What are the functions of the nervous system?
What is somatosensation?
Where are receptor cells for somatosensation found?
Widely distributed around body tissues
What are the special senses?
What is the process of sensory transduction?
Conversion of environmental stimuli into electrical energy by receptor cells
What type of stimulus does the Pacinian corpuscle respond to?
Vibration (mechanical stimulus)
What opens the Na+ channels in the Pacinian corpuscle?
Mechanical stimulus (vibration)
What is a generator potential?
Local, graded depolarization in receptor cell triggered by a stimulus
What happens if the generator potential is strong enough?
Triggers action potential in receptor cell
What do receptive fields represent?
Area on skin/body where a stimulus changes a neuron's activity
What does the labeled line theory state?
Each neuron relays one specific type of information to a specific brain region
What is a caveat of the nervous system's processing?
Complex processing results in limited, filtered information reaching the cortex
What does the somatosensory system encode?
Stimulus intensity and location on the body
What are the types of receptors in the skin?
What is adaptation in the context of neurons?
Progressive decrease in neuron’s response with continuous stimuli.
What are phasic receptors?
Receptors that show adaptation and signal the 'on' and 'off' of a stimulus.
What are tonic receptors?
Receptors with little or very slow adaptation, signaling stimulus duration.
What is the Dorsal Column Pathway responsible for?
Touch, pressure, and vibration.
What are the stages in the Dorsal Column Pathway?
What is the Spinothalamic Tract responsible for?
Pain, temperature, itch, and tickle.
What are the stages in the Spinothalamic Tract?
What is the Primary Somatosensory Cortex (S1)?
The first cortical region where touch information is received and processed.
How is the Primary Somatosensory Cortex organized?
Somatotopically organized, mapping the opposite side of the body.
What is a sensory homunculus?
A disproportionate map of body regions based on receptor cell density.
What is central modulation of sensory information?
Higher brain areas suppress some sensory input and amplify others.
What are reciprocal connections in sensory processing?
Connections between thalamus and cortex that allow modification of information relay.
What happens in nonprimary sensory cortical areas?
Different aspects of sensory experiences are processed.
What is the first step in sensory information processing?
Sensory information enters the CNS through the brainstem or spinal cord.
What does the thalamus do with sensory information?
Shares information with the cerebral cortex.
How does the cortex affect sensory input?
Directs the thalamus to suppress some sensations.
What are the reciprocal connections between thalamus and cortex?
Cortex modifies which information thalamus relays to it.
What is the role of nonprimary sensory cortical areas?
Process different aspects of sensory experience.
What happens to S1 after a limb loss?
S1 reorganizes to represent other body parts.
What is the effect of transplanted hand on S1?
S1 reorganizes in a few months for sensation perception.
How do professional musicians differ in S1 representation?
They have a larger S1 hand area than non-musicians.
What changes occur in S1 with fine motor skill learning?
Changes the S1 maps.
How is pain defined?
An unpleasant sensory and emotional experience.
What are the components of pain experience?
What is the evolutionary role of pain?
It is an evolutionarily adaptive perception.
What are nociceptors?
Receptors that detect noxious stimuli.
What does the cortical pain network include?
S1, S2, insula, anterior cingulate cortex.
What are tors?
Receptors that detect noxious (potentially damaging) stimuli.
What is involved in pain perception?
Activity in a network of regions in the cerebral cortex.
What is the corical pain network?
S1, S2, insula, anterior cingulate cortex (ACC), prefrontal cortex (PFC).
What is the main pain pathway to the cortex?
STT (spinothalamic tract).
How many additional pain pathways exist?
At least 5 additional pathways.
What is the role of neural circuits in pain?
They inhibit pain at multiple levels in the nervous system.
What psychosocial factor releases endogenous opioids?
Stress.
What effect does expectation have on pain?
Releases endogenous opioids (placebo effect).
What can hypnotic suggestion do regarding pain?
Produce perception of pain without stimulating skin.
What is chronic pain?
Pain that persists in the absence of injury or tissue damage.
What is the effect of chronic pain on the brain?
Alters brain structure and function.
What is a common treatment using opiates?
Act on endogenous opioid receptors, especially in the midbrain periaqueductal gray.
What are examples of non-opiate drugs for pain?
NSAIDs, marijuana.
What does TENS stand for?
Transcutaneous electrical nerve stimulation.
