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Large lower motor neurons of the brainstem and spinal cord
Alpha (α) motor neurons (also called alpha motoneurons), are large, multipolar lower motor neurons of the brainstem and spinal cord. They innervate extrafusal
Alpha_motor_neuron
Nerve cell sending impulse to muscle
effectors. Types of lower motor neurons are alpha motor neurons, beta motor neurons, and gamma motor neurons. A single motor neuron may innervate many muscle
Motor_neuron
Lower motor neuron involved in muscle contraction
A gamma motor neuron (γ motor neuron), also called gamma motoneuron, or fusimotor neuron, is a type of lower motor neuron that takes part in the process
Gamma_motor_neuron
Lower motor neuron involved in muscle contraction
motor neurons (β motor neurons), also called beta motoneurons, are a few kind of lower motor neuron, along with alpha motor neurons and gamma motor neurons
Beta_motor_neuron
Inhibitory interneurons found in the gray matter of the spinal cord
two ways with an alpha motor neuron. They receive an excitatory collateral from the alpha neuron's axon as they emerge from the motor root, and are thus
Renshaw_cell
Control effector organs, mainly muscles and glands
Lower motor neurons (LMNs) are motor neurons located in either the anterior grey column, anterior nerve roots (spinal lower motor neurons) or the cranial
Lower_motor_neuron
Three columns of grey matter within the spinal cord
cord. The anterior grey column is made up of alpha motor neurons, gamma motor neurons, and small neurons thought to be interneurons. It affects the skeletal
Grey_columns
Motor response evoked by electrical stimulation of a nerve
afferent and efferent loops of the alpha motor neuron in its entirety. As such, various properties of F-wave motor nerve conduction are analyzed in nerve
F_wave
Nerve exiting the central nervous system
subtype of motor neuron they are associate with. Alpha motor neurons target extrafusal muscle fibers. The motor nerves associated with these neurons innervate
Motor_nerve
Interneuron relaying signals between sensory and motor neurons in the spinal cord
(afferent) sensory neurons, and (efferent) motor neurons. Different classes of spinal interneurons are involved in the process of sensory-motor integration.
Spinal_interneuron
Group of motor neurons that innervate a muscle
Look up motor pool in Wiktionary, the free dictionary. A motor pool consists of all individual motor neurons that innervate a single muscle. Each individual
Motor_pool_(neuroscience)
Skeletal muscle fibers
gamma motor neurons and beta motor neurons that an individual is able to judge the position of their muscles. Alpha motor neuron Beta motor neuron Extrafusal
Intrafusal_muscle_fiber
Part of the brain's frontal cortex
cortical neurons, send long axons down the spinal cord to synapse onto the interneuron circuitry of the spinal cord and also directly onto the alpha motor neurons
Primary_motor_cortex
Axonal projections that exit a particular region
alpha motor neurons (α) – these target extrafusal muscle fibers, and gamma motor neurons (γ) that target intrafusal muscle fibers. Beta motor neurons
Efferent_nerve_fiber
Skeletal standard muscle fibers
fibers are the standard skeletal muscle fibers that are innervated by alpha motor neurons and generate tension by contracting, thereby allowing for skeletal
Extrafusal_muscle_fiber
Combination of a motor neuron and all muscle fibers it innervates
In biology, a motor unit is made up of a motor neuron and all of the skeletal muscle fibers innervated by the neuron's axon terminals, including the neuromuscular
Motor_unit
Protein in animal cells
Survival of motor neuron or survival motor neuron (SMN) is a protein that in humans is encoded by the SMN1 and SMN2 genes. SMN is found in the cytoplasm
Survival_of_motor_neuron
Innervated muscle structure involved in reflex actions and proprioception
monosynaptically to many alpha motor neurons of the receptor-bearing muscle. The reflexly evoked activity in the alpha motor neurons is then transmitted via
Muscle_spindle
Nerve fiber
carrying motor impulses to skeletal muscle through a neuromuscular junction. Of the somatic efferent neurons, there exist subtypes. Alpha motor neurons (α)
General somatic efferent fiber
General_somatic_efferent_fiber
