good morning! take out your notes and vocab...
TRANSCRIPT
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Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Good Morning!
Take out your notes and
vocab 1-10!
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Functions of the Nervous System
Slide 7.1aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
1. Sensory input – gathering information
To monitor changes occurring inside and outside the body (changes = stimuli)
2. Integration –
to process and interpret sensory input and decide if action is needed.
3. Motor output
A response to integrated stimuli
The response activates muscles or glands
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Structural Classification of the Nervous System
Slide 7.2Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Central nervous system (CNS)
Brain
Spinal cord
Peripheral nervous system (PNS)
Nerve outside the brain and spinal cord
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Functional Classification of the Peripheral Nervous System
Slide 7.3aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Sensory (afferent) division
Nerve fibers that carry information to the
central nervous system
Figure 7.1
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Functional Classification of the Peripheral Nervous System
Slide 7.3bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Motor (efferent) division
Nerve fibers that carry impulses away from
the central nervous system
Figure 7.1
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Functional Classification of the Peripheral Nervous System
Slide 7.3cCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Motor (efferent) division
Two subdivisions
Somatic nervous system = voluntary
Autonomic nervous system = involuntary
Figure 7.1
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Organization of the Nervous
System
Slide 7.4Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 7.2
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Neuroglia vs. Neurons
• Neuroglia divide.
• Neurons do not.
• Most brain tumors are “gliomas.”
• Most brain tumors involve the neuroglia
cells, not the neurons.
• Consider the role of cell division in cancer!
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Nervous Tissue: Support Cells (Neuroglia or Glia)
Slide 7.5Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Astrocytes
Abundant, star-shaped cells
Brace neurons
Form barrier between capillaries and neurons- Blood brain Barrier
Control the chemical environment of the brain (CNS)
Figure 7.3a
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Blood Brain Barrier
Slide 7.48Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Includes the least permeable capillaries of the body
Excludes many potentially harmful substances
Useless against some substances
Fats and fat soluble molecules
Respiratory gases
Alcohol
Nicotine
Anesthesia
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Nervous Tissue: Support Cells
Slide 7.6Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Microglia (CNS)
Spider-like phagocytes
Dispose of debris
Ependymal cells (CNS)
Line cavities of the brain and spinal cord
Circulate cerebrospinal fluid
Figure 7.3b, c
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Cerebrospinal Fluid
Slide 7.46Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Similar to blood plasma composition
Formed by the choroid plexus
Forms a watery cushion to protect the brain
Circulated in arachnoid space, ventricles, and central canal of the spinal cord
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Nervous Tissue: Support Cells
Slide 7.7aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Oligodendrocytes
(CNS)
Produce myelin
sheath around
nerve fibers in the
central nervous
system Figure 7.3d
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Nervous Tissue: Neurons
Slide 7.8Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Neurons = nerve cells
Cells specialized to transmit messages
Major regions of neurons
Cell body – nucleus and metabolic center of the cell
Processes – fibers that extend from the cell body (dendrites and axons)
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Neuron Anatomy
Slide 7.9bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Cell body
Nucleus
Large nucleolus
Figure 7.4a
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Neuron Anatomy
Slide 7.10Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Extensions outside the cell body
Dendrites –conduct impulses toward the cell body
Axons – conduct impulses away from the cell body (only 1!)
Figure 7.4a
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Axons and Nerve Impulses
Slide 7.11Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Axons end in axonal terminals
Axonal terminals contain vesicles with neurotransmitters
Axonal terminals are separated from the next neuron by a gap
Synaptic cleft – gap between adjacent neurons
Synapse – junction between nerves
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Nerve Fiber Coverings
Slide 7.12Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Schwann cells –produce myelin sheaths in jelly-roll like fashion
Nodes of Ranvier –gaps in myelin sheath along the axon
Figure 7.5
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Application
• In Multiple Scleroses the myelin sheath is
destroyed.
• The myelin sheath hardens to a tissue called
the scleroses.
• This is considered an autoimmune disease.
• Why does MS appear to affect the muscles?
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Neuron Cell Body Location
Slide 7.13Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Most are found in the central nervous system
Gray matter – cell bodies and unmylenated fibers
Nuclei – clusters of cell bodies within the white matter of the central nervous system
Ganglia – collections of cell bodies outside the central nervous system
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Functional Classification of
Neurons
Slide 7.14a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Sensory (afferent) neurons
Carry impulses from the sensory receptors
Cutaneous sense organs
Proprioceptors – detect stretch or tension
Motor (efferent) neurons
Carry impulses from the central nervous system
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Functional Classification of
Neurons
Slide 7.14b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Interneurons (association neurons)
Found in neural pathways in the central nervous system
Connect sensory and motor neurons
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Neuron Classification
Slide 7.15Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 7.6
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How Do Neurons Operate?
• Neuron at Rest Resting Potential
– Occurs when the neuron is at rest.
– A condition where the outside of the membrane is positively(+)
charged compared to the inside which is negatively(-) charged.
– Neuron is said to be polarized.
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Starting a Nerve Impulse
Slide 7.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Depolarization – a stimulus causes sodium (Na+) to flow inside the axon
The exchange of ions initiates an action potential in the neuron
Called depolarization
Figure 7.9a–c
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The Action Potential
Slide 7.19Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
If the action potential (nerve impulse) starts, it is propagated over the entire axon
After depolariztion Potassium ions rush out of the neuron after sodium ions rush in, which repolarizes the membrane
The sodium-potassium pump restores the original configuration
This action requires ATP
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Nerve Impulse Propagation
Slide 7.20Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
The impulse continues to move toward the cell body
Impulses travel faster when fibers have a myelin sheath
Figure 7.9c–e
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Refractory Period
• Brief period of time between the triggering
of an impulse and when it is available for
another.
