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 Secretary Liam Fox announced that General Sir David Richards, the then Chief of the General Staff, would succeed Stirrup as Chief of the Defence Staff in October 2010. Richards took over on 29 October 2010 and Stirrup was created a life peer as Baron Stirrup, of Marylebone in the City of Westminster. He was introduced into the House of Lords on 1 February 2011, where he sits as a crossbencher. Stirrup officially retired from the RAF on 4 April 2011. The following month Stirrup gave detailed evidence to the Commons Defence Select Committee on the UK's recent Strategic Defence and