jaundice A yellowish staining of the integument, sclerae, deeper tissues, and excretions with bile pigments, resulting from increased levels in the plasma
jejunum The proximal (lateral) two fifths of the small intestine, about 8 feet in length, between the duodenum and the ileum. The jejunum is distinct from the ileum in being more proximal, of larger diameter with a thicker wall, having larger, more highly developed circular folds (plicae circulares), being more vascular (redder in appearance), with the jejunal arteries forming fewer tiers of arterial arcades and longer vasa recta.
jet lag An imbalance of the normal circadian rhythm resulting from subsonic or supersonic travel through a varied number of time zones and leading to fatigue, irritability, and various functional disturbances
joint anatomy the place of union, usually more or less movable, between two or more rigid skeletal components (bones, cartilage, or parts of a single bone). Joints between skeletal elements exhibit a great variety of form and function, and are classified into three general morphologic types: fibrous joints; cartilaginous joints; and synovial joints
joint capsule a sac enclosing the articulating ends of the bones participating in a synovial joint, formed by an outer fibrous layer and an inner synovial membrane
juvenile myoclonic epilepsy an epilepsy syndrome typically beginning in early adolescence, and characterized by early morning myoclonic jerks that may progress into a generalized tonic-clonic seizure. A genetic disorder: some families have had gene linkage to chromosome-6. The EEG is characterized by generalized polyspike and wave discharges at 4–6 Hz.
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