Neurophysiology of Movement Disorders
Expert-defined terms from the Graduate Certificate in Clinical Neurophysiology Practice course at Stanmore School of Business. Free to read, free to share, paired with a globally recognised certification pathway.
Neurophysiology of Movement Disorders #
The Neurophysiology of Movement Disorders refers to the study of the elec… #
This field focuses on understanding how abnormal neuronal activity can lead to the development of movement disorders such as Parkinson's disease, dystonia, essential tremor, and others. By studying the neurophysiological mechanisms involved in these disorders, clinicians can better diagnose, monitor, and treat patients with movement disorders.
Basal Ganglia #
The Basal Ganglia are a group of nuclei located deep within the brain tha… #
They are involved in the initiation, execution, and modulation of voluntary movements. Dysfunction of the basal ganglia can lead to movement disorders such as Parkinson's disease and Huntington's disease. The basal ganglia receive input from various regions of the brain, including the cerebral cortex, and send output to the thalamus and brainstem to regulate motor activity.
Parkinson's Disease #
Parkinson's Disease is a neurodegenerative disorder characterized by the… #
The main symptoms of Parkinson's disease include tremors, bradykinesia (slowness of movement), rigidity, and postural instability. Neurophysiological studies in Parkinson's disease often reveal abnormal patterns of neuronal activity in the basal ganglia and other brain regions.
Dystonia #
Dystonia is a movement disorder characterized by sustained or repetitive… #
Dystonia can affect various parts of the body, such as the neck (cervical dystonia), face (oromandibular dystonia), or limbs (limb dystonia). Neurophysiological studies have shown that dystonia is associated with abnormal patterns of muscle activation and sensorimotor integration in the brain.
Essential Tremor #
Essential Tremor is a common movement disorder characterized by involunta… #
The tremor typically occurs during voluntary movements and can worsen with stress or fatigue. Neurophysiological studies have revealed abnormal oscillatory activity in the cerebellum and thalamus in patients with essential tremor, suggesting a dysfunction in the motor control pathways.
Cerebellum #
The Cerebellum is a region of the brain located behind the brainstem that… #
It receives input from the cerebral cortex and spinal cord and sends output to the motor cortex, brainstem, and spinal cord to regulate movement. Dysfunction of the cerebellum can lead to movement disorders such as ataxia and tremor.
Ataxia #
Ataxia is a neurological disorder characterized by a lack of coordination… #
It can affect various body parts, including the limbs, trunk, and eyes. Ataxia is often caused by damage to the cerebellum or its connections and can result from genetic mutations, stroke, or other neurological conditions.
Huntington's Disease #
Huntington's Disease is a genetic neurodegenerative disorder characterize… #
It is caused by a mutation in the huntingtin gene, leading to the degeneration of neurons in the basal ganglia and cerebral cortex. Neurophysiological studies in Huntington's disease have shown abnormal patterns of neuronal activity and neurotransmitter imbalances in the brain.
Tremor #
Tremor is an involuntary rhythmic shaking of a body part, most commonly t… #
Tremor can be caused by various factors, including essential tremor, Parkinson's disease, dystonia, or medication side effects. Neurophysiological studies can help differentiate between different types of tremor and guide treatment decisions.
Bradykinesia #
Bradykinesia is a slowness of movement that is a common symptom of Parkin… #
It can manifest as decreased arm swing while walking, difficulty initiating movements, or reduced facial expressions. Bradykinesia is often accompanied by rigidity and tremor and can significantly impact a person's ability to perform daily activities.
Rigidity #
Rigidity is an increased resistance to passive movement of the limbs or t… #
It is a common symptom of Parkinson's disease and results from increased muscle tone and abnormal muscle activation patterns. Neurophysiological studies can help assess the severity of rigidity and monitor changes in muscle tone over time.
Deep Brain Stimulation (DBS) #
Deep Brain Stimulation (DBS) is a surgical treatment for movement disorde… #
These electrodes deliver electrical impulses to modulate abnormal neuronal activity and alleviate symptoms such as tremor, bradykinesia, and rigidity. DBS has been shown to be effective in treating Parkinson's disease, essential tremor, and dystonia.
Electromyography (EMG) #
Electromyography (EMG) is a neurophysiological technique used to assess t… #
It involves placing small electrodes on the skin or into the muscle to record muscle activity at rest and during voluntary contractions. EMG can help diagnose neuromuscular disorders, evaluate muscle function, and guide treatment decisions in patients with movement disorders.
Motor Cortex #
The Motor Cortex is a region of the cerebral cortex responsible for plann… #
It receives input from the basal ganglia, cerebellum, and sensory areas of the brain and sends output to the spinal cord to control muscle contractions. Dysfunction of the motor cortex can lead to movement disorders such as stroke, motor neuron disease, or cerebral palsy.
