Evolution of the cochlea about 7 mm long. Like in lepidosaurs and archosaurs, it contains a lagena, a vestibular sensory epithelium, at its tip. Only in therian mammals (marsupials and placentals) is the cochlea truly coiled 1.5 to 3.5 times. Whereas in monotremes there are many rows of both inner and outer hair cells in the organ of Corti, in therian (marsupial and placental) mammals the number of inner hair-cell rows is one, and there are generally only three rows of outer hair cells. Amphibians have unique inner ear structures. There are two sensory papillae involved in hearing, the basilar (higher frequency) and amphibian
Jock Stirrup was one of 200 public figures who were signatories to a letter to "The Guardian" opposing Scottish independence in the run-up to September's referendum on that issue. In June 2015 Stirrup joined the House of Lords' EU External Affairs Sub-Committee. From October 2015 Stirrup has been the president of the Pilgrims Society. On Remembrance Sunday 2014, it was announced that Stirrup would lead the efforts to raise one million pounds to enable a national memorial to the British service personnel who fought in Iraq and Afghanistan to be erected in central London. By March 2015 Stirrup was confident that the