Copyright 2010, John Wiley & Sons, Inc. Chapter 15 Sensory, Motor and Integrative Systems.
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Transcript of Copyright 2010, John Wiley & Sons, Inc. Chapter 15 Sensory, Motor and Integrative Systems.
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Copyright 2010, John Wiley & Sons, Inc.
Chapter 15Sensory, Motor and Integrative Systems
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Copyright 2010, John Wiley & Sons, Inc.
Chapter 15: Sensory, Motor and Integrative SystemsThe work of the nervous system requires that information be
collected, processed, and acted upon:
Sensory systems respond to stimuli by sending signals to the CNS
Integrative systems (within the CNS) process and evaluate the sensory information in a process called integration
Motor systems carry signals from the CNS to effectors, and makes sure that motor output is coordinated for efficient responses
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Copyright 2010, John Wiley & Sons, Inc.
Sensory Information: Basic Terminology Some terms used to describe sensory information
Sensory modality refers to the type of sensation (touch, vision, etc.)
The special senses include five key types of sensory input, all originating in the head (smell, taste, vision, hearing, and balance)
The general senses include input from throughout the body Somatic senses (input from skin and musculoskeletal system) Visceral senses (input from internal organs)
Sensation - conscious or subconscious awareness Perception - awareness plus interpretation of sensory
information
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The Process of Sensation■ Four events typically involved when a sensation happens
1.A sensory receptor is stimulated
2.The sensory receptor transduces the sensory stimulus – creating a graded potential in response to a specific type of stimuli
3.The sensory neuron creates one or more nerve impulses which travel toward the CNS
4.Integration of the sensory input occurs in specific regions of the CNS
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Three Structural Classes of Sensory Receptors ■ Sensory receptors vary structurally in how the stimulus is received—by free nerve endings, by encapsulated nerve endings, or by specialized sensory receptor cells
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Copyright 2010, John Wiley & Sons, Inc.
Three Structural Classes of Sensory Receptors
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Classification of Sensory Receptors Classification by
location (at the body surface, inside the body, in muscles and joints)
Classification by the type of stimulus (light, heat, etc)
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Sensory Receptors: Adaptation Most sensory receptors adapt to a constant stimulus, by
decreasing their response and sending fewer action potentials to the CNS Rapidly adapting receptors decrease their responses quickly.
These receptors help the nervous system monitor changes in the environment
Slowly adapting receptors decrease their responses slowly, and continue to send action potentials as long as the stimulus lasts. These receptors help monitor tension in postural muscles, pain, and blood chemistry
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Somatic Sensations
Somatic (“of the body”) sensations arise from body surfaces, muscles and joints Tactile sensations
Thermal sensations
Pain
Proprioception
Somatic sensations arising from the skin are known as cutaneous sensations
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Somatic Sensations
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Tactile Sensations
Tactile receptors in the skin include Corpuscles of touch (also called Meissner corpuscles)
Hair root plexuses
Mechanoreceptors Merkel discs Ruffini corpuscles
Lamellated corpuscles also called Pacinian corpuscles)
Free nerve endings
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Tactile Sensations
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Thermal Sensations
We have two different classes of thermal receptors located in the dermis Cold receptors respond to low temperatures (10–40 C)
Warm receptors respond to a higher temperature range
(32–48C)
Temperatures outside of the ranges above primarily stimulate nociceptors (pain)
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Pain Pain sensations (or just “pain”) is how we learn about
things that are harmful. Pain serves a protective function, since it motivates us to avoid harmful stimuli
Nociceptors are free nerve endings found everywhere in the body (except the brain). Nociceptors have several unusual properties
Nociceptors are activated by multiple types on stimuli
Many chemicals can stimulate nociceptors, and/or sensitize them to other stimuli - in this way pain plays a major role in inflammation
Nociceptors adapt poorly, allowing pain to continue
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Types of Pain Painful sensations can be described by how quickly
they appear, and by where in the body they originate
Fast pain is perceived rapidly (< 0.1 second). Fast pain includes acute, sharp, and prickly sensations.
Slow pain is perceived more slowly (after 1 second or more), and gradually increases in intensity. Slow pain includes chronic, burning, aching, and throbbing sensations.
