Brain and parts
The human brain is the command center for the human nervous system.
it is composed of billions of neurons that communicate together by forming numerous
connections and synapses.
In terms of weight, the average adult human brain weighs in at 1300 to 1400 grams,
just 2% of the body’s total weight.
A human brain isn’t very much bigger – about the size of your two fists put together.
But it’s the most complex thing in the known universe.
It receives signals from the body’s sensory organs and outputs information to the
muscles, embodies the essence of the mind and soul.
The brain receives information through our five senses: sight, smell, touch, taste, and
hearing – often many at one time.
It assembles the messages in a way that has meaning for us, and can store that
information in our memory.
The brain controls our thoughts, memory and speech, movement of the arms and legs,
and the function of many organs within our body.
Composition
The central nervous system (CNS) is composed of the brain and spinal cord.
The peripheral nervous system (PNS) is composed of spinal nerves that branch from
the spinal cord and cranial nerves that branch from the brain.