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 Armed Forces, Stirrup viewed the solution as being essentially political. In order to take action against the militias, the local British commander in South East Iraq developed a plan to conduct aggressive operations against them. At the same time Stirrup became increasingly concerned that strong political leadership from the Iraqis was lacking and that without this any gains made by the military actions against the militias would be to no avail. In July 2006, Stirrup overturned the previous military advice to the Defence Secretary by stating that force levels in South East Iraq would need to be maintained. Previously it