Which is not a content of tympanic cavity :
Contents of middle ear or tympanic cavity are auditory ossicles (malleus, incus, and stapes), stapedius & tensor tympani muscles, chorda tympani nerve0 (a branch of 70 cranial nerve) and tympanic plexus of nerves.
Maleus
Chorda tympani
Stapedius
Post. auricular N