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 Staff in 2006: during his time in office the British Armed Forces faced significant commitments both to Iraq (Operation Telic) and Afghanistan (Operation Herrick). Stirrup retired as Chief of the Defence Staff on 29 October 2010, taking a seat in the House of Lords in 2011. Graham Eric Stirrup was born on 4 December 1949, the son of William Hamilton Stirrup and his wife, Jacqueline Brenda Stirrup ("née" Coulson). He was educated at Merchant Taylors' School in Northwood, Hertfordshire. Stirrup married Mary Alexandra Elliott in 1976 and they have one son. Stirrup includes golf, music, theatre and history among his