What is the effect of acupuncture on pain?
Partially due to release of endogenous opioids (endorphins).
What is the role of the prefrontal cortex in behavior?
Analyzes sensory information and selects appropriate behavior.
What is the function of tendons?
Connective tissue structures that attach muscle to bone.
How are muscle fibers controlled?
Innervated by motor neurons that trigger contraction.
What are the types of movement?
Reflexes and acts (complex behaviors).
What is a reflex?
Simple, automatic, unlearned responses to sensory stimuli.
What is required for complex behaviors?
Motor plans/motor programs in the motor areas of the cerebral cortex.
What behaviors require motor plans?
Where are motor plans organized?
In the motor areas of the cerebral cortex
What is the flow of information in the cortex?
PFC → Limbic → Primary sensory areas → Sensory association areas → Multimodal association areas → Nonprimary motor cortex → Primary motor cortex → Muscles contract
What does the PFC choose?
The behavior
What are the nonprimary motor areas responsible for?
Putting together motor plans
What is the role of the SMA?
Initiation of preprogrammed plans
What does the PMC control?
Groups of motor behaviors such as defensive movements and feeding behaviors
What does the Primary Motor Cortex (M1) do?
Relays instructions for voluntary movements to motor neurons in the spinal cord and brainstem
What is the pyramidal/corticospinal system?
A 2-neuron descending pathway from M1 to muscles
What happens to M1 neurons in the medulla?
Axons decussate
What is M1 somatotopically organized as?
The motor homunculus
What is neuroplasticity in M1?
Remapping occurs with training or lack of use
What does the cerebellum do?
Compares intended with actual movement and sends correction signals
What is the role of the basal ganglia?
Ensures smooth initiation and control of movements
What happens with cerebellar damage?
What are the symptoms of Parkinson’s disease?
What is Huntington’s disease characterized by?
What do proprioceptors in muscles do?
Inform the brain about muscle stretch and tension
What does a muscle spindle do?
Activated when muscle is stretched, informs brain about stretch
What does a Golgi tendon organ monitor?
The tension on the muscle and warns of overload
What is proprioception?
The sense of body position in space
What is a muscle spindle?
Embedded in muscle fibers; activated when muscle is stretched; informs brain about stretch amount.
What does the Golgi tendon organ do?
Embedded in tendons; informs brain of muscle tension; monitors force of contractions; warns of overload.
What is closed-loop motor control?
Sensory feedback maximizes accuracy during movement.
What is open-loop motor control?
Maximizes speed with no feedback; used for well-learned movements.
What are the two control mechanisms for movements?
Closed-loop and open-loop motor control.
What do proprioceptors do?
Provide sensory feedback about body position and movement.
What do free nerve endings detect?
Pain and temperature.
What do Meissner’s corpuscles detect?
Touch.
What do Pacinian corpuscles detect?
Vibration and pressure.
What do Ruffini corpuscles detect?
Stretch.
What happens during a weak stimulus?
Shows increasing response until threshold is reached, triggering an action potential.
What is the role of the thalamus?
Acts as a relay station for sensory information to the primary somatosensory cortex.
Where does sensory information enter the CNS?
Through the brainstem or spinal cord, then travels to the thalamus.
What is the primary somatosensory cortex?
Region of the brain that processes sensory input from the body.
What is the function of afferent nerve endings?
Transmit sensory information to the CNS.
What is the hierarchy of motor control?
Organizes the process of motor functions in the nervous system.
What is the role of cortical cells in response to stimuli?
Respond to stimulation with varying intensities and patterns.
What do sensory receptors do?
Detect environmental changes and transmit information to the nervous system.
What is the function of the peripheral nervous system (PNS)?
Connects the CNS to limbs and organs, transmitting sensory and motor signals.
What does the central nervous system (CNS) consist of?
The brain and spinal cord.
What is the response to a moderate stimulus?
Increases generator potential, leading to action potential if threshold is reached.
What is the response to a strong stimulus?
Triggers a significant action potential due to a large generator potential.
What is the function of the skin receptors?
Detect various sensations like touch, pressure, and temperature.
What is the role of afferent pathways?
Carry sensory information from receptors to the CNS.
What is the function of the sensory input?
Provides information to the brain for processing and response.
What does the sensory cortex do?
Swaps information with nonprimary sensory cortex.
