Somatosensory pathways Flashcards
Anterolateral pathway - modalities
Crude touch
Nociception
Temperature
… from contralateral body
Dorsal column pathway - modalities
Discrete touch Pressure Vibration Conscious proprioception ... from ipsilateral upper limb (cuneatus) and lower limb (gracilis)
Anterolateral pathway - location of 1st order neuron cell body
Dorsal root ganglion
Dorsal column pathway - location of 1st order neuron cell body
Dorsal root ganglion
Anterolateral pathway - location of 2nd order neuron cell body
Dorsal horn of spinal cord
Dorsal column pathway - location of 2nd order neuron cell body
Nucleus gracilis and nucleus cuneatus
Anterolateral pathway - location of 3rd order neuron cell body
VPL of thalamus
Dorsal column pathway - location of 3rd order neuron cell body
VPL of thalamus
Anterolateral pathway - location of decussation
Spinal cord via and anterior white commissure
Dorsal column pathway - location of decussation
Caudal medulla
Anterolateral pathway - somatotopic organisation
New fibres join at the anteromedial edge - sacral most lateral, cervical most medial
Dorsal column pathway - somatotopic organisation
New fibres joint at the lateral edge - cervical most lateral, sacral most medial
Anterolateral pathway - location of final synapse
Primary somatosensory cortex - postcentral gyrus
Dorsal column pathway - location of final synapse
Primary somatosensory cortex - postcentral gyrus
Anterolateral pathway - contributing fasciculi
1 - anterolateral fasciculus
Dorsal column pathway - contributing fasciculi
2 - fasciculus gracilis (medial) and fasciculus cuneatus (lateral)
Spinal trigeminothalamic - modality
Nociception
Temperature
Chief sensory trigeminothalamic - modality
Discriminative touch
Spinal trigeminothalamic - location of 1st order neuron cell body
Trigeminal ganglion
Chief sensory trigeminothalamic - location of 1st order neuron cell body
Trigeminal ganglion
Spinal trigeminothalamic - location of 2nd order neuron cell body
Spinal nucleus - medulla
Chief sensory trigeminothalamic - location of 2nd order neuron cell body
Chief sensory nucleus - pons
Spinal trigeminothalamic - location of 3rd order neuron cell body
VPM of thalamus
Chief sensory trigeminothalamic - location of 3rd order neuron cell body
VPM of thalamus
Spinal trigeminothalamic - location of decussation
Medulla
Chief sensory trigeminothalamic - location of decussation
Pons
Posterior spinocerebellar - function
Subconcsious proprioception of trunk and ipsilateral LL
Cuneocerebellar - function
Subconscious proprioception of ipsilateral UL
Anterior spinocerebellar - function
Compares incoming proprioception from LL with descending input to lower motor neurons
Posterior spinocerebellar - location of 1st order neuron cell body
Dorsal root ganglion
Cuneocerebellar - location of 1st order neuron cell body
Dorsal root ganglion
Anterior spinocerebellar - location of 1st order neuron cell body
Dorsal root ganglion
Posterior spinocerebellar - location of 2nd order neuron cell body
Clarke’s nucleus (C8-L3)
Cuneocerebellar - location of 2nd order neuron cell body
Accessory cuneate nucleus (medulla)
Anterior spinocerebellar - location of 2nd order neuron cell body
Spinal border cells (ventral horn of spinal cord)
Posterior spinocerebellar - enters cerebellum via
Inferior cerebellar peduncle
Cuneocerebellar - enters cerebellum via
Inferior cerebellar peduncle
Anterior spinocerebellar - enters cerebellum via
Superior cerebellar peduncle
Posterior spinocerebellar - 2nd order neuron ascends in …
Lateral funiculus
Cuneocerebellar - 1st order neurons ascends in…
Fasciculus cuneatus
Anterior spinocerebellar - decussaates
In spinal cord after synapse with 2nd order neuron in spinal border cells
Again in the cerebellum