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.
Ragtime was the first truly American musical genre, predating jazz. It began as dance music in the red-light districts of American cities such as St. Louis and New Orleans years before being published as popular sheet music for piano. It was a modification of the march made popular byâ¦.