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Types of Pain Superficial somatic pain arises from nociceptors in the skin
Deep somatic pain arises from nociceptors in muscles, joints, tendons, ligaments, and fascia
Visceral pain arises from stimulation of nociceptors in visceral organs
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Localization of Pain Fast pain is precisely localized - we know exacty where
the stimulus is Slow pain has a more general localization - we can only
localize the stimulus to a broader region of the body In referred pain, the pain is perceived to arise from
surface tissues that share neural pathways with the visceral source of the pain
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Localization of Pain
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Proprioception Proprioceptive sensations allow us an awareness of
where our head and limbs are, and where they are going; these sensations are critical for the precise control of body movements
Proprioceptors inform us about several categories of mechanical stimuli
The degree to which muscles are stretched The tension in tendons, and the position of our joints The position and movements of our head
Proprioceptors adapt only slightly, and feedback from propriceptors allows us to adjust our movements to match changing physical challenges
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Muscle Spindles Muscle spindles are proprioceptors located within
skeletal muscles
The length of the muscl is monitored
Muscle spindles are involved in the stretch reflex, and help maintain muscle tone
Muscle spindles contain a mechanism for maintaining their own level of tension - this ensures sensitivity at all muscle lengths
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Muscle Spindles
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Other Proprioceptors Tendon organs are located where tendons meet
muscle The level of tension in the tendon is monitored Excessive tension results in reflexive muscle relaxation,
protecting the muscle from damage
Joint kinesthetic receptors (not shown) are located within and around synovial joint capsules These receptors provide feedback on joint position
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Other Proprioceptors
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Somatic Sensory “Map” in the Cerebral Cortex The primary somatosensory area is in the postcentral
gyrus of the parietal lobe Body regions are “mapped” to specific regions Extensive sensory input from some regions (e.g., lips,
hands) results in larger cortical regions representing them
The left side of the body maps to the right cerebral cortex, and vice versa
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Copyright 2010, John Wiley & Sons, Inc.
Somatic Sensory “Map” in the Cerebral Cortex
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Somatic Motor “Map” in the Cerebral Cortex The primary motor area is in the precentral gyrus of the
frontal lobe
Major region for control of voluntary movements
Larger cortical areas exist for detailed motor control
Just anterior to the primary motor area is the premotor area of the frontal lobe
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Copyright 2010, John Wiley & Sons, Inc.
Somatic Motor “Map” in the Cerebral Cortex
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Somatic Sensory Pathways Somatic sensory pathways carry information from the
body to the somatosensory cortex, and to the cerebellum Sets of three neurons carry information along the
pathways First-order neurons carry signals as far as the spinal cord or
brainstem
Second-order neurons carry signals on to the thalamus
Third-order neurons travel from the thalamus to the cerebral cortex
CNS regions where the three neurons synapse with each other are know as relay stations - these include the spinal cord, regions of the brainstem, and the thalamus
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Sensory Pathways: The Posterior Column Pathway This pathway carries information from touch, vibration, and proprioceptors First-order neurons travel via the posterior column of the spinal
cord to the medulla oblongata
Second-order neurons cross to the opposite side of the medulla, then ascend via the medial lemniscus to the thalamus
Third-order neurons project from the thalamus to the cerebral cortex
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Sensory Pathways:The Posterior Column Pathway
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Sensory Pathways: The Anterolateral Pathway
This pathway carries information for pain, temperature, itch, and tickle sensations First-order neurons travel to the spinal cord and synapse in
the posterior gray horn
Second-order neurons cross to the opposite side of the spinal cord, then ascend in the spinothalamic tract to the thalamus
Third-order neurons project from the thalamus to the cerebral cortex
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Sensory Pathways:The Anterolateral Pathway
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Somatic Sensory PathwaysInteractions Animation
Somatic Sensory Pathways
You must be connected to the internet to run this animation.