Myoclonus #
Myoclonus is a sudden, brief, involuntary muscle twitch or jerk that can… #
It can be caused by various factors, including neurological conditions, medications, or metabolic disorders. Myoclonus can be classified based on its distribution, frequency, and triggers, and neurophysiological studies can help identify the underlying mechanisms of myoclonus.
Peripheral Nervous System #
The Peripheral Nervous System consists of nerves outside the brain and sp… #
It includes sensory nerves that transmit information from the body to the brain and motor nerves that control muscle movement. Dysfunction of the peripheral nervous system can lead to symptoms such as weakness, numbness, or pain in the limbs.
Sensory #
Motor Integration:
Sensory #
Motor Integration refers to the process by which sensory information is used to plan and execute motor actions. It involves the integration of sensory inputs from the environment, proprioceptive feedback from the body, and motor commands from the brain to generate coordinated movements. Dysfunction of sensory-motor integration can lead to movement disorders such as apraxia, dysmetria, or dystonia.
Apraxia #
Apraxia is a neurological disorder characterized by the inability to perf… #
It can affect various activities such as dressing, eating, or using tools. Apraxia is often caused by damage to the parietal or frontal lobes of the brain and can be associated with stroke, traumatic brain injury, or neurodegenerative diseases.
Dysmetria #
Dysmetria is a lack of coordination characterized by overshooting or unde… #
It is often seen in cerebellar disorders and can affect activities such as reaching for objects or walking. Dysmetria results from dysfunction in the cerebellum or its connections and can be assessed using clinical tests and neurophysiological studies.
Neurogenic Tremor #
Neurogenic Tremor is a type of tremor caused by dysfunction of the centra… #
It is typically characterized by a resting tremor that occurs when the affected body part is at rest. Neurophysiological studies can help differentiate neurogenic tremor from other types of tremor and guide treatment decisions.
Task #
Specific Dystonia:
Task #
Specific Dystonia is a focal dystonia that occurs during specific activities, such as writing (writer's cramp) or playing a musical instrument (musician's dystonia). It is thought to result from abnormal sensorimotor processing in the brain and can significantly impact a person's ability to perform skilled tasks. Neurophysiological studies can help identify the neural mechanisms underlying task-specific dystonia and guide treatment strategies.
Functional Movement Disorder #
Functional Movement Disorder is a condition characterized by abnormal mov… #
It is thought to result from psychological or emotional factors rather than structural brain abnormalities. Functional movement disorder can mimic neurological conditions such as tremor, dystonia, or myoclonus and can present diagnostic and treatment challenges for clinicians.
Gait Analysis #
Gait Analysis is a method used to assess the biomechanics of walking and… #
It involves recording and analyzing various parameters such as step length, stride width, and foot placement to evaluate gait abnormalities. Gait analysis can help diagnose movement disorders, monitor disease progression, and evaluate the effectiveness of treatment interventions in patients with neurological conditions.
Movement Disorder Society #
Unified Parkinson's Disease Rating Scale (MDS-UPDRS):
The Movement Disorder Society #
Unified Parkinson's Disease Rating Scale (MDS-UPDRS) is a tool used to assess the severity of Parkinson's disease symptoms and monitor disease progression. It consists of four parts that evaluate motor symptoms, non-motor symptoms, activities of daily living, and motor complications. The MDS-UPDRS is widely used in clinical practice and research to standardize the assessment of Parkinson's disease patients.
Neurophysiological Biomarkers #
Neurophysiological Biomarkers are objective measures of brain activity or… #
They include electroencephalography (EEG), electromyography (EMG), and evoked potentials, which provide information about neuronal excitability, connectivity, and integrity. Neurophysiological biomarkers can help guide treatment decisions and assess treatment response in patients with movement disorders.
Restless Legs Syndrome (RLS) #
Restless Legs Syndrome (RLS) is a neurological disorder characterized by… #
Symptoms typically worsen at rest and improve with movement. RLS can disrupt sleep and affect quality of life, and neurophysiological studies can help differentiate RLS from other movement disorders and guide treatment strategies.
Spasticity #
Spasticity is a motor disorder characterized by increased muscle tone, ex… #
It is often seen in conditions such as stroke, spinal cord injury, or multiple sclerosis. Spasticity can lead to muscle stiffness, pain, and functional impairment and can be assessed using clinical evaluations and neurophysiological studies.
Transcranial Magnetic Stimulation (TMS) #
Transcranial Magnetic Stimulation (TMS) is a non #
invasive neurophysiological technique used to stimulate specific regions of the brain by applying magnetic pulses to the scalp. TMS can modulate neuronal activity, assess corticospinal excitability, and map cortical motor areas in patients with movement disorders. It is used in research and clinical practice to study brain function and guide treatment decisions.
Wilson's Disease #
Wilson's Disease is a genetic disorder characterized by abnormal copper m… #
Neurological symptoms of Wilson's disease can include tremor, dystonia, dysarthria, and cognitive impairment. Neurophysiological studies can help assess the severity of neurological involvement and monitor treatment response in patients with Wilson's disease.