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SYMPATHATIC NERVOUS SYSTEM

SYMPATHATIC NERVOUS SYSTEM. Dr Iram Tassaduq. AUTONOMIC NERVOUS SYSTEM.

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SYMPATHATIC NERVOUS SYSTEM

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  1. SYMPATHATIC NERVOUS SYSTEM • Dr Iram Tassaduq

  2. AUTONOMIC NERVOUS SYSTEM The portions of the CENTRAL & PERIPHERAL nervous system that are concerned primarily with the regulation & control of visceral functions are termed collectively the visceral, vegetative, or autonomic nervous system

  3. AUTONOMIC NERVOUS SYSTEM • Innervate organs not usually under voluntary control. • Effectors include cardiac and smooth muscles and glands. • Effectors are part of visceral organs and blood vessels.

  4. ORGANIZATION OF ANS • AFFERENT NEURONS • EFFERENT NEURONS

  5. SYMPATHETIC TRUNKS • Two ganglionated nerve trunks - paravertebral ganglia • Extend the whole length of vertebral column from the cranial base to the coccyx. • Joined to spinal nerves by ramicommunicantes.

  6. SYMPATHETIC PART OF ANS • Larger part • Widely distributed • Prepares body for emergency & stress – (fight, fright & flight)

  7. COMPOSITION Consists of Efferents Afferents Ganglia – paravertebral & prevertebral Plexuses

  8. Communicating branches arising from thoracic and first two lumbar spinal nerves going to sympathetic ganglion

  9. EFFERENTS • Cell bodies of sympathetic neurons are located in grey matter of spinal cord. • Myelinated axons leave through anterior nerve root and than pass via white ramicommunicantes to paravertebral ganglia

  10. EFFERENT FIBERS • Terminate in the ganglion • Travel upward to the cervical region • Pass through ganglion without synapsing

  11. AFFERENTS • The afferent myelinated nerve fibers travel from the viscera through the sympathetic ganglia without synapsing. • They reach their cell bodies in the posterior root ganglion of the corresponding spinal nerve

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