The Gross Anatomy of external and Middle ear Middle Ear
Download as PPTX, PDF
0 likes15 views
middle ear has 6 boundaries
The Gross Anatomy of external and Middle ear Middle Ear
- 1. Anatomy of Middle ear Dr. Suresh Managutti
- 2. Ear
- 3. Middle ear (Tympanic cavity) Location- petrous part of temporal bone Filled with air Lined by mucous membrane Full adult size at birth Communications- in front with lateral wall of nasopharynx auditory tube Behind with mastoid antrum through aditus to antrum
- 4. Pistol
- 5. Measurements Vertical diameter- 15 mm AP diameter- 15 mm TD- 6mm at roof, 2 mm middle, 4mm at floor
- 6. Subdivisions of middle ear Epitympanum (head of malleus, body & short process of incus) Mesotympanum (handle of malleus, long process of incus and stapes) Hypotympanum
- 8. Boundaries of tympanic cavity (cuboidal- 6 walls) Roof tegmen tympani , greater & lesser petrosal nerves Floor- jugular fossa IJV , tympanic branch of IX N Anterior wall- lower part- ICA & sympathetic plexus- carotico tympanic nerves; upper part- canal for tensor tympani & auditory tube Posterior wall- aditus to mastoid antrum, fossa incudis , vertical bony canal for facial nerve , pyramid- stapedius tendon Medial wall- promontory, fenestra vestibuli( oval window)- stapes, fenestra cochleae (round window) -scala tympani, sinus tympani- ampulla of P semicircular canal, oblique part of facial nerve canal, processus trochleariformis Lateral wall tympanic membrane umbo, pars tensa, pars flaccida anterior canaliculus for chorda tympani N
- 13. Lateral wall
- 18. Ear ossicles
- 20. Otoscopy
- 21. Syringing
- 23. Applied anatomy Otitis media- ASOM, CSOM- complications Otosclerosis Hyperacusis Tympanic membrane perforation Myringotomy, Myringoplasty, Tympanoplasty Facial nerve & chorda tympani injury Eustachian catarrh