node
61node of Ran|vier — «rahn VYAY», the site of a local constriction in the myelin and axon of a myelinated nerve cell: »The ion movements can occur only in the gaps in the myelin sheath…called the nodes of Ranvier, and the nerve impulse has to jump from one node to… …
62node of Ranvier — node of Ran·vier rän vē .ā n a small gap in the myelin sheath of a myelinated nerve fiber Ran·vier rȧn vyā Louis Antoine (1835 1922) French histologist. Ranvier was one of the foremost histologists of his time. He is credited with transforming… …
63node of Ranvier — node′ of Ran•vier′ [[t]rɑnˈvyeɪ, ˈrɑn vyeɪ[/t]] n. cbl a gap occurring at regular intervals between segments of myelin sheath along a nerve axon • Etymology: after Louis Antoine Ranvier (1835–1922), French histologist …
64node of Ranvier — [rän vyā′] n. pl. nodes of Ranvier [after L. A. Ranvier (1835 1922), Fr histologist] any of the constrictions along the myelin sheath that surrounds an axon of a nerve cell: nodes are formed where two Schwann cells meet and are essential to the… …
65Node (networking) — For other uses, see Node (disambiguation). In communication networks, a node (Latin nodus, ‘knot’) is a connection point, either a redistribution point or a communication endpoint (some terminal equipment). The definition of a node depends on the …
66Node (computer science) — A node is a record consisting of one or more fields that are links to other nodes, and a data field. The link and data fields are often implemented by pointers or references although it is also quite common for the data to be embedded directly in …
67Node, atrioventricular — The atrioventricular (AV) node is an electrical relay station between the atria (the upper) and the ventricles (the lower chambers of the heart). Electrical signals from the atria must pass through the AV node to reach the ventricles. The AV node …
68Node (physics) — A standing wave. The red dots are the wave nodes A node is a point along a standing wave where the wave has minimal amplitude. For instance, in a vibrating guitar string, the ends of the string are nodes. By changing the position of the end node… …
69Node, sinus — The sinus node is one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating …
70Node, sinoatrial — The sinoatrial is one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating …
