Define Motorneuron. Motorneuron synonyms, Motorneuron pronunciation, Motorneuron translation, English dictionary definition of Motorneuron. n. A neuron that conveys impulses from the central nervous system to a muscle, gland, or other effector tissue. Am
1.anatomy, physiologyDenoting those neural structures that, by the impulses generated and transmitted by them, cause muscle fibers or pigment cells to contract, or glands to secrete. See also:motor cortex,motor endplate,motor neuron 2.psychologyDenoting the overt reaction of an organism to a stim...
nounInanatomy, specifically, a motor nerve. nounAn alternating-current motor in which the wattless current is compensated by a condenser or by auxiliary commutator-brushes; a compensated repulsion-motor. nounOne who or that which imparts motion; a source or originator of mechanical power; a movi...
radicle - (anatomy) a small structure resembling a rootlet (such as a fibril of a nerve) nerve fiber, nerve fibre - a threadlike extension of a nerve cell synapse - the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle; "nerve impulses cross a synapse th...
or lowermotor neuron, may be located either in the anterior horn of the spinal cord or in the gray matter of thebrainstem. As the motor axon (first as root, then plexus, and then peripheral nerve) approaches its family of muscle fibers, it branches into many nerve terminals; each of the...
MOTOR NEURONES Recruitment Anterior horn cells (alpha, beta and gamma motor neurones) comprise Sherrington's ‘final common pathway’ of movement. Using the technique ofmicroneurography, Vallbo61established thatalpha motor neuronesbecome active before fusimotor fibres increase the afferent discharge from...
Upper Motor Neuron Syndrome The symptoms of UMN syndrome can separate into negative and positive symptoms. Negative symptoms include weakness, decreased motor control, and easy fatigability. A unique characteristic of UMN syndrome is its tendency to affect specific muscle groups. The weakness caused...
CLINICAL ANATOMY, PHYSIOLOGY, AND PATHOLOGY OF MOTOR NEURON DISEASEBromberg, M.B.CONTEMPORARY NEUROLOGY SERIES
Counterintuitively, we find that activity in a single motor neuron rotates the head in different directions, depending on the starting posture of the head, such that the head converges towards a pose determined by the identity of the stimulated motor neuron. A feedback model predicts that this ...
CLINICAL SIGNS OF UPPER MOTOR NEURON DISEASE Paresis Disorders that interfere with the ability of the UMN to initiate gait generation result in paresis. Paresis by definition is weakness, but the quality of this UMN paresis differs significantly from the quality of LMN paresis. Incomplete LMN ...