Nervous System

Topics: Neuron, Nervous system, Axon Pages: 4 (916 words) Published: July 7, 2013
nThe nervous system
- sensory input: information gathered by sensory receptors about internal and external changes. - Integration: interpretation of sensory input
- motor output: activation of effector organs.

Organization of the nervous system
Structural classification
- central nervous system
- brain and spinal cord
- integration and command center
- peripheral nervous system
- paired spinal and cranial nerves carry messages to brain

Peripheral nervous system
- two functional divisions
1. Sensory division : somatic after end fibers which conveys impulses from skin, skeletal muscles and joints. Visceral affront fibers conveys impulses from visceral organs 2. Motor division : transmits impulses from the CNS to effector organs.

Motor division of PNS
1. Somatic nervous system : conscious control of our skeletal muscles 2. Autonomic nervous system : visceral motor nerve fibers, regulates smooth, Cardiac and glands Two functional subdivisions : sympathetic & parasympathetic

Nervous tissue : structure and function
Supporting cells
- supporting cells in the CNS are "lumped together" as neuralgia.

1. Astrocytes
- star shaped
- most abundant, versatile, highly branched glial cells
- cling to neurons and synaptic endings
- support and brace neurons
- help determine capillary and neurons
2. Microglia
- small spider like cells with thorny processes
- migrate toward injured neurons
- disposes debris
3. Ependymal cells
- may be ciliated
- line the central cavities of the brand and spinal column - for, protective cushion around CNS
4. Oligodendrocytes
- branched cells
- processes wrap CNS nerve fibers, forming insulating myelin sheaths

- satellite cells: surround cell bodies in the PNS and has protective cushioning cells - schwann cells: surrounds peripheral nerve fibers and form myelin sheaths and nerve fibers that are found In the PNS....
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay on A Description of the Nervous System
  • Nervous System Essay
  • Essay on Nervous System Study Guide
  • Essay about Ans Nervous System
  • Human Nervous System Essay
  • Nervous Systems, Function and Survival Essay
  • Essay on Nervous System (Science Report)
  • Nervous System Essay

Become a StudyMode Member

Sign Up - It's Free