Absent outer dynein arms Absent inner dynein arms Absent inner and outer dynein arms 2013-04-07T09:40:14Z UMLS:C4022986 HP:0012259 Complete absence of the dynein arms of respiratory motile cilia, that is, absence of the inner and the outer dynein arms, which normally are situated inside and outside of the peripheral microtubules of motile cilia. This feature is usually appreciated by electron microscopy.