Question: In the human ear: 
 Options:  <1> The stereocilia of the sensory cells are bathed in perilymph. <2> The abutment fits over the round window. <3> The sensory cells are on the Reissner membrane. <4> The synaptan receptor cells with fibers from the eighth cranial nerve. <5> The helicotrema communicates the middle and tympanic ramps.
4