Middle ear ◆ Tympanic cavity auditory ossicles a.v.n. mm. lg ◆ Auditory tube ◆ Mastoid antrum air cell
Middle ear Tympanic cavity Tympanic cavity auditory ossicles a.v.n.mm.lig. Auditory tube Mastoid antrum air cell air cell 11
Tympanic cavity It is irregular air-filled space between tympanic membrane the lateral wall of the inner ear. In which three are auditory ossicles, lig. muscle vessel nerve Six wall of tympanic cavity Internal 1 Roof -Tegmental wall carotid a 2 Floor -jugular wall 3 Ant -carotid wall 4 Post, -mastoid wall 6 5 Lat -membranous wall 6 Med -labyrinthine wall 3 2 Eardrum is removed Internal jugular v
Ty y mpanic cavity It is irregular air-filled space between tympanic membrane & the lateral wall of the inner ear.In which three are auditory the lateral wall of the inner ear.In which three are auditory ossicles ,lig.muscle vessel & nerve. 1 Six wall of tympanic cavity 1 Roof.－Tegmental wall Internal carotid a. 4 2 Floor.－jugular wall 3 Ant.－carotid wall 4 Post.－mastoid wall 6 5 Lat.－membranous wall 2 6 Med.－labyrinthine wall 3 12 2 Eardrum is removed Internal jugular v
Tympanic cavity and the clinic 1 Roof(tegmental wall) thin or defect- infection upward -otogenic meningitis 2 Floor(jugular wall) thin or defect-jugular bulb-bleeding while operation 3 Ant (carotid wall)sometimes artery bleeding while operation 4 Post. (mastoid wall Internal carotid a mastoiditis 5 Lat (membranous wall tympanic membrane 6 broken or performation 6 Med (labyrinthine wall 3 2 ternal jugular
Ty y mpanic cavity and the clinic 1 Roof.(tegmental wall) thin or defect- infection upward - otogenic meningitis 2 Floor(jugular wall) thin or defect-jugular bulb-bleeding while operation 3 Ant.(carotid wall)sometimes artery bleeding 1 Internal carotid a while operation 4 Post.(mastoid wall) 4 carotid a. mastoiditis 5 Lat.(membranous wall) 4 6 Lat.(membranous wall) tympanic membrane broken or performation 2 3 broken or performation 6 Med.(labyrinthine wall) 13 2 Internal jugular v
Epitympanic recess Lesser petrosal nerve Roof Prominence of lateral semicircular canal Malleus Incus Facial nerve Stapes Aditus to mastoid antrum Chorda tympani Prominence of canal for Tensor tympani Handle of malleus Tympanic plexus on promontory Latefal ternal of labyrinthine wall Tympanic membrane Stapedius Posterior Pyramidal eminence Floor Tympanic nerve(from CN IX) Anterior wall is cut A Anterior view Diagram of the tympanic cavity
Roof Lateral Internal Posterior Floor Di f th t i it Anterior wall is cut 14 Diagram of the tympanic cavity
The lateral wall of tympanic cavity Incus Entrance of mastoid antrum Mastoid antrum Tegmen tympanI Malleus Mastoid cells Stapes oe&e Tympani membrane Tensor tympani hi lie Mastoid cells Auditory tube Tube of Facial n internal jugular a Jugular fossa
The lateral wall of tympanic cavity 15