– NO NEW action potentials can be created
during this time.
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Continuation of the Nerve Impulse between Neurons
Slide 7.21Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Impulses are able to cross the synapse to another nerve
Neurotransmitter is released from a nerve’s axon terminal
The dendrite of the next neuron has receptors that are stimulated by the neurotransmitter
An action potential is started in the dendrite
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How Neurons Communicate at Synapses
Slide 7.22Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 7.10
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The Reflex Arc
Slide 7.23Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Reflex – rapid, predictable, and involuntary responses to stimuli
Reflex arc – direct route from a sensory neuron, to an interneuron, to an effector
Figure 7.11a
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Simple Reflex Arc
Slide 7.24Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 7.11b, c
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Types of Reflexes and Regulation
Slide 7.25Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Autonomic reflexes
Smooth muscle regulation
Heart and blood pressure regulation
Regulation of glands
Digestive system regulation
Somatic reflexes
Activation of skeletal muscles
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The Meninges
Dura mater - outermost layer
Arachnoid mater - no blood vessels, in between layer (resembles a spider web)
Pia mater -inner membrane, contains nerves and blood vessels to nourish cells
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The Meninges
Figure 13.25a
CSF = cerebrospinal fluid
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Dura mater is being peeled away in this photo.
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Regions of the Brain
Slide 7.27Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Cerebral hemispheres
Diencephalon
Brain stem
CerebellumFigure 7.12
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Cerebral Hemispheres (Cerebrum)
Slide 7.28a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Paired (left and right) superior parts of the brain
Include more than half of the brain mass
Figure 7.13a
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Cerebral Hemispheres (Cerebrum)
Slide 7.28b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
The surface is made of ridges (gyri) and grooves (sulci)
Figure 7.13a
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Layers of the Cerebrum
Slide 7.33a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Gray matter
Outer layer
Composed mostly of neuron cell bodies, glial cells and unmyelinated axons.
White Matter
axons and connections between neurons
Figure 7.13a
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Lobes of the Brain (general functions)
Frontal – reasoning, thinking, language
Parietal – touch, pain, relation of body parts (somatosensory)
Temporal Lobe –hearing, taste
Occipital – vision
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Frontal Lobe
• Prefrontal cortex: abstract
intellectual functions
• Gustatory cortex: taste
• Primary motor cortex:
direct voluntary
movement
• Premotor cortex:
coordinating learned
movements
• Speech center Broca’s
area (left hemisphere)
processes the breathing
and vocalization patterns
required to speak
• Damage cause difficulty
speaking or speaking the
wrong words even when
you know exactly what
you want to say.
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Parietal and Occipital
• Primary sensory cortex:
• Touch, pressure, pain and
temperature receptors
• Somatic Sensory
association area:
recognize different types
of touch
• Visual Cortex/ Visual
association area:
• Visual stimuli and
process images
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Temporal Lobe:• Auditory and Olfactory
cortex:
• Sound and Smell
• Left temporal lobe:
general interpretive area
recieves information from
all association areas and
processes information
expecially sound
• Damage to G.I.A:
cause inability to
process the meanings
of words put together.
• AKA Wernicke’s
area
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Diencephalon
Slide 7.34a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Sits on top of the brain stem
Enclosed by the cerebral hemispheres
Made of three parts
Thalamus
Hypothalamus
Epithalamus
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Thalamus
Slide 7.35Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Surrounds the third ventricle
The relay station for sensory impulses
Transfers impulses to the correct part of the cortex for localization and interpretation
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Hypothalamus
Slide 7.36a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Under the thalamus
Important autonomic nervous system center
Helps regulate body temperature
Controls water balance
Regulates metabolism
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Hypothalamus
Slide 7.36b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
An important part of the limbic system (emotions)
The pituitary gland is attached to the hypothalamus
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Epithalamus
Slide 7.37Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Forms the roof of the third ventricle
Houses the pineal body (an endocrine gland)
Includes the choroid plexus – forms cerebrospinal fluid
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Brain Stem
Slide 7.38a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Attaches to the spinal cord
Parts of the brain stem
Midbrain
Pons
Medulla oblongata
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Midbrain
Slide 7.39Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Mostly composed of tracts of nerve fibers
Reflex centers for vision and hearing
Cerebral aquaduct – 3rd-4th ventricles
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Pons
Slide 7.40Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
The bulging center part of the brain stem
Mostly composed of fiber tracts
Includes nuclei involved in the control of breathing
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Medulla Oblongata
Slide 7.41Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
The lowest part of the brain stem
Merges into the spinal cord
Includes important fiber tracts
Contains important control centers
Heart rate control
Blood pressure regulation
Breathing
Swallowing
Vomiting
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Cerebellum
Slide 7.43a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Two hemispheres with convoluted surfaces
Provides involuntary coordination of body movements
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Cerebellum
Slide 7.43b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 7.15a
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Ventricles and Location of the Cerebrospinal Fluid
Slide 7.47a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 7.17a
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Ventricles and Location of the Cerebrospinal Fluid
Slide 7.47b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 7.17b
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Structure of a Nerve
Slide 7.56Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Endoneurium surrounds each fiber
Groups of fibers are bound into fascicles by perineurium
Fascicles are bound together by epineurium
Figure 7.20
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Development Aspects of the Nervous System
Slide 7.75a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
The nervous system is formed during the first month of embryonic development
Any maternal infection can have extremely harmful effects
The hypothalamus is one of the last areas of the brain to develop
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Development Aspects of the Nervous System
Slide 7.75b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
No more neurons are formed after birth, but growth and maturation continues for several years (new evidence!)
The brain reaches maximum weight as a young adult
However, we can always grow dendrites!