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Human Anatomy and Physiology

Human Anatomy and Physiology

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Human Anatomy and Physiology

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  1. Human Anatomy and Physiology Autonomic nervous system

  2. ANS organization

  3. SNS - ANS comparison

  4. SNS - ANS comparisons

  5. ANS organization • Parasympathetic • Cranial, S2 & S4 • Ganglia close to organ • Sympathetic • T1 - L2 • Ganglia far from organ • paravertebral

  6. Effects of divisions

  7. Naming nerves of the ANS • All preganglionic are cholinergic(Ach) • Postganglionic neurons of parasympathetic are cholinergic(Ach) • Postganglionic neurons of sympathetic are adrenergic(norepinepherine)

  8. Cholinergic receptors • Receptors that bind Ach • Types: Nicotinic receptors • Location • Postganglionic neurons (symp. & parasymp.) • Adrenal medulla cells • Skeletal muscle cells • Effect: always stimulatory

  9. Cholinergic receptors • Types: Muscarinic receptors • Location • All parasympathetic target organs • Some sympathetic target organs (i.e., sweat glands) • Effect: inhibitory or stimulatory

  10. Adrenergic receptors • Receptors that bind norepinephrine • Classes: alpha and beta • Alpha - generally stimulatory • Except for digestion • Beta - generally inhibitory • Except for heart

  11. ANS control