Long projection on a neuron that conducts signals to other neurons
neurons of the different motor fibers, were the lower motor neurons – alpha motor neuron, beta motor neuron, and gamma motor neuron having the Aα, Aβ, and
Axon
Primary cell of the nervous system
human inhibitory neurons that interconnect with Pyramidal cells Renshaw cells, neurons with both ends linked to alpha motor neurons Unipolar brush cells
Neuron
Muscle contraction in response to stretching
This increases alpha motor neuron activity, causing the muscle fibers to contract and thus resist the stretching. A secondary set of neurons also causes
Stretch_reflex
Operation of opposing sets of muscles
spindle bifurcates in the spinal cord. One branch innervates the alpha motor neuron that causes the homonymous muscle to contract, producing the reflex
Reciprocal_inhibition
Reduction or absence of bodily reflexes
motor neurons (at the alpha motor neurons from the spinal cord to a muscle), whereas hyperreflexia is often attributed to lesions in the upper motor neurons
Hyporeflexia
Protein found in humans
related synucleinopathies, abnormal, insoluble forms of alpha-synuclein accumulate within neurons as inclusions known as Lewy bodies. Mutations in the SNCA
Alpha-synuclein
Connection formed between neurons that allows neurotransmission
primarily on its origin (in the primary motor cortex, Brodmann area 4) and termination (onto the alpha motor neurons of the spinal cord).[citation needed]
Neural_pathway
Part of the peripheral nervous system
gyrus are transmitted from upper motor neurons, down the corticospinal tract, to lower motor neurons (alpha motor neurons) in the brainstem and ventral horn
Somatic_nervous_system
Chronic neurological sleep disorder
and animal models. During normal REM sleep, spinal and brainstem alpha motor neuron hyperpolarization produces almost complete atonia of skeletal muscles
Narcolepsy
Monosynaptic reflex
spinal cord, completely independent of higher centres. From there, an alpha motor neuron conducts an efferent impulse back to the quadriceps femoris muscle
Patellar_reflex
American electric vehicle company
Alpha Motor Corporation (commonly known as Alpha) is an American electric vehicle company based in Irvine, California. As of 2024, the company has revealed
Alpha_Motor_Corporation
Additional activation of motor units to increase contractile strength
one motor neuron and all of the muscle fibers it stimulates. All muscles consist of a number of motor units and the fibers belonging to a motor unit
Motor_unit_recruitment
Brainwaves, repetitive patterns of neural activity in the central nervous system
perception, motor control and memory. The opposite of neuron synchronization is neural isolation, which is when electrical activity of neurons is not temporally
Neural_oscillation
Regulation of movement within organisms possessing a nervous system
right force at the right time. A single motor neuron and the muscle fibers it innervates are called a motor unit. For example, the rectus femoris contains
Motor_control
Group of neurons
as alpha motor neurons. A study by Bergmann et al. showed that Onuf nucleus cells have the same cytoskeletal abnormalities as alpha motor neurons in motor
Onuf's_nucleus
Abnormal stiffness of skeletal muscle
spindle afferent nerve fibres, resulting in excessive activation of alpha motor neurons of the spinal cord. It is similar to the tug we feel initially while
Spasticity
Type of painful muscle spasm
control; this includes increased alpha-motor neuron activity in the spinal cord, which overloads the lower motor neurons, and increased muscle cell membrane
Exercise-associated muscle cramps
Exercise-associated_muscle_cramps
Neural oscillations in the frequency range of 8–12 Hz
al. suggested cortical- a lamina- and principal neuron subtype specific origin for the visual alpha rhythm. On the basis of examination of patients with
Alpha_wave
Extremely potent neurotoxin
neurotransmitters inhibit the alpha motor neurons. With diminished inhibition, the resting firing rate of the alpha motor neuron increases, producing rigidity
Tetanus_toxin
Pyramidal white matter motor pathway
corticospinal tract is a white matter motor pathway starting at the cerebral cortex that terminates on lower motor neurons and interneurons in the spinal cord
Corticospinal_tract
