9. Spinal Cord & Peripheral Nerve Outline.doc - 9 Spinal Cord Peripheral Nerves Reflexes The spinal cord is structurally functionally integrated

9. Spinal Cord & Peripheral Nerve Outline.doc - 9...

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9. Spinal Cord, Peripheral Nerves & Reflexes The spinal cord is structurally & functionally integrated w/the brain. It provides sensory input from, and sends integrated motor messages to the periphery via somatic and autonomic nerves. Gross Anatomy of Spinal Cord 1. Conus Medullaris (Level of L1/L2 in adult) a. Filum terminale b. Cauda equina 2. Anterior Median Fissure and Posterior Median Sulcus 3. Dorsal Root (afferent/sensory axons from spinal nerve after enters IVF) a. Dorsal Root Ganglia (DRG): soma of somatosensory neurons. 4. Ventral Root (efferent/motor axons from motor neurons and exiting via spinal nerve) 5. Inner Grey Matter (butterfly-shape): neuronal soma, dendrites and unmyelinated axons a. Posterior horn: sensory nuclei which relay sensory signals to the brain & brainstem b. Anterior horn: somatic motor nuclei which serve as basis of motor unit to skeletal muscles c. Lateral horn (T1-L2): sympathetic motor nuclei innervates glands, smooth & cardiac muscles d. Central Canal: CNS from 4 th ventricle e. Grey Commissure 6. Outer White Matter: mainly tracts of myelinated axons a. Ascending Columns or Funiculi are conveying sensory signals to brain/brainstem i. Spinothalamic convey crude touch, pain and temperature ii. Posterior columns convey fine/discriminatory touch, proprioception & vibration iii. Spinocerebellar tracts convey proprioceptive signals to the Cerebellum b. Descending Columns or Funiculi are conveying motor signals from brain to motor nuclei i. Corticospinal (Pyramidal) tract convey conscious motor commands to anterior horn ii. Extrapyramidal tracts con vey subconscious commands from brainstem to anterior horn 7. Cervical & Lumbosacral spinal segment enlargements: upper & lower extremities.
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  • Spring '09
  • JR

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