Branch Retinal Artery Occlusion - Pathophysiology. 1  Most commonly, a branch retinal artery occlusion occurs secondary to an embolus. Emboli typically originate within vessels upstream where they dislodge and travel within the circulatory system to ultimately become lodged downstream in a vessel with a smaller lumen.
Ragtime is a musical form or style that is defined as a syncopated melody (usually in 2/4 time) over a regular, march tempo bass line. Improvisation was common but little of that aspect has been preserved.
1 Folk Ragtime â A term for the ragtime music that came from small towns, and typically composed by musicians with no training. 2  Fox Trot â This most famous dance fad began in 1913, using ragtime's dotted-note rhythm. 3  Novelty Piano â A type of ragtime music played by white composers after World War I.