Physiological reflex
they synapse with interneurons, which, in turn, excite or inhibit alpha motor neurons to the muscles of the contralateral limb. In the ipsilateral leg
Crossed_extensor_reflex
Neuroscientific theory
and motor representations of an action are so strong that the motor neurons start firing to the sound or the vision of the action, and a mirror neuron is
Hebbian_theory
synapse on the interneuron, they can either inhibit or excite an alpha motor neuron on the muscles on side contralateral to the stimulus.[citation needed]
Escape_reflex
Sensory receptor cell responding to mechanical pressure or strain
needed] Some of the branches of the I-a axons synapse directly with alpha motor neurons. These carry impulses back to the same muscle causing it to contract
Mechanoreceptor
Topics referred to by the same term
the free dictionary. Amn or AMN may refer to: Alpha motor neuron (α-MNs), large lower motor neurons of the brainstem and spinal cord Amnionless, a gene
AMN
Voltages associated with muscle fibre
The neuromuscular junction is the synapse that is formed between an alpha motor neuron (α-MN) and the skeletal muscle fiber. In order for a muscle to contract
End-plate_potential
motor unit consists of one alpha motor neuron and all the muscle fibres it innervates. Muscles differ in the number of motor units that they contain, and
Motor_unit_number_estimation
Progressive neurodegenerative disease
dopamine-producing neurons in a brain region called the substantia nigra and other related cell groups in the brainstem. Misfolded proteins, such as alpha-synuclein
Parkinson's_disease
Field of study
and spinal muscular atrophy (SMA). See the Motor Neuron Fact Sheet for details regarding other motor neuron diseases. Neurodegenerative diseases of the
Epigenetics of neurodegenerative diseases
Epigenetics_of_neurodegenerative_diseases
Models used in Parkinson's disease research
of dopaminergic neurons in the substantia nigra pars compacta (SNpc). The loss of the dopamine neurons in the brain, results in motor dysfunction, ultimately
Animal models of Parkinson's disease
Animal_models_of_Parkinson's_disease
Spherical inclusion commonly found in damaged neurons
non-homologous end joining The repair function of alpha-synuclein appears to be greatly reduced in Lewy body-bearing neurons, and this reduction may trigger cell death
Lewy_body
Protein-coding gene in humans
Survival of motor neuron 1 (SMN1), also known as component of gems 1 or GEMIN1, is a gene that encodes the SMN protein in humans.The chemical formula
SMN1
Central nervous system disease
Parkinson's disease-associated mutant alpha-synucleins through axons of cultured neurons. Membrane damage by alpha-synuclein could be another Parkinson's
Neurodegenerative_disease
Neural tract in the central nervous system
Like other descending motor pathways, the vestibulospinal fibers of the tract relay information from nuclei to motor neurons. The vestibular nuclei receive
Vestibulospinal_tract
motor unit consists of a voluntary alpha motoneuron and all of the collective muscle fibers that it controls, known as the effector muscle. The alpha
Motor_unit_plasticity
Electrical activity in the part of the brain controlling voluntary movement
large numbers of neurons firing in synchrony. The mu rhythm is even suppressed when one observes another person performing a motor action or an abstract
Mu_wave
neurons. Upper motor neuron A neuron originating in the cerebral cortex or brainstem that transmits motor signals to lower motor neurons. Damage leads to
Glossary_of_neuroscience
Form of neuraxial regional anaesthesia
associated with pain are blocked first, while thick, heavily myelinated A-alpha motor neurons are blocked moderately. Heavily myelinated, small preganglionic sympathetic
Spinal_anaesthesia
Organ central to the nervous system
absence of lateral motor column neurons in snakes, which innervate limb muscles controlling limb movements; absence of motor neurons that innervate trunk
Brain
Cluster of interneurons in the medulla oblongata
core network generating inspiratory rhythm as well as premotor and motor neurons that define a minimal breathing-related circuit suitable for studies
Pre-Bötzinger_complex
Innate escape mechanism by crustaceans
fan. Each ganglion contains the body of one motor giant neuron (MoG), powerful and large bodied motor neurons whose projections innervate the five fast
