Emboli origination 90-95% of pulmonary emboli originate in the deep venous system of the lower extremities other rare locations include Uterine and prostatic veins Upper extremities Renal veins Right side of the heart MBBS project, Zhongshan HospitalMBBS project, Zhongshan Hospital Emboli origination • 90-95% of pulmonary emboli originate in the deep venous system of the lower extremities • Other rare locations include — Uterine and prostatic veins — Upper extremities — Renal veins — Right side of the heart