Nervous tissues

• Sensory, integration and motor output. - All of our actions, thoughts and emotions can be boiled down into three principal functions
• SENSORY OUTPUT

  • Special Senses

  • Eyes - Sight

  • Nose - Smell

  • Tongue - Taste

  • Ear - Hearing

  • Skin - Touch
• MOTOR OUTPUT

  • Nociception - pain receptor • Temperature

  • Stretch receptor (bladder)
• INTEGRATION

  -The nervous system processes that input and decides what should be done about it.

  -"Fight or flight"
• MOTOR OUTPUT

  The response that occurs when your nervous system activates certain parts of your

  body.
• TWO MAIN CATEGORIES OF NERVOUS SYSTEM

  1. Central Nervous system
  2. Nervous system
• Central Nervous system - brain and spinal cord
• Peripheral Nervous system - Nerves
• Sensory Division / Afferent - picks up sensory stimuli
• Motor Division / Efferent - sends signals from the CNS (brain &spinal

  cord) to the rest of the body
• Somatic - voluntary
• Autonomic - involuntary
• Sympathetic - fight or flight
• Parasympathetic -Heart beat, peristalsis _ (movement of intestine muscles)
• TWO MAIN CELLS

  .1 Neuron

  2. Microglial / Neuroglia / Glial

  cells
• Neuron - receive stimuli

  and send signals
• Microglial / Neuroglia / Glial

  cells- protects, nourishes, insulates and helps the neuron send signals
• GLIALCELLTYPES Central Nervous System

  1.Astrocytes

  2. Microglial cells

  3. Ependymal cells .4 Oligodendrocytes
• PeripheralNervousSystem

  1. Satellite cells
  2. Schwann cells
• ASTROCYTES

  • Most abundant glial cells
• ASTROCYTES

  Anchor neurons to blood supply (capillaries)
• ASTROCYTES

  Allows exchange of ions between neurons and capillaries
• this is ASTROCYTES

  
• MICROGLIAL CELLS

  Provide immune defense for against invading microorganisms in the brain and spinal cord
• this is soma

  
• microglial cells

  
• EPENDYMAL CELLS

  Create, secrete and circulate C S (Cerebrospinal fluid)
• 1. cilia
  2. ependymal cells

  
• OLIGODENDROCYTES

  Produce an insulating barrier called myelin sheath
• SATELLITE CELLS

  Surround and support neuron cell bodies
• 1. satellite cells
  2. nuclei

  
• schwann cells

  Wrap around axons and produce an insulating barrier

  called myelin sheath
• 1. axon
  2. myelin sheath
  3. schwann cells
  4. node ranvier

  
• SOMA

  •Cell body

  • Life support
• SOMA

  Contains organelles such as nucleus and mitochondria
• DENDRITES

  • Pick up signals and convey them to the soma
• AXON

  • Long extension

  • Transmit electrical impulses away from the cell body to the other cells
• 1. dendrites
  2. cell body
  3. supporting cells
  4. axon

  
• this is unipolar

  
• this is bipolar