Flashcards in ascending sensory pathways 1 Deck (14):
what type of fibres are associated with modalities essential to survival? - pain temp, touch, pressure
thin, poorly myelinated or unmyelinated fibres - slow conduction
what type of fibres are associated with modalities that increase detail? - discriminatory touch, proprioception
large diameter, thick, heavily myelinated fibres - fast conduction
how many neurons are in a general sensory pathway?
where do the cell bodies of sensory pathway reside?
dorsal root ganglia
which neutron always crosses the midline?
2nd order neurons
which neutron projects to the thalamus?
3rd order neuron
which pathway is pain, temp, touch and pressure?
which tract do the secondary neurons ascend in the spinothalamic pathway?
the spinothalamic tract
where does the secondary axon cross the midline in the spinothalamic pathway?
ventral white commissure
which pathway is for discriminative touch and proprioception?
dorsal column pathway
where do the secondary neurons of dorsal column cross the midline?
in the internal arcuate fibres at level of closed medulla
what tract do the fibres ascend to the thalamus in the dorsal column pathway?
the medial lemniscus
do dorsal column fibres travel contra laterally or ipsilaterally in the cord?
ipsilaterally - cross at level of closed medulla