arc
(ahrk)
a part of the circumference of a circle, or a regularly curved line.
binauricular arc
the arc across the top of the head from one auricular point to the other.
reflex arc
the circuit traveled by impulses producing a reflex action: receptor organ, afferent nerve, nerve center, efferent nerve,
effector organ in a muscle; see also reflex.
Three-neuron reflex arc.

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