Nervous system
• The task of nervous system is to Neurotransmitter
coordinate the mental processes s
by which we perceive, act, learn Neuropeptides
and remember.
• The human brain is a network
of billions of individual nerve
cells interconnected in systems
that construct our perceptions
of the external world, fix our
attention, and control the
machinery of our actions.
• The nervous system has two
classes of cells: nerve cells
(neurons) and glial cells (glia).
,
, Supporting Cells (Neuroglial Cells)
in the CNS
• Neuroglia – usually only refers to
supporting cells in the CNS, but can be used
for PNS
–Glial cells have branching processes and a
central cell body
–Outnumber neurons 10 to 1 (the guy on the right
had an inordinate amount of them).
–Make up half the mass of the brain
–Can divide throughout life
, Glial cells
• Glial cells are support cells.
• They are more in number than neurons.
• There are between 10 and 50 times more glia than neurons in the brain of humans.
• The name for these cells derives from the Greek word for glue. In actual terms, the
glia do not commonly hold nerve cells together but surround the neurons.
• The task of nervous system is to Neurotransmitter
coordinate the mental processes s
by which we perceive, act, learn Neuropeptides
and remember.
• The human brain is a network
of billions of individual nerve
cells interconnected in systems
that construct our perceptions
of the external world, fix our
attention, and control the
machinery of our actions.
• The nervous system has two
classes of cells: nerve cells
(neurons) and glial cells (glia).
,
, Supporting Cells (Neuroglial Cells)
in the CNS
• Neuroglia – usually only refers to
supporting cells in the CNS, but can be used
for PNS
–Glial cells have branching processes and a
central cell body
–Outnumber neurons 10 to 1 (the guy on the right
had an inordinate amount of them).
–Make up half the mass of the brain
–Can divide throughout life
, Glial cells
• Glial cells are support cells.
• They are more in number than neurons.
• There are between 10 and 50 times more glia than neurons in the brain of humans.
• The name for these cells derives from the Greek word for glue. In actual terms, the
glia do not commonly hold nerve cells together but surround the neurons.