Caridoid_escape_reaction
Type of synapse
excitatory synapse is a synapse in which an action potential in a presynaptic neuron depolarizes the membrane of the postsynaptic cell, and thus increases the
Excitatory_synapse
Burn caused by microwave radiation
resulting sensitivity persists for a long time. Degeneration of the alpha motor neurons is also caused by the exposure to heat and radiation. Most of the
Microwave_burn
Muscular function
Upper motor neuron lesions which damage the descending pathways down to the spinal cord may cause increase in muscle tone, partly because alpha motoneurons
Golgi_tendon_reflex
Class of drugs
Romifidine Synephrine Talipexole Alpha-adrenergic agonists, more specifically the auto receptors of alpha 2 neurons, are used in the treatment of glaucoma
Alpha-adrenergic_agonist
Chemical compound
pyrethroid insecticides leading to a syndrome clinically similar to motor neuron disease. There are no antidotes, and treatment must be symptomatic, as
Deltamethrin
Structure in the basal ganglia of the brain
causes the thalamocortical pathways to become excited and transmits motor neuron signals to the cerebral cortex to allow the initiation of movement, which
Substantia_nigra
Part of the human brain
altered by chemical manipulation of a cortical motor area". Neuron. 43 (4): 585–593. doi:10.1016/j.neuron.2004.07.029. PMID 15312656.{{cite journal}}: CS1
Premotor_cortex
Electrophysiological method to record electrical activity of the brain
reflects the synchronous firing of motor neurons in rest state. Mu suppression is thought to reflect motor mirror neuron systems, because when an action
Electroencephalography
Antihypertensive drug
terazosin may have the potential to confer neuroprotection upon motor neurons in motor neuron disease, as a result of its ability to activate PGK1. "Terazosin
Terazosin
Sense of self-movement, force, and body position
chordotonal neurons), which activates a motor neuron to induce muscle contraction and oppose the stretch. During locomotion, sensory neurons can reverse
Proprioception
Family of transport proteins
Human Cerebral Cortical Folding and Oral Motor Development". Neuron. 99 (5): 905–913.e7. doi:10.1016/j.neuron.2018.07.052. PMC 6226006. PMID 30146301.
Voltage-gated_sodium_channel
Changes in men and women as they get older
and strength. These decreases may be partially due to losses of alpha motor neurons. By the age of 70, these losses occur in both proximal and distal
Aging_movement_control
G protein-coupled receptor
Involved in the detection of mechanical feedback on the hypoglossal motor neurons which allow a long-term facilitation in respiration in response to repeated
Alpha-1_adrenergic_receptor
Enzyme in mammals and humans
This isoenzyme, a homodimer, is found in mature neurons and cells of neuronal origin. A switch from alpha enolase to gamma enolase occurs in neural tissue
Enolase_2
Gastrointestinal dysfunction and Parkinson's disease
of dopaminergic neurons in the substantia nigra pars compacta region of the brain (shown in figure) and the presence of aggregated alpha-synuclein. Under
Parkinson's disease and gut-brain axis
Parkinson's_disease_and_gut-brain_axis
Class of G protein-coupled receptors
Fargeas MJ, Bueno L (1987). "Involvement of alpha-1 and alpha-2 adrenoceptors in the postlaparotomy intestinal motor disturbances in the rat". Gut. 28 (8):
Adrenergic_receptor
adrenergic afferent neuron agger nasi agnosia agonist alar ligament albuginea alimentary allantois allocortex alpha motor neurons alveolar artery alveolar
Index_of_anatomy_articles
Topics referred to by the same term
disorder Methylmalonic acid Middle meningeal artery Monomelic amyotrophy, a motor neuron disease Metropolitan Manila Authority, predecessor of the Metropolitan
MMA_(disambiguation)
Toxin harmful to nervous tissue
postsynaptic neuron. The effect of this increased signaling threshold is a reduced excitability of postsynaptic neurons, and subsequent loss of motor and sensory
Neurotoxin
Medical condition
misfolded proteins such as alpha-synuclein. Alpha-synuclein is normally found in the presynaptic terminals of neurons. If alpha-synuclein is mis-folded and
Pathophysiology of Parkinson's disease
Pathophysiology_of_Parkinson's_disease
