Divisions of the Nervous System
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Transcript of Divisions of the Nervous System
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Divisions of the Nervous System
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What’s the trend?
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TWO MAJOR DIVISIONS OF THE NERVOUS SYSTEMCNS: Central Nervous System
PNS: Peripheral Nervous System
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1st DIVISION OF THE NERVOUS SYSTEM: CNS
Composed of:A. BrainB. Spinal Cord
Processes info
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CNS
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Ventricles, gray matter, white matter
What is the function of cerebrospinal fluid?
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Not responsible for this, but it’s still cool!
Neurulation
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Major brain structures…
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Brainstem
Midbrain
Pons
Medulla oblongata
•“Primitive” part of the brain
•Controls homeostatic function• Breathing (Pons,
Medulla)• Swallowing (Medulla)• blood vessel activity
(Medulla)
•Acts as a relay between spinal cord and higher brain centers
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Cerebellum
-Coordinates movements and balance
-Hand–eye coordination, learning motor functions (i.e. riding a bike)
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Diencephalon: Thalamus, hypothalamus
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Thalamus, hypothalamus
Thalamus:◦Input center for information going to the
cerebrum◦Motor output for info leaving cerebrum◦Sorts data
Hypothalamus◦Homeostatic control center◦Controls pituitary◦Biological clock
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Cerebrum-Largest part of the human brain
-Associated with higher brain function such as thought and action- Memory- Learning- Speech, emotions
-Information processing/integration: -olfactory -auditory -visual
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2nd DIVISION OF THE NERVOUS SYSTEM: Peripheral Nervous SystemComposed of cranial and spinal nervesDivided in two functional components:
◦A. Motor (Somatic) Nervous System To and from skeletal muscles Generally voluntary Response to external stimuli
◦B. Autonomic Nervous System Parasympathetic & Sympathetic Systems
◦Regulates internal environment (smooth and cardiac muscle, excretory, endocrine)
◦Generally involuntary
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(Somatic Nervous System)
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PNS: Autonomic Nervous System
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PNS: Cranial & Spinal Nerves