Evolution of the cochlea of the ear, consisting of the scala media, the scala tympani, and the scala vestibuli. Regarding mammals, placental and marsupial cochleae have similar cochlear responses to auditory stimulation as well as DC resting potentials. This leads to the investigation of the relationship between these therian mammals and researching their ancestral species to trace the origin of the cochlea. This spiral-shaped cochlea that is in both marsupial and placental mammals is traced back to approximately 120 million years ago. The development of the most basic basilar papilla (the auditory organ that later evolved into the Organ of Corti in mammals) happened
Jock Stirrup Unit which was based at RAF Lossiemouth in March 1983: his duties centred around the instruction of trainee pilots on the SEPECAT Jaguar and, on 7 March 1983, Stirrup was carrying out a student progress check from the rear seat of his aircraft when they suffered a serious bird strike. Stirrup was unable to ascertain whether his student was conscious and forward vision through the canopy was obscured: one of his engines caught fire, and although ejecting from the aircraft would have been justified, not knowing whether the student was conscious or not, Stirrup managed to land at RAF Leuchars.