phenotype affects entity abnormal impulse conducting system morphology abnormal Bachmann's bundle morphology MPheno.ontology csmith MP:0010517 abnormal anterior interatrial band morphology abnormal anterior internodal tract morphology According to Stedman's Medical Dictionary, the anatomic reality of this structure has been disputed. any structural anomaly of the impulse conduction tract that originates in the sinoatrial node and transmits signal to the left atrium 2010-10-01T10:36:16Z Bachmann's bundle Bachmann's bundle morphology phenotype