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Central Nervous System. JAMES VALLEY VOCATIONAL TECHNICAL CENTER. Neuron: Nerve Cell. Basic structural unit nervous system Consists of: nucleus nerve fibers /dentrites axon. Nerves. Sensory Nerves: carry messages to brain and spinal cord from body Motor Nerves:

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james valley vocational technical center

Central Nervous System

JAMES VALLEY VOCATIONAL TECHNICAL CENTER

neuron nerve cell
Neuron: Nerve Cell
  • Basic structural unit nervous system
  • Consists of:
    • nucleus
    • nerve fibers /dentrites
    • axon
nerves
Nerves
  • Sensory Nerves:
    • carry messages to brain and spinal cord from body
  • Motor Nerves:
    • carry messages from brain and spinal cord to body
slide4
Connecting or Mixed Nerves:
    • Carry both sensory and motor messages
divisions of cns
Divisions of CNS
  • CNS - central nervous system:
    • consists of brain and spinal cord
slide6
Peripheral Nervous System
    • a. any nerves outside the brain and spinal cord
    • b. Autonomic nervous system: controls involuntary body functions
central nervous system
Central Nervous System
  • 1. Brain:
    • a. Mass of nerve tissue
    • b. Protected by membranes & the cranium or skull
c cerebrum
C. Cerebrum
  • Largest section of the brain
  • Responsible for:
    • reasoning, thought, memory, speaking, sensstion, sight, hearing, voluntary body movement
d cerebellum
D. Cerebellum
  • Responsible for:
    • coordination of muscles, balance, posture, & muscle tone
e midbrain
E. Midbrain
  • Responsible for:
    • conducting impulses between brain parts
    • certain eye reflexes
slide11
Pons
  • Responsible for:
    • conducting messages to other parts of the brain
    • Reflex actions such as chewing, production of saliva
g medulla oblongata
G. Medulla Oblongata
  • Lowest part of brain stem
  • Connects to the spinal cord
  • Responsible for:
    • regulating heart beat, respirations, swallowing, coughing, b/p
2 spinal cord
2. Spinal Cord
  • Goes down back of body from Medulla Oblongata
  • Surrounded and protected by vertebrae
  • Responsible for reflex actions
  • Carries sensory and motor messages
3 meninges
3. Meninges
  • Consists of 3 membranes
  • Covers and protects the brain and spinal cord
three membranes
Three Membranes
  • C. Dura mater
    • thick, tough outer layer
  • D. Arachnoid membrane
    • middle delicate weblike layer
  • E. Pia mater
    • inner most layer with blood vessels to nourish the nerves
4 ventricles
4. Ventricles
  • Four hallow spaces located in the middle of the brain.
  • Connected to each other
  • Filled with fluid called cerebrospinal fluid
cerebrospinal fluid
Cerebrospinal Fluid
  • Circulates continuously
  • Serves as shock absorber to protect brain and spinal cord
slide18
Carries nurients to parts of brain and spinal cord
  • helps remove metabolic products & wastes
  • after circulation, absorbed into the blood vessels of the dura mater.
peripheral nervous system
Peripheral Nervous System
  • Made of all nerves outside the brain and spinal cord
  • Consists of cranial and spinal nerves
a cranial nerves
A. Cranial Nerves
  • 12 pairs & their branches
  • Some responsible for special senses: sight, hearing, taste, smell
  • Others receive sensations: touch, pressure, pain, temperature
b spinal nerves
B. Spinal Nerves
  • 31 pairs & their branches
  • carries messages to & from the spinal cord
  • Both sensory and motor nerves
slide22
31 spinal nerves:
    • 8 cervical
    • 12 thoracic
    • 5 lumbar
    • 5 sacral
    • 1 coccygeal
3 autonomic nervous system
3. Autonomic Nervous System
  • Helps maintain a balance in involuntary functions of the body. But allows the body to react in times of emergency.
2 divisions of ans
Sympathetic nervous system

acts in emergency

Parasympathetic

counter acts the sympathetic ns after the emergency

2 divisions of ANS
slide25
SNS

increase heart rate

increase resp. rate

increase b/p

decrease digestive system activity

PNS

decrease heart rate

decrease resp. rate

decrease b/p

increase digestive system activity

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