Describe the three sensory pathways and their function. In your description, please be sure to describe...

Describe the three sensory pathways and their function. In your description, please be sure to describe where these pathways cross over.

Expert Solution

Three sensory pathwy include :-

Posterior column -medial lemniscal (DCML) pathway

It conveys proprioception , vibration sense and fine discriminative touch.
It decussate at the level of internal arcuate fibers at the level of lower medulla.
1st order neuron run on the same side and synapses with secondorder neuron in the dorsal column nuclei.
2nd order neuron integrates the input and their axons cross to the opposite side .These ascend through medial lemniscus.
Further integration in the thalamus and 3 order neuron projects to the cortex.

Anterior spinothalamic tract

It is situated in the marginal part of the anterior funiculus.A beta fibres carry sensory information pertaining to crude touch from the skin.
After entering spinal cord first order neuron synapses .
The second order neurons decussate via the anterior white commissure.
These second order neuron ascend synapsing in VPL (ventroposterolateral) nucleus of thalamus.

Spinoreticular tract

Originates in laminae IV-VIII
Contains uncrossed fibers that end in medullary reticular formation
Crossed and uncrossed fibers that terminate in pontine reticular formation.
Forms part of the ascending reticular activating system.
These neurons decussate to the opposite side (anterolateral), and travel up the spinal column
Involved in arousing consciousness in the reticular activating system through cutaneous stimulation.

Sydney Mullin answered 1 year ago

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