How does sensory information enter the CNS?
Through the brainstem or spinal cord, then travels to the thalamus.
What role does the thalamus play in sensory processing?
Shares information with the cerebral cortex and suppresses some sensations.
What happens to the cortical area after the loss of a hand?
Regions representing the upper arm and face expand, taking over the area of the missing hand.
What substances do injured cells release?
Substances that stimulate nerve endings and cause local inflammation.
What is released by pain fibers in the spinal cord?
Glutamate as a transmitter and substance P as a neuromodulator.
What is the spinothalamic tract?
A pathway that transmits pain and temperature sensations to the thalamus.
What is the role of nociceptors?
Detect harmful stimuli and signal pain.
What is the primary motor cortex responsible for?
Controls voluntary movements by sending signals to muscles.
What are neuromuscular junctions?
Sites where motor neurons communicate with muscle fibers.
What occurs at the dorsal root?
Sensory information enters the spinal cord through the dorsal root ganglion.
What is the function of inhibitory interneurons?
Inhibit motor neurons to regulate muscle contraction.
What happens to the cortical neurons after losing a hand?
Become innervated by neighboring cortical neurons.
What does the ventrolateral nucleus do?
Relays sensory information to the somatosensory cortex.
What is the role of mechanoreceptors?
Detect mechanical pressure or distortion.
What is the central sulcus?
The groove that separates the frontal and parietal lobes of the brain.
What does the premotor cortex do?
Plans and organizes movements before they are executed.
What is the auditory cortex responsible for?
Processes auditory information.
What is the gustatory cortex?
Processes taste information.
What happens when the gate theory of pain is applied?
Signals from mechanoreceptors can inhibit signals from nociceptors.
What is the function of the somatic sensory association area?
Integrates sensory information for perception.
What role does the insula play in the brain?
Involved in consciousness and emotion regulation.
What is the primary function of glutamate in pain signaling?
Acts as a neurotransmitter in pain pathways.
What are the main areas of the motor cortex?
What does the primary motor cortex control?
What is the function of the premotor cortex?
What is represented in the primary motor cortex?
What happens to the motor cortex after training?
What is the function of the cerebellum?
What are the components of the basal ganglia?
What does the feedback control system include?
What is the role of the brainstem in motor control?
What are the types of muscles controlled by the primary motor cortex?
What is the function of muscle spindles?
What is the function of Golgi tendon organs?
What is the corticospinal tract responsible for?
What does muscle contraction lead to in terms of receptor activity?
What does the lateral corticospinal tract control?
What is the role of the primary auditory cortex?
What does the visual unimodal association cortex do?
What is the function of the somatosensory cortex?
What does the nonprimary motor cortex do?
What are the functions of the nervous system?
What is the process of sensory transduction?
Conversion of environmental stimuli into electrical energy by receptor cells
What is a generator potential?
Local, graded depolarization in receptor cell triggered by a stimulus
What happens if the generator potential is strong enough?
Triggers action potential in receptor cell
What does the labeled line theory state?
Each neuron relays one specific type of information to a specific brain region
What is a caveat of the nervous system's processing?
Complex processing results in limited, filtered information reaching the cortex
What are the types of receptors in the skin?
What is adaptation in the context of neurons?
Progressive decrease in neuron’s response with continuous stimuli.
What are phasic receptors?
Receptors that show adaptation and signal the 'on' and 'off' of a stimulus.
What are tonic receptors?
Receptors with little or very slow adaptation, signaling stimulus duration.
What are the stages in the Dorsal Column Pathway?
What are the stages in the Spinothalamic Tract?
What is the Primary Somatosensory Cortex (S1)?
The first cortical region where touch information is received and processed.
How is the Primary Somatosensory Cortex organized?
Somatotopically organized, mapping the opposite side of the body.
What is a sensory homunculus?
A disproportionate map of body regions based on receptor cell density.
What is central modulation of sensory information?
Higher brain areas suppress some sensory input and amplify others.
What are reciprocal connections in sensory processing?
Connections between thalamus and cortex that allow modification of information relay.
What happens in nonprimary sensory cortical areas?
Different aspects of sensory experiences are processed.
What is the first step in sensory information processing?
Sensory information enters the CNS through the brainstem or spinal cord.
What are the reciprocal connections between thalamus and cortex?
Cortex modifies which information thalamus relays to it.