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Sensory Pathways to the Cerebellum The cerebellum helps us maintain our balance and posture, and execute skilled movements - all requiring extensive input from proprioceptors
Input to the cerebellum is not consciously perceived Input to the cerebellum travels via two pathways
Posterior spinocerebellar tract Anterior spinocerebellar tract
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Sensory Pathways to the Cerebellum
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Somatic Motor Pathways Skeletal muscles are innervated by lower motor
neurons, located in either the spinal cord or the brainstem
Axons of lower motor neurons travel via either spinal nerves or cranial nerves to reach the muscles they innervate
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Somatic Motor Pathways Many other neurons help determine the activity of lower
motor neurons
Local circuit neurons help control rhythmic activities
Upper motor neurons help maintain muscle tone, posture and balance
Basal nuclei neurons help begin and end movements
Cerebellar neurons helps coordinate the actions of different muscles
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Upper Motor Neuron Pathways
Direct motor pathways descend from the cerebral cortex to lower motor neurons
Lateral corticospinal tract
Anterior corticospinal tract
Corticobulbar tract
Indirect motor pathways (not shown) descend from the brainstem
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Upper Motor Neuron Pathways
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Modulation of Movement by the Basal Nuclei The basal nuclei play a key role in the initiation and
termination of movements: They receive input from various cortical areas They provide feedback to the motor cortex (by way of the thalamus) They also help suppress unwanted movements, and influence
muscle tone
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Sagittalplane
Motor areas ofcerebral cortex
Thalamus
Correctivefeedback
Motor centers inbrainstem
Pons
Pontine nuclei
Direct pathways
Indirect pathways
Signals to lowermotor neurons
Sagittal section through brain and spinal cord
Sensory signals fromproprioceptors in musclesand joints, vestibularapparatus, and eyes
Cortex ofcerebellum
1
Sagittalplane
Motor areas ofcerebral cortex
Correctivefeedback
Pons
Direct pathways
Indirect pathways
Signals to lowermotor neurons
Sagittal section through brain and spinal cord
Sensory signals fromproprioceptors in musclesand joints, vestibularapparatus, and eyes
Cortex ofcerebellum
1
2
Thalamus
Motor centers inbrainstem
Pontine nuclei
Sagittalplane
Motor areas ofcerebral cortex
Correctivefeedback
Pons
Direct pathways
Indirect pathways
Signals to lowermotor neurons
Sagittal section through brain and spinal cord
Sensory signals fromproprioceptors in musclesand joints, vestibularapparatus, and eyes
Cortex ofcerebellum
1
2
3
Thalamus
Motor centers inbrainstem
Pontine nuclei
Sagittalplane
Motor areas ofcerebral cortex
Correctivefeedback
Pons
Direct pathways
Indirect pathways
Signals to lowermotor neurons
Sagittal section through brain and spinal cord
Sensory signals fromproprioceptors in musclesand joints, vestibularapparatus, and eyes
Cortex ofcerebellum
1
2
4
3
Thalamus
Motor centers inbrainstem
Pontine nuclei
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Modulation of Movement by the Cerebellum The cerebellum helps us maintain posture and balance, as well as learn complex motor skills
Four steps in cerebellar activity
1. Monitors intentions for movement
2. Monitors actual movement
3. Compares command signals with sensory information
4. Sends out corrective feedback
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Modulation of Movement by the Cerebellum
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Integrative Functions: Wakefulness and Sleep Our sleep-wake cycles are connected to a 24-hour
circadian rhythm which originates in the hypothalamus The reticular activating system (RAS) is a diffuse series of
brainstem nuclei that help us transition between sleep and being awake
The state of wakefulness is also referred to as consciousness Sleep is a state of partial unconsciousness from which we can be
aroused
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Integrative Functions: Wakefulness and Sleep
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Integrative Functions: Learning and Memory Learning is the acquisition of new information or skills - we learn by instruction or experience
Memory is the process of storing and retrieving the information we learn
Memory must involve structural and functional changes in brain neurons
Areas of the brain involved in memory include association areas, the thalamus and hypothalamus, and parts of the limbic system
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Integrative Functions: Memory Occurs in Stages Memory occurs in several stages, over distinct time
periods
Immediate memory gives us knowledge of our current surroundings (duration: one to a few seconds)
Short-term memory allows immediate recall of information (duration: seconds to minutes)
Long-term memory allow retrieval of much older information (duration: days to years)
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Integrative Functions: Memory Occurs in Stages Memories for complex motor skills are a special
category of long-term memory, and seem to be stored in the basal nuclei and cerebellum in addition to the cerebral cortex
A number of clinical conditions disrupt retention of recent memory, and in the worst cases can result in amnesia
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End of Chapter 15
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