ANAT 321 Lecture Notes - Lecture 4: Substantia Gelatinosa Of Rolando, Posterior Grey Column, Posterior Column

• School: McGill University
• Department: Anatomy & Cell Biology
• Course: ANAT 321
• Professor: David Ragsdale

Document Summary

2 types of somatosensory info into spinal cord. Fine touch & proprioception: heavily myelinated aa & ab. Pain & temp: lightly myelinated adelta, nonmyelinated c. Pain & temp through lissauer"s tract; synapse in spinal cord grey matter (substantia gelatinosa) Fine touch axon turns up dorsal columns in white matter, synapse in brainstem. Neurons also send off branches (collaterals), can synapse in grey matter. White matter stained dark, grey matter stained light. Motor neurons have cell bodies in ventral horns, send axons through ventral roots innervate voluntary muscles. Spinal cord looks diff at diff levels, diff amount of grey/white matter. 2 bulges in spinal cord: cervical & lumbar enlargement. White matter also highly organized; diff regions contain fibre tracts corresponding to diff sensory/motor neurons. Dorsal columns: ascending, sensory fibres up to brain. Anterolateral column: ascending; after pain & temp cross synapse & cross through grey matter, up to thalamus in white matter.