Download Nervous System functions

Nervous System
Objectives:
1.Identify structures of the nervous
system.
2.Explain differences in the function of
the peripheral nervous system and the
central nervous system.
D. Nervous Tissue
• Nervous tissue is
– found in the brain, spinal cord, and nerves.
– made up of:
1. Neurons: nerve cells (bundles of axons)
2. Neuroglial cells: helper cells
– “glia” = glue
– Support and bind components of nervous tissue to
each other and to blood vessels
– Function similarly to connective tissue in other
organ systems
• Sketch Parts
neuron and
parts.
of label
a Neuron
Nervous System
• Organs of this system are divided into 2
groups:
1. Central Nervous System (CNS)
•
•
Brain
Spinal cord
2. Peripheral Nervous System (PNS)
•
Composed of the nerves (peripheral nerves)
that connect the CNS to other body parts
• Functions of the nervous system:
1. Sensory
2. Integrative
3. Motor
1. Sensory Function
• Sensory receptors at the ends of
peripheral neurons:
– Gather info by detecting changes inside
and outside the body.
• Inside: temperature and oxygen concentration
• Outside: light and sound intensities
– Convert info into nerve impulses
(electrochemical changes) which are
transmitted along peripheral nerves to the
CNS
2. Integrative Function
• Nerve impulses are integrated (brought
together) in the CNS.
• Allows us to make conscious or
subconscious decisions.
3. Motor Function
• Peripheral nerves carry impulses from
the CNS to effectors (responsive
structures).
• Effectors are NOT part of the nervous
system, but include muscles and
glands.
Motor Function
• Motor functions can be divided into 2
groups:
– Somatic nervous system
• Consciously controlled (voluntary)
• Controls skeletal muscle
– Autonomic nervous system:
• Involuntary
• Includes heart, smooth muscle, and various
glands
Nervous System Function
Recap
1. Detects changes inside and outside
the body,
2. Makes decisions based on the
information received, and
3. Stimulates muscles or glands to
respond.
• What is the purpose of this
process?????
Neuroglial Cells
• Functions:
– Fill spaces
– Provide structural frameworks
– Produce myelin
– Carry on phagocytosis
• Vary from CNS to PNS
• Table: Type of Cell, Location, Function,
Other specific info