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Peripheral Nervous System

Peripheral Nervous System. Chapter 8. Peripheral Nervous System. Nerves connecting the brain and spinal cord to other parts of the body. Cranial Nerves . 12 pairs attach to the undersurface of the brain. Spinal Nerves . 31 pairs 8 cervical 12 thoracic 5 lumbar 5 sacrospinal

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Peripheral Nervous System

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  1. Peripheral Nervous System Chapter 8

  2. Peripheral Nervous System • Nerves connecting the brain and spinal cord to other parts of the body

  3. Cranial Nerves 12 pairs attach to the undersurface of the brain

  4. Spinal Nerves • 31 pairs • 8 cervical • 12 thoracic • 5 lumbar • 5 sacrospinal • 1 coccygeal

  5. Autonomic Nervous System • Consists of motor neurons that conduct impulses from the spinal cord or brainstem to cardiac, smooth, and glandular epithelial tissue (involuntary functions) • the heartbeat • contractions of the stomach and intestines • secretions by glands

  6. Sympathetic Nervous System Controlled in the thoracic and upper lumbar segments of the spinal cord Functions as an emergency system – takes control when we exercise strenuously and when strong emotions (anger, fear, hate, anxiety) are elicited.

  7. ParasympatheticNervous System • Controlled in the brainstem and sacral segments of the spinal cord (craniosacral system). • Controls under normal, everyday conditions. • Tends to do the opposite of the sympathetic nervous system. • Together they help our bodies to maintain homeostasis.

  8. Responses Sympathetic Parasympathetic Slow heartbeat Increase peristalsis Increase secretion of digestive juices and insulin. • Heart beats faster • Most blood vessels constrict, causing blood pressure to increase. • Blood vessels in muscles dilate, supplying the muscles with more blood. • Sweat glands and adrenal glands secrete more abundantly. • Salivary and other digestive glands secrete more sparingly. • “fight or flight”

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