Motor Conduction
Motor Conduction - Related Videos
09:29
DC Motors
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. The DC machine operates with DC currents and voltages as opposed to an AC machine, which requires AC currents and voltages. DC machines were the first to be invented and utilize two magnetic fields that are controlled by DC currents. The same machine can be easily reconfigured to be a motor or generator if appropriate field excitation is available, since the DC machine has two fields termed field...
11:03
Motor Maps
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California One principle of brain organization is the topographic mapping of information. Especially in sensory and motor cortices, adjacent regions of the brain tend to represent information from adjacent parts of the body, resulting in maps of the body expressed on the surface of the brain. The primary sensory and motor maps in the brain surround a prominent sulcus known as the central sulcus. The cortex...
14:05
Motor Exam II
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2023
Source:Tracey A. Milligan, MD; Tamara B. Kaplan, MD; Neurology, Brigham and Women's/Massachusetts General Hospital, Boston, Massachusetts, USA There are two main types of reflexes that are tested on a neurological examination: stretch (or deep tendon reflexes) and superficial reflexes. A deep tendon reflex (DTR) results from the stimulation of a stretch-sensitive afferent from a neuromuscular spindle, which, via a single synapse, stimulates a motor nerve leading to a muscle contraction. DTRs...
09:09
Conducting Reactions Below Room Temperature
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2023
Source: Laboratory of Dr. Dana Lashley - College of William and Mary Demonstration by: Matt Smith When new bonds are formed in the course of a chemical reaction, it requires that the involved species (atoms or molecules) come in very close proximity and collide into one another. The collisions between these species are more frequent and effective the higher the speed at which these molecules are moving. A widely used rule of thumb, which has its roots in the Arrhenius equation1, states that...
08:45
An Introduction to Motor Control
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2023
Motor control involves integration and processing of sensory information by our nervous system, followed by a response through our skeletal system to perform a voluntary or involuntary action. It is vital to understand how our neuroskeletal system controls motor behavior in order to evaluate injuries pertaining to general movement, reflexes, and coordination. An improved understanding of motor control will help behavioral neuroscientists in developing useful tools to treat motor disorders, such...
FAQs
Sequential activation of voltage-gated ion channels produces depolarization in neighboring regions of the axon. Each active segment helps bring the next segment to the electrical state needed to continue the action potential. This organized progression preserves signal transmission over the motor neuron and allows the impulse to reach the nerve ending that communicates with skeletal muscle.
Myelin supports faster transmission by allowing the action potential to move between separated nodes of Ranvier rather than progressing continuously along every part of the axon. This pattern, called saltatory conduction, makes signal propagation more efficient. Consequently, the condition of myelinated axons is an important factor when interpreting how rapidly motor impulses travel.
When the electrical impulse reaches the neuromuscular junction, it triggers release of acetylcholine. This chemical signal connects electrical activity in the motor nerve with activation of skeletal muscle. The junction therefore serves as the communication point where motor conduction produces its functional effect, linking axonal signaling to muscle activation rather than merely carrying an impulse along the nerve.
Nerve conduction studies evaluate motor pathways by measuring response latency, response amplitude, and conduction velocity. Latency reflects the timing of the recorded response, amplitude indicates its size, and velocity describes how quickly the impulse travels. Considering these measurements together gives clinical neurophysiology a structured way to assess peripheral motor nerve function.
Abnormalities in latency, amplitude, or conduction velocity can indicate that motor nerve function is impaired. Comparing these response characteristics helps clinicians identify peripheral nerve dysfunction and localize lesions within the motor pathway. The value lies not only in detecting an abnormal result, but also in using the measured pattern to connect the disturbance with a peripheral nerve site.
Repeated nerve conduction studies can track changes in peripheral motor nerve function over time. Measurements of latency, amplitude, and conduction velocity provide comparable indicators for assessing whether dysfunction persists, changes, or improves. In neuroscience and clinical neurophysiology, this makes Motor Conduction useful for monitoring disease progression as well as recovery after an identified nerve problem.