What is the relationship between the diameter of the nerve and the conduction velocity?
The conduction velocity is proportional to fiber diameter, and there is an optimum ratio of myelin thickness to fiber diameter for maximal conduction velocity. Internodal length is roughly proportional to fiber diameter in normal nerve populations (Hiscoe 1947; Vizoso and Young 1948; Vizoso 1950).
How does myelin thickness and axon diameter affect speed of impulse conduction?
Reduction in conduction velocity correlates more closely with reduction in axon diameter than fibre (axon + myelin) diameter. The ratio of the inner (axon) perimeter to the outer (myelin) perimeter remains constant at or near the optimal value of 0.6 for conduction in all groups of fibres at all periods of atrophy.
What affects conduction velocity of an action potential?
Axon diameter, internode distance, and myelin sheath thickness all influence the speed of action potential propagation.
What affects the speed of conduction conduction velocity down an axon?
Diameter of the axon – the larger the diameter of an axon increases the rate and speed of conductance as there is less leakage of ions. 3. Temperature – The higher the temperature the faster the conductance.
What is the effect of axon diameter on conduction velocity quizlet?
3. What is the effect of axon diameter on conduction velocity? The larger the axon diameter, the greater the conduction velocity.
What does nerve conduction velocity depend on?
Conduction velocity is dependent on internode distance, with a broad maximum centered around the value observed in normal peripheral fibers. Conduction velocity is also dependent on temperature and the properties of the axonal milieu.
Why is less current needed to stimulate a smaller diameter axon?
As the axon diameter is decreased, less current is necessary to stimulate it. (Why is this?) The current, then, may be reduced to minimize the current “shock artifact” during the stimulus by selecting IClamp in the Stimulus Control panel and reducing the amplitude of the current pulse from 20,000 nA to a lower value.
What does conduction velocity depend on?
What determines conduction velocity?
The conduction velocity of the action potential is determined by measuring the distance traveled (length of the nerve in m) and dividing by the time (sec) taken to complete the reflex arc, also called the latency. Conduction velocity = distance (m)/time (sec).
Which of the following factors is associated with increased conduction velocity in an axon?
The presence of the nodes of Ranvier speeds up the velocity of conduction along the axon.
How does axon diameter affect action potential?
In summary, increasing axon diameters accelerated action potential conduction along the axons. This finding is in line with cable theory (Goldstein and Rall, 1974) as axons of increased diameter have less internal electrical resistance, which facilitates the spread of action potential.
Which of the following will affect axonal conduction velocity?
Which of the following will aﬀect axonal conduction velocity? You correctly answered: both the diameter of the axon and the amount of myelination.