the synapse. Since the neurons of the ELL receive both a corollary discharge (another term for an efference copy) of the motor output commands sent to
Anti-Hebbian_learning
Psychometric instrument for visual imagery vividness
during visual and motor imagery in vivid and non-vivid imagers. Topographical maps of EEG activation revealed attenuation of alpha power in vivid images
Vividness of Visual Imagery Questionnaire
Vividness_of_Visual_Imagery_Questionnaire
Family of biomolecules
neurotrophic factor affects embryonic motor neurons, dorsal root ganglion sensory neurons, and ciliary neuron hippocampal neurons. It is structurally related to
Neurotrophic_factors
Diagnostic framework in personalized psychiatry
Judgement Execution n/a n/a Alpha motor neurons Betz cells Pyramidal cells Efferent and afferent spinal and peripheral pathways Motor cortex Bereitschaftspotential
Research_Domain_Criteria
Connection between brain and computer
multiple neurons in the primary motor cortex if they were rewarded accordingly. Algorithms to reconstruct movements from motor cortex neurons, which control
Brain–computer_interface
Formation of neuronal junctions in the nervous system
on this involved motor neurons of C.elegans. In this study, researchers found that knockout animals without the gene, unc-4 have motor defects specifically
Synaptogenesis
Form of epilepsy that may be related to a psychiatric problem or a sleep disorder
Primary motor cortex Contains large neurons that project axons down to the spinal cord where they synapse onto alpha motor neurons. These neurons are involved
Frontal_lobe_epilepsy
Ermentrout–Kopell canonical model, is a biological neuron model originally developed to mathematically describe neurons in the animal Aplysia. The model is particularly
Theta_model
Damage to nervous tissue
(1999). "Regulation of ciliary neurotrophic factor receptor alpha in sciatic motor neurons following axotomy". Neuroscience. 91 (4): 1401–13. doi:10
Nerve_injury
Part of the autonomic nervous system that stimulates fight-or-flight responses
occurs due to the activation of alpha-1 adrenergic receptors by norepinephrine released by post-ganglionic sympathetic neurons. These receptors exist throughout
Sympathetic_nervous_system
Phenomenon of neural activity
Stuart (2004). "Synchronized Oscillations at Alpha and Theta Frequencies in the Lateral Geniculate Nucleus". Neuron. 42 (2): 253–268. doi:10.1016/s0896-6273(04)00191-6
Recurrent thalamo-cortical resonance
Recurrent_thalamo-cortical_resonance
of inhibitory synaptic currents in cerebellar granule neurons: role of GABA(A) receptor alpha 6 subunit". The Journal of Neuroscience. 16 (11): 3630–3640
Golgi_cell
Activity fraction of a periodic system
action potentials by a living system such as a neuron. Some publications use α {\displaystyle \alpha } as the symbol for duty cycle. As a ratio, duty
Duty_cycle
American neurophysiologist (1915–1996)
American neurophysiologist who studied the properties of vertebrate motor neurons. Henneman received his bachelor's degree from Harvard College in Cambridge
Elwood_Henneman
Medical condition
characterised by the abnormal accumulation of aggregates of alpha-synuclein protein in neurons, nerve fibres or glial cells. The synucleinopathies include
Synucleinopathy
Chemical compound
grass pea Lathyrus sativus. It is the neurotoxin responsible for the motor neuron degeneration syndrome lathyrism. ODAP is found in the seeds of the legume
Oxalyldiaminopropionic_acid
Benzodiazepine
that haloxazolam only affects gamma motor neurons, whereas estazolam affects both alpha and gamma motor neurons. Benzodiazepine Anvisa (2023-03-31).
Haloxazolam
Topics referred to by the same term
defunct electric car company alpha-Pyrrolidinobutiophenone (α-PBP), a stimulant Progressive bulbar palsy, a motor neuron disease Picture by picture, two
PBP
Protein-coding gene in humans
Survival of motor neuron 2 (SMN2) is a gene that encodes the SMN protein (full and truncated) in humans. The SMN2 gene is part of a 500 kb inverted duplication
SMN2
Organic chemical that functions both as a hormone and a neurotransmitter
release or block its reuptake into neurons following release. Other brain dopamine pathways are involved in motor control and in controlling the release
Dopamine
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