Spinal Cord - ALL ABOUT THE SPINAL CHORD 13-1 Functions of...

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ALL ABOUT THE SPINAL CHORD 13-1
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Functions of Spinal Cord Final common pathway for the somatomotor system Conveys somatosensory information from the body Autonomic neurons Reflexes Central pattern generators for rhythmic movements
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Sensory vs motor roots Ventral: somatic motor + visceral motor
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Motor Neurons Alpha and gamma motor neurons aka ventral horn cells, anterior horn cells Very elaborate dendritic tree Neurotransmitter =Ach Alpha: extrafusal fibers Gamma: intrafusal fibers
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13-5 Spinal Cord and Spinal Nerves Spinal cord Spinal nerves
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13-6 Overview of Spinal Cord Information highway between brain and body Extends through vertebral canal from foramen magnum to L1 Each pair of spinal nerves receives sensory information and issues motor signals to muscles and glands Spinal cord is a component of the Central Nervous System while the spinal nerves are part of the Peripheral Nervous System
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13-7 Functions of the Spinal Cord Conduction bundles of fibers passing information up and down spinal cord Locomotion repetitive, coordinated actions of several muscle groups central pattern generators are pools of neurons providing control of flexors and extensors (walking) Reflexes involuntary, stereotyped responses to stimuli (remove hand from hot stove) involves brain, spinal cord and peripheral nerves
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13-8 Anatomy of the Spinal Cord Cylinder of nerve tissue within the vertebral canal (thick as a finger) vertebral column grows faster so in an adult the spinal cord only extends to L1 31 pairs of spinal nerves arise from cervical, thoracic, lumbar and sacral regions of the cord each cord segment gives rise to a pair of spinal nerves Cervical and lumbar enlargements Medullary cone (conus medullaris) = tapered tip of cord Cauda equinae is L2 to S5 nerve roots resemble horse’s tail
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13-9 Gross Anatomy of Lower Spinal Cord
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13-10 Meninges of the Spinal Cord 3 Fibrous layers enclosing spinal cord
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Spinal Cord - ALL ABOUT THE SPINAL CHORD 13-1 Functions of...

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