Kinesiology 3222A/B Lecture Notes - Lecture 3: Medial Lemniscus, Posterior Column, Pyramidal Tracts

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 3222A/B
• Professor: Katelyn Wood

Document Summary

Describe the location and function of the 2 major ascending (sensory) spinal tracts. Draw the pathways of sensory information from body to brain, labelling appropriate neural components and synapse locations. Contains: neuron cell bodies, glial cell bodies. Dorsal horn = sensory information comes in. Ventral horn = motor information comes out. **white matter is white because of myelin on axons. Sensory = ascending (sc (periphery) to brain: spinothalamic, dorsal column - medial lemniscus, 3 neuron pathway: Sensory a erent (collecting information in the periphery), sc tract (travels within spinal cord), tertiary is one that travels from thalamus -> cortex. Motor = descending (brain to sc: pyramidal (corticospinal + corticobulbar, extrapyramidal (reticulospinal, tectospinal, rubrospinal + vestibulospinal, 2 neuron pathway: umn to lmn. Sensory informations starts at e ector organ, travel up toward brain. First order neurone is the sensory a erent, rst one in the chain, synapses with second order neurone forming ascending tracts.