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KIN 131 > Peripheral Nervous System > Flashcards

Peripheral Nervous System Flashcards

1
Q

What is the function of the PNS?

A

Transmission of signals between the CNS and receptors/effectors

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2
Q

What are Nerves?

A

bundled groups of axons

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3
Q

How many pairs of Nerves are in the PNS?

A

43 pairs of nerves in the PNS

  • Cranial (12)
  • Spinal: cervical (8), thoracic (12), lumbar (5), sacral (5) and coccygeal (1)

All spinal nerves have both afferent and efferent neurons

dont need to know numbers or names

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4
Q

What is The function of the Somatic Nervous System?

division of the PNS

A
  • Skeletal muscle innervation
  • Cell bodies found in brainstem / ventral horn (spinal cord)
  • Large diameter, myelinated axons travel from the CNS to skeletal muscle without additional synapses
  • Excitatory-only – no somatic neurons inhibit skeletal muscle contraction
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5
Q

A division of the PNS

What is The Autonomic Nervous System?

Innervates non-skeletal muscle

A
  • regulates involuntary bodily functions
  • Can be excitatory or inhibitory

Two neurons in series that connect the CNS to the effector

  • 1st neuron has cell body in CNS
  • Synapse between two neurons is outside the CNS, in the autonomic ganglion
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6
Q

What are divisions of the ANS?
(Autonomic Nervous System)

A

The Sympathetic Nervous System
The Parasympathetic Nervous Systems

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7
Q

ANS

What is the Sympathetic Nervous System?
What major neurotransmitters does it release?

A

The Sympathetic Nervous System

  • “Fight or flight”
  • Typical for response to be “body-wide”
  • Neurons leave spinal cord at thoracic & lumbar regions
  • Major NT released between pre- and postganglionic neurons -> ACh
  • Major NT released between postganglionic neuron and receptor cells -> NorEpinephrine
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8
Q

What does The Adrenal Medulla release?

A

Sympathetic innervation

  • Activation by preganglionic sympathetic neurons causes the release of epi and NE into the blood (80: 20)
  • Hormones travel in the blood to effector cells
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9
Q

What are The Parasympathetic Nervous Systems?

A

“Rest and digest”

  • Typical for response to be “tailored”
  • Neurons leave the spinal cord at brainstem and the sacral region of the spinal cord
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10
Q

What are the Major NT of The Parasympathetic Nervous Systems?

A

Major NT released between
pre- and postganglionic neurons -> ACh

Major NT released between
postganglionic neuron and receptor cells -> ACh

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11
Q

Summary image

A
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12
Q

What is Dual Innervation?

A

many effector cells are innervated by both the parasympathetic and sympathetic nervous system.

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13
Q

Effects of Sympathetic and Parasympathetic

A
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KIN 131 (44 decks)

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