ACB 334 Lecture Notes - Lecture 10: Postcentral Gyrus, Somatosensory System, Reticular Formation

• School: U of S
• Department: Anatomy and Cell Biology
• Course: ACB 334
• Professor: Jen Chlan

Document Summary

Info taken from receptors of primary sensory neurons (drg for sc; peripheral ganglion for brain) e. g. proprioception, mechanoreceptors, chemoreceptors, thermoreceptors and nocioceptors. Info is passed to second order neurons (sc/brainstem - medulla) to thalamus or cerebellum. Info passed on from the tertiary neuron in the thalamus to the cortex (may have other stations along the way e. g. thalamus, reticular formation) *peripheral ganglia = grey matter structures; made of cell bodies. *there is one exception where the 1st order neuron is not drg. 1st order neuron 1st order afferent 2nd order neuron at 1st order synapse 2nd order afferent 3rd order neuron at 2nd order synapse 3rd order afferent 3rd order synapse. Enter sc and ascend dorsal column (fasciculus trunk and limbs to the gracilis/cuneatus) cortex. 2nd order neuron: caudal medulla (nuclei gracilis/cuneatus) proprioceptive info about. Nuclei forms the tubercle at the dorsal surface of the lower limb is carried via medulla dorsal spinocerebellar.