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lectures_7-8 - Spinal Cord Figure 9-4a: ANATOMY SUMMARY:...

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Unformatted text preview: Spinal Cord Figure 9-4a: ANATOMY SUMMARY: The Central Nervous System The Spinal Cord major information pathway between brain and skin, joints and muscles neural networks for Locomotion severed cord - loss of sensation and/or paralysis The Spinal Cord interneurons route sensory Information spinal cord anatomy:-cervical-thoracic-lumbar-sacral subdivided into segments each segment has bilateral pair of nerves 31 pairs of spinal nerve Gray matter: mostly cell bodies Dendrites & terminals Spinal reflex integrating center White matter Bundles of myelinated axons Ascending tracts sensory Descending tracts motor Dorsal roots Ventral roots Spinal Cord Organization Roots: spinal nerve divides into two branches before joining the cord 1. Dorsal root: specialized to carry incoming sensory information 2. Ventral root: carries information from the CNS to the muscles and glands cross-section reveals: gray matter and white matter Gray matter: cell bodies of interneurons and efferent neurons Dorsal root ganglia : sensory neuron cell bodies Dorsal horns : sensory fibers from dorsal roots enter the gray matter Ventral horns : efferent neurons leave gray matter-somatic motor neuron cell bodies-autonomic neuron cell bodies White matter: contains axons - divided into columns composed of tracts Dorsal column:carries somatic sensory information - spinal cord to brain Lateral and ventral column: carry sensory information both ways Not all information goes to the brain-spinal cord integrates simplest reflexes Trillion interneurons fill the brain Up to 200,000 synapses each Brain divisions Cerebrum Diencephalons Cerebellum Midbrain Pons Medulla oblongata Brain Overview The Brain: compartmentalized 1. Parallel processing 2. Plasticity two neural elements 1. neuron cell bodies 2. nerve cell fibers Adult brain: 1. Brain stem 2. Cerebellum 3. Cerebrum The brain stem: extension of spinal cord- divides into three sections 1. Medulla oblongata 2. Pons 3. Midbrain 4. Diencephalon contains third and fourth ventricles nine cranial nerves emerge (see Table 9-1) Medulla oblongata:...
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This note was uploaded on 02/01/2011 for the course BIOL 273 taught by Professor Norman during the Spring '08 term at Waterloo.

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lectures_7-8 - Spinal Cord Figure 9-4a: ANATOMY SUMMARY:...

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