Node, sentinel lymph
The first lymph node to receive lymphatic drainage from a tumor. The sentinel node for a given tumor is found by injecting a tracer substance around the tumor. This substance then travels through the lymphatic system to the sentinel node. The tracer subst
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- Node, sinoatrial
The heart’s natural pacemaker, one of the major elements in the cardiac conduction system, the system that controls the heart rate. Abbreviated SA node. The SA node consists of a cluster of cells that are situated in the upper part of the wall of the heart’s right atrium, where the electrical impulses are generated. An […]
- Node, 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 the heart to contract and pump blood. The sinus node is the heart’s natural pacemaker. The sinus […]
- Nodes, Osler's
A diagnostic sign of bacterial infection of the heart (subacute bacterial endocarditis). These are small (the size of split peas), tender, transient nodules in the pads of fingers and toes and the palms and soles. Named for the Canadian-born physician Sir William Osler (1849-1919).
- Nodular hyperplasia of the prostate
Benign prostatic hyperplasia.
- Nodular melanoma
One of the four clinical types of malignant melanoma, which typically presents as a raised, distinct, bluish-black tumor that may be encircled by particularly pale skin, most often in middle-aged or older adults.