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Peripheral Nervous System. What do you see?. CNS AND PNS. Characteristics of the P.N.S. Nerves that branch out from brain, spinal column Not covered w/ meninges No CSF Divided into somatic and autonomic branches. 2 Divisions:. Somatic Nervous System CRANIAL & SPINAL nerves

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what do you see
What do you see?


characteristics of the p n s
Characteristics of the P.N.S.

Nerves that branch out from brain, spinal column

Not covered w/ meninges


Divided into somatic and autonomic branches

2 divisions
2 Divisions:
  • Somatic Nervous System
    • CRANIAL & SPINAL nerves
      • Afferent Sensory nerves
      • Efferent, VOLUNTARY Motor nerves
  • Autonomic Nervous System
    • Parasympathetic & Sympathetic Systems
      • INVOLUNTARY motor nerves
      • Maintains homeostasis
you ve got a lot of nerve cranial nerves that is
You’ve got a lot of nerve! (Cranial Nerves, that is!)
  • Twelve total
  • Arise from brain, passing through various foramina
  • Specialized tasks – some sensory, motor, or both
    • Some with multiple branches
  • Identified by Roman numeral and anatomical name
mnemonic time
Mnemonic time!

“Oh, Oh, Oh, To Touch And Feel Very Green Vegetables… Aah, Heaven”

…there are more out there… They help you remember…

Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Vestibulocochlear, Glossopharangeal, Vagus, Accessory, Hypoglossal

  • Sammy Sosa Made Money, But My Brother Says Barry Bonds Made More
    • S = sensory
    • M = motor
    • B = both
pns autonomic nervous system
PNS: Autonomic Nervous System

Can you explain each of these?

autonomic nervous system
Autonomic Nervous System
  • Regulates internal environment
    • Controls glands, cardiac muscle, smooth muscle
    • Homeostasis!
      • Integrated with endocrine system
      • Digestion, sexual functions, stress responses
  • No conscious thought…
a nervous system divided
A nervous system divided…


Thoracic, lumbar spinal nerves

Prepares body to react to stress

“Fight or Flight”

“S for stress”


  • Cranial nerves, sacral spinal nerves
  • Promotes relaxation, digestion
    • “Post-stress”, P.S.
it s all about connections
It’s all about connections…
  • Somatic nerves:
    • Full length of nerve connects spinal cord to body component
      • Cell body in gray matter… terminus contacts effector
  • Autonomic nerves:
    • Two neurons working together
    • Preganglionic originates in brain/spinal cord
      • Myelinated
    • Synapses with postganglionic neuron (non-myelinated)
form follows function
Form follows function…
  • In parasympathetic nervous system…
    • Preganglionic neurons long, terminate close to effector (short postganglionic neuron)
    • Allows specific, targeted control
  • In sympathetic nervous system…
    • Preganglionic neurons short, terminate close to spinal cord (sympathetic ganglion chain)
    • Postganglionic neurons long, travel from ganglion to effector
    • Allows widespread activation of body systems
double agents
Double agents?
  • Effectors receptive to both systems… how?
  • Preganglionic nerves of Symp, Parasymp NS secrete acetylcholine…
  • Postganglionic nerves secrete different NT’s
    • Parasympathetic NS  acetylcholine
    • Sympathetic NS  norepinephrine
  • Cause antagonistic effects in effector