<prompt> Stapedius muscle is supplied by:5th nerve6th nerve7th nerve8th nerve  <response>: 7th nerve: Ref: 225-LT 91-D 4thSTAPEDIUS MUSCLE - after emerging from the pyramid, is inserted into the neck of the stapes It has an action of damping the movement of the stapes by tilting outwards the anterior end of the foot plate. Supplied by facial nerveTENSOR TYMPANI MUSCLE - arise from the cartilaginous part of the auditory tube from the adjacent part of the greater wing of the sphenoid and from the bony canal Its action is to tense the tympanic membrane by drawing it medially Supplied by motor division of the trigeminal nerve, through the otic ganglion Tympanic plexus is formed by the ramification of the tympanic nerve Jacobsons nerve which is a branch of the glassoparyngeal nerve. 