histo

• Neurons


  Responsible for computation and communication that the nervous system provides
• Classification of Neurons


  • Unipolar
  • Pseudounipolar
  • Bipolar
  • Multipolar
• Astrocyte


  Provides support to neurons of the CNS
• Oligodendrocyte


  Insulates axons in the CNS
• Microglia


  Smaller than most of the other glial cells
• Ependymal Cells


  Cells that filter the blood to make cerebrospinal fluid(CSF)
• Glial Cells


  Cells that maintain the extracellular environment around neurons, improve signal conduction in neurons and protect them from pathogens
• Functions of Nervous Tissue


  • Thermoreceptor
  • Graded potential
  • Threshold
  • Action Potential
  • Acetylcholine
• Initial Segment


  The first section of the axon where an action potential is generated
• Afferent Neurons


  Neurons that carry impulses from peripheral sense receptors to the CNS
• Neural Crest


  A collection of multipotent stem cells
• Notochord


  Essential in the development of the nervous tissue from the ectoderm
• Sonic Hedgehog


  Protein secreted by the notochord that control organogenesis
• Thermoreceptor


  A type of sensory receptor found in the skin that is sensitive to temperature
• Threshold


  The voltage at which an action potential is generated
• Action Potential


  The resulting electrical signal
• Blood-brain barrier (BBB)


  Induced by astrocytes
• Acetylcholine


  The neurotransmitter released at the specialized synapse, and binding to receptors on the muscle cell membrane causes the muscle action potential to begin