What is the role of nonprimary sensory cortical areas?
Process different aspects of sensory experience.
What is the effect of transplanted hand on S1?
S1 reorganizes in a few months for sensation perception.
How do professional musicians differ in S1 representation?
They have a larger S1 hand area than non-musicians.
What are the components of pain experience?
What is the corical pain network?
S1, S2, insula, anterior cingulate cortex (ACC), prefrontal cortex (PFC).
What is the role of neural circuits in pain?
They inhibit pain at multiple levels in the nervous system.
What can hypnotic suggestion do regarding pain?
Produce perception of pain without stimulating skin.
What is a common treatment using opiates?
Act on endogenous opioid receptors, especially in the midbrain periaqueductal gray.
What is the effect of acupuncture on pain?
Partially due to release of endogenous opioids (endorphins).
What is the role of the prefrontal cortex in behavior?
Analyzes sensory information and selects appropriate behavior.
What is required for complex behaviors?
Motor plans/motor programs in the motor areas of the cerebral cortex.
What is the flow of information in the cortex?
PFC → Limbic → Primary sensory areas → Sensory association areas → Multimodal association areas → Nonprimary motor cortex → Primary motor cortex → Muscles contract
What does the PMC control?
Groups of motor behaviors such as defensive movements and feeding behaviors
What does the Primary Motor Cortex (M1) do?
Relays instructions for voluntary movements to motor neurons in the spinal cord and brainstem
What are the symptoms of Parkinson’s disease?
What is a muscle spindle?
Embedded in muscle fibers; activated when muscle is stretched; informs brain about stretch amount.
What does the Golgi tendon organ do?
Embedded in tendons; informs brain of muscle tension; monitors force of contractions; warns of overload.
What happens during a weak stimulus?
Shows increasing response until threshold is reached, triggering an action potential.
What is the role of the thalamus?
Acts as a relay station for sensory information to the primary somatosensory cortex.
Where does sensory information enter the CNS?
Through the brainstem or spinal cord, then travels to the thalamus.
What is the primary somatosensory cortex?
Region of the brain that processes sensory input from the body.
What is the hierarchy of motor control?
Organizes the process of motor functions in the nervous system.
What is the role of cortical cells in response to stimuli?
Respond to stimulation with varying intensities and patterns.
What do sensory receptors do?
Detect environmental changes and transmit information to the nervous system.
What is the function of the peripheral nervous system (PNS)?
Connects the CNS to limbs and organs, transmitting sensory and motor signals.
What is the response to a moderate stimulus?
Increases generator potential, leading to action potential if threshold is reached.
What is the response to a strong stimulus?
Triggers a significant action potential due to a large generator potential.
What is the function of the skin receptors?
Detect various sensations like touch, pressure, and temperature.
What is the function of the sensory input?
Provides information to the brain for processing and response.
How does sensory information enter the CNS?
Through the brainstem or spinal cord, then travels to the thalamus.
What role does the thalamus play in sensory processing?
Shares information with the cerebral cortex and suppresses some sensations.
What happens to the cortical area after the loss of a hand?
Regions representing the upper arm and face expand, taking over the area of the missing hand.
What substances do injured cells release?
Substances that stimulate nerve endings and cause local inflammation.
What is released by pain fibers in the spinal cord?
Glutamate as a transmitter and substance P as a neuromodulator.
What is the spinothalamic tract?
A pathway that transmits pain and temperature sensations to the thalamus.
What is the primary motor cortex responsible for?
Controls voluntary movements by sending signals to muscles.
What occurs at the dorsal root?
Sensory information enters the spinal cord through the dorsal root ganglion.
What is the function of inhibitory interneurons?
Inhibit motor neurons to regulate muscle contraction.
What happens to the cortical neurons after losing a hand?
Become innervated by neighboring cortical neurons.
What happens when the gate theory of pain is applied?
Signals from mechanoreceptors can inhibit signals from nociceptors.
What is the function of the somatic sensory association area?
Integrates sensory information for perception.
What is the primary function of glutamate in pain signaling?
Acts as a neurotransmitter in pain pathways.
What are the main areas of the motor cortex?
What happens to the motor cortex after training?
What are the components of the basal ganglia?
What are the types of muscles controlled by the primary motor cortex?
What does muscle contraction lead to in terms of receptor activity?
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