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 security co-ordinator and during one of his visits to Iraq, Stirrup met the new Basra security coordinator, General Mohan. Mohan wanted the British forces to withdraw from Basra and Stirrup stressed that once British forces had departed, Mohan's Iraqi forces would have to deal with security. Both Mohan and Stirrup were clear that retaining British forces outside Basra would be an insurance policy against a deteriorating situation within Basra as well as give Mohan something additional with which he could threaten the militias. Stirrup was concerned that a redeployment would look as though the British had been "bombed out of