Saltation

(redirected from Saltations)
Also found in: Dictionary, Thesaurus, Medical.

saltation

[sȯl′tā·shən]
(geology)
Transport of a sediment in which the particles are moved forward in a series of short intermittent bounces from a bottom surface.

Saltation

 

the intermittent conduction of a nerve impulse along myelinated nerves, whose sheath has a relatively high resistance to electric currents. Regular (every 1–2 mm) microscopic constrictions in the myelin sheath, called the nodes of Ranvier, are found along the length of the nerve. Nerve-impulse conduction along internodal sections is achieved electro-tonically, although the weakening of an impulse is reduced by the insulating properties of myelin. Upon reaching the next node of Ranvier, a signal again increases in strength to the standard level as a result of the generation of an action potential. Thus, the reliable and economical conduction of an impulse along a nerve fiber is ensured: an impulse seems to jump from one node of Ranvier to another.