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Anatomy (Biol 240) > Chapter 12: Peripheral Nervous System > Flashcards

Chapter 12: Peripheral Nervous System Flashcards

1
Q

Brain and Spinal Cord

A

CNS

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2
Q

Nerves and Ganglion

A

PNS

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3
Q

Collection of neuron cell bodies

A

Ganglion

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4
Q

PNS Categories

A
  1. Motor or Sensory
  2. General (widespread) or Specialized (local)
  3. Somatic or Visceral
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5
Q

Structure of the PNS

A

Sensory receptors, Nerves and ganglia, Motor ending

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6
Q

Exteroceptors

A

Sensitive to stimuli arising from outside body

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7
Q

Interoceptors

A

Or visceroreceptors, from internal viscera

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8
Q

Proprioceptors

A

Monitor degree of stretch in skeletal muscles, tendons, joints and ligaments

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9
Q

Mechanoreceptors

A

Respond to touch, pressure, vibrations

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10
Q

Baroreceptors

A

Respond to changes in blood pressure

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11
Q

Thermoreceptors

A

Respond to temperature change

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12
Q

Chemoreceptors

A

Respond to molecules tasted or smelled, and changes in the blood chemistry

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13
Q

Photoreceptors

A

Respond to light

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14
Q

Nociceptors

A

Respond to harmful stimuli (extreme heat and cold) that result in pain

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15
Q

Free Nerve Endings

A
  • Monitor most type of sensory information (touch, pain, pressure, temperature, proprioception)
  • Not surrounded by a capsule of connective tissue. Mostly nociceptors and thermoreceptors
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16
Q

Complete Receptor Cells

A
  • Specialized epithelial cells or small neurons that transfer sensory information to sensory neurons (taste, vision, hearing, and equilibrium)
  • Surrounded by a capsule of connective tissue (encapsulated). All mechanoreceptors
17
Q

Proprioceptors

A
  • Encapsulted nerve endings
  • Skeletal muscles, joints, tendons, ligaments
  • Degree of stretch, therfore information on body movement:
    • to cerebrum
    • cerebellum and
    • spinal reflex arcs
  • Include: - Muscle spindles
    • Golgi tendon organs
    • Joint kinesthetic receptors
18
Q

Peripheral motor endings

A
  • Innervation of skeletal muscle

- Innervation of visceral muscles and glands

19
Q

Motor end plates

A

Motor axons innervate skeletal muscle fibers at neuromuscular junctions

20
Q

Innervations of visceral muscles and glands

A
  • Wider synaptic clefts
  • Smooth muscle has NT receptor everywhere
  • Action slow (NT diffuses)
21
Q

Cranial Nerves

A
  • 12 pairs of nerves attach to the brain, first to to forebrain, others to brain stem
  • All except Vagus n. (which extends to abdomen) innervate head and neck
22
Q

know the nerves on the brain

A

slide 17 and 18 of PNS

Anatomy (Biol 240) (4 decks)

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