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Ch 17: Autonomic Division of NS. Compare and contrast the structures of the sympathetic and the parasympathetic divisions, including functions and neurotransmitters. Show the levels of integration in the ANS, and compare these with the SNS. Overview of ANS. Pathway for Visceral Motor Output

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ch 17 autonomic division of ns

Ch 17: Autonomic Division of NS

Compare and contrast the structures of the sympathetic and the parasympathetic divisions, including functions and neurotransmitters.

Show the levels of integration in the ANS, and compare these with the SNS.

overview of ans
Overview of ANS

Pathway for Visceral Motor Output

ANS has two antagonistic divisions:

  • Sympathetic
  • Parasympathetic

ANS output always involves two neurons between spinal cord (CNS) and effector.

slide3
Synapsing takes place in ganglia

Naming of neurons:

?

Fig 17.3

sympathetic division
Sympathetic Division

Thoracolumbar division

Preganglionic neurons (cell bodies) located between T1 & L2 of spinal cord

Ganglionic neurons (cell bodies) in ganglia near vertebral column

Paravertebral ganglia = sympathetic chain ganglia

Prevertebral ganglia = collateral ganglia

Special case: adrenal medulla

Effects of Sympathetic Division?

special case adrenal medulla
Special Case:Adrenal medulla

Fig. 17-6

Modified sympathetic ganglion

Terminus for neuron #1, stimulates specialized 2nd order neurons with very short axons in adrenal medulla to release NT into blood stream (= hormones)

Epinephrine (adrenalin) ~ 80% and norepinephrine (noradrenalin)

Endocrine effects are longer lasting than nervous system effects

sympathetic neuroeffector junctions
Sympathetic Neuroeffector Junctions

Differ from somatic neuromuscular junctions

Varicosities

Fig 17-6

summary of sympathetic division
Summary of Sympathetic Division

A. Neuron #1 is short, neuron #2 is long

B. Synapsing occurs in prevertebral chain ganglia or paravertebral collateral ganglia

C. Neuron #1 releases Ach, usually neuron #2 releases NE

D. Prepares for emergency action, excitatory to many organs, inhibitory to others ( digestive for example)

E. Effects very widespread and somewhat persistent

para sympathetic division
Para – SympatheticDivision

Craniosacral division

Preganglionic neurons (cell bodies) located in brain stem & sacral segments of spinal cord

Ganglionic neurons (cell bodies) in ganglia near target organs: Intramural ganglia

Effects of parasympathetic division ?

summary of parasympathetic division
Summary of Parasympathetic Division

A. Neurons #1 are long, come from the brain stem or sacral spinal cord, run with the spinal or pelvic nerves and produce ACh.

B. Neurons #2 are short, produce ACh, and may be either excitory or inhibitory.

anatomy of dual innervation
Anatomy of Dual Innervation

Each organ receives innervation from sympathetic and parasympathetic fibers

Fibers of both divisions meet & commingle at plexuses (fig 17-9) to innervate organs close to those centers

Names of plexuses derived from locations or organs involved