
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| show | Yes, fibers cross soon after origin and descend through brainstem
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| show | Anterior
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| show | Upper cervical segments of spinal cord
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| show | Nuclei of cranial nerves III, IV, VI
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| show | Coordination of eye movements
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| The spinal accessory nerve is originated from what CN? | show 🗑
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| Where does the lateral vestibulospinal tract begin? | show 🗑
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| What do the vestibular nuclei belong to? | show 🗑
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| show | Fibers don’t cross midline but descend ipsilaterally
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| show | Anterior column of spinal cord
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| What is the function of the lateral vestibulospinal tract? | show 🗑
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| What structures does the lateral vestibulospinal tract receive input from? | show 🗑
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| show | Pontine – reticular formation of pons; Medullary – reticular formation of medulla
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| How do the pontine and medullary reticulospinal tract differ? | show 🗑
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| What is the function of the reticulospinal tract? | show 🗑
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| show | Allows for inhibition of antagonist muscle when agonist is contracted
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| What structures does the reticulospinal tract receive input from? | show 🗑
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| How is pain modulated? | show 🗑
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| show | Flexor
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| What muscles are excited in the lateral vestibulospinal tract? | show 🗑
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| show | Function is balance which needs extensor side
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| show | Rubrospinal tract
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| show | Crawling before walking. Damage to CPT can be overcome with time by RS
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| show | Rubrospinal
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| Why is the rubrospinal tract called a crossed pathway? | show 🗑
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| show | Red nucleus of midbrain
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| Describe the path for the rubrospinal tract | show 🗑
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| show | Extensor
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| show | Flexor
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| What is the direction of nervous system development and myelination? | show 🗑
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| What is the implication of the direction of nervous system development? | show 🗑
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| show | Muscle tone and posture, skeletal muscle control
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| show | Cerebellum, cerebral cortex, branches of corticospinal tracts
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Created by:
nnguyen44
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