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What is the function of the posterior (dorsal) column-medial lemniscus pathway?
- tactile discrimination, vibration sensation, conscious proprioception
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What receptors are associated with the posterior (dorsal) column-medial lemniscus pathway?
Pacinian and Meissner's tactile corpuscles, joint receptors, muscle spindles, Golgi tendon organs
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Name two tracts in the posterior (dorsal) column.
- Gracile fasciculus, Cuneate fasciculus
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The Gracile fasciculus is responsible for…
The lower extremity
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The cuneate fasciculus is responsible for..
The upper extremity
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The posterior (dorsal) column-medial lemniscus fibers decussate where?
- Caudal medulla
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Transection of the posterior (dorsal) column-medial lemniscus tract above the sensory decussation leads to...
Contralateral loss of dorsal column modalities
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Transection of the posterior (dorsal) column-medial lemniscus tract in the spinal cord leads to...
ipsilateral loss of dorsal column modalities
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What is the function of the lateral spinothalamic tract?
- Mediates pain and temperature sensation
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What receptors are associated with the lateral spinothalamic tract?
Free nerve endings: fast (A-delta) and slow (C) pain fibers
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The lateral spinothalamic tract decussates where?
- In the white ventral commissure of the spinal cord at the level of the spinal nerve
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Transection of the lateral spinothalamic tract leads to…
contralateral loss of pain and temperature below the lesion
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What is the function of the lateral corticospinal tract?
- Voluntary skilled motor activity of the upper limbs
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The lateral corticospinal tract decussates where?
- The medullary pyramids
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Transection of the lateral corticospinal tract above the medullary pyramids leads to…
Contralateral spastic paresis and Babinski's sign
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Transection of the lateral corticospinal tract in the spinal cord leads to...
Ispilateral spastic paresis and Babinski's sign
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Name the tracts affected, and the resulting sequelae, of a spinal cord hemisection.
- dorsal column: ipsilateral loss of tactile discrimination, position and vibratory sensation; lateral corticospinal tract: ipsilateral spastic paresis; lateral spinalthalamic tract: contralateral loss of pain and temerature sensation; ventral horn: ipsilateral flaccid paralysis
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Name the tracts affected, and the resulting sequelae, of ventral spinal artery occlusion.
- lateral corticospinal tract: bilateral spastic paresis; lateral spinothalamic tract: bilateral loss of pain and temperature sensation; ventral horn: bilateral flaccid paralysis
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Name the tracts affected, and the resulting sequelae, of Vitamin B12 neuropathy.
dorsal column: bilateral loss of tactile discrimination, position and vibratory sensation; lateral corticospinal tract: bilateral spastic paresis; spinocerebellar: bilateral dystaxia
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Name the tracts affected, and the resulting sequelae, of Syringomyelia.
- ventral white commissure: bilateral loss of pain and temperature sensation (loss of lateral spinothalamic decussation); ventral horn: flaccid paralysis
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