nervous system outline
Download
Skip this Video
Download Presentation
Nervous System Outline

Loading in 2 Seconds...

play fullscreen
1 / 32

Nervous System Outline - PowerPoint PPT Presentation


  • 85 Views
  • Uploaded on

Nervous System Outline. Health Occupations. Nervous System Functions. Directs the functions of all human body systems 100 Billion Nerve cells Carry messages from brain to rest of body. Neurons . The basic element of nervous system Highly specialized Vary in function, shape, and size

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Nervous System Outline' - cassia


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
nervous system outline

Nervous System Outline

Health Occupations

nervous system functions
Nervous System Functions
  • Directs the functions of all human body systems
    • 100 Billion Nerve cells
  • Carry messages from brain to rest of body
neurons
Neurons
  • The basic element of nervous system
  • Highly specialized
  • Vary in function, shape, and size
  • Separated by synapses
    • Gaps in between each neuron
  • Neurotransmitters
    • Stimulates impulse to jump to next nerve
neurons1
Neurons
  • 3 Parts
    • Cell Body
      • Have fibers to reach out to send or

receive impulses

    • Dendrites
      • Thin branching extensions of cell body
      • Conduct nerve impulses to cell body
    • Axon
      • Conducts nerve impulses away from cell body
      • Covered by a myelin sheath
        • Fatty tissue that makes impulse travel faster
      • End of axon has fibers that let the impulse leave the nerve
neurons2
Neurons
  • 2 Basic Properties
    • Excitability
      • Ability to respond to a stimulus
    • Conductivity
      • Ability to transmit a signal
neurons3
Neurons
  • 3 Types
    • Efferent (motor)
      • Carry information to muscles and glands from CNS
    • Afferent (sensory)
      • Carry information from sensory system to CNS
    • Interneurons
      • Carry and process sensory information
slide10
Neuron bundles = Nerves
  • Stimulus Receptor Impulse

Nerve Receptor

neuroglias
Neuroglias
  • Support, connect, protect, and remove debris
  • Do not transmit impulses
  • Form blood-brain barrier
    • Permits some chemical substances to reach the brain’s neurons but blocks most others
central nervous system cns
Central Nervous System (CNS)
  • Consists of:
    • Brain
    • Spinal cord
  • Center of Control
cns functions
CNS Functions
  • Receives and interprets all stimuli
  • Sends nerve impulses to instruct muscles and glands to take over or respond to certain actions
  • Causes Voluntary and Involuntary actions
brain divisions
Brain Divisions
  • Brainstem
  • Cerebellum
  • Cerebrum
  • Diencephalon
brain stem
Brain Stem
  • Midbrain
    • Visual reflexes
  • Pons
    • Controls certain respiratory functions
  • Medulla Oblongata
    • Regulates heart & lung functions
    • Swallowing
    • Vomiting
    • Coughing
    • sneezing
cerebellum
Cerebellum
  • Coordinates musculoskeletal movement
    • Maintains balance
    • Posture
    • Muscle tone
cerebrum
Cerebrum
  • 2 hemispheres
    • Left and Right
  • Cerebral Cortex
    • Conscious decision making
  • Four Lobes
    • Frontal
      • Moral Behavior, voluntary motor movements
    • Parietal
      • Controls and interprets senses and taste
    • Temporal
      • Memory, equilibrium, emotion, hearing
    • Occipital
      • vision
diencephalon
Diencephalon
  • Deep portion of brain
  • Contains:
    • Thalamus
    • Hypothalamus
  • Relay center for sensations
  • Controls:
    • Heart rate
    • Blood pressure
    • Temperature regulation
    • Water and electrolyte balance
    • Digestive functions
    • Glandular activities
cerebrospinal fluid csf
Cerebrospinal Fluid (CSF)
  • Fills the area between the brain and cranium
  • Watery fluid that contains various compound
  • Cradles and cushions brain
spinal cord
Extends from base of brain to first lumbar vertebrae in back

Protected by:

Cerebrospinal fluid

Vertebral column

Meninges

3 layers of membranes that cover brain and spinal cord

Spinal Cord
meninges
Meninges
  • Dura Mater (outer layer)
    • Tough, fibrous
    • Contains channels for blood to enter brain tissue
  • Arachnoid Mater (middle layer)
    • Web-like structure
  • Pia Mater (innermost layer)
    • Contains blood vessels that nourish spinal cord
peripheral nervous system
Peripheral Nervous System
  • 12 Cranial Nerves
    • Carry impulses to and from the brain
  • 31 pairs of spinal nerves
    • Carry messages to and from the spinal cord and the torso and extremities of the body
peripheral nervous system1
Peripheral Nervous System
  • 2 Subsystems according to function
    • Somatic Nervous System
    • Autonomic Nervous System
somatic nervous system
Somatic Nervous System
  • Receive and process sensory input from the skin, muscles, tendons, joints, eyes, tongue, nose and ears
  • Excite voluntary contraction of skeletal muscles
autonomic nervous system
Autonomic Nervous System
  • Carry impulses from the central nervous system to glands, various involuntary muscles, cardiac muscle, and membranes
  • Stimulates organs, glands and senses by stimulating secretions of substances
  • Divided into sympathetic and parasympathetic divisions
autonomic nervous system1
Autonomic Nervous System
  • Sympathetic
    • Operates when the body is under stress
    • Activates responses necessary to react in dangerous or abnormal situations
    • Fight or Flight response
  • Parasympathetic
    • Operates to keep the body in homeostasis under normal conditions
ad