Modified radical Mastoidectomy

MRM is of 2 types : 1) E and E Or Canal Wall Up : a) Cortical mastoidectomy b) Posterior tympanotomy c) Combined approached Tympanoplasty 

 2) E, E , E or canal wall down :  Modified Radical Mastoidectomy b) Radical Mastoidectomy c) Atticotomy 

 mcq : First step of mastoidectomy ? Answer : Finding the mastoid antrum . The surface landmark of mastoid antrum : Mc. Evan's Triangle or Suprameatal triangle 
Q. What is Corner's septum ? Answer :It is petrosquamous suture , seen in some people , leads to difficulty in finding the antrum

Comments

Post a Comment

Popular posts from this blog

Middle Ear Anatomy

Image
Middle Ear Anatomy   :     # 3 parts : i) mesotympanum (6mm) ii) epitympanum ( a/k/a attic  2mm ) iii) hypotympanum (4mm)     # Bone which covers the attic is called Scutum .     # 6 walls of middle ear :                          i) Roof = Tegmen tympani , above the     roof lies the dura of temporal bone                          ii) Floor = below the floor lies Jugular bulb ( dilatation of lateral sinus )                          iii) Anterior wall = 2 opening : a)  for tensor tympani muscle ( supplied by mandibular division of Trigeminal Nerve )                                   ...
Read more

Audiology 

Image
 Hearing loss : 2 types : i) conductive hearing loss (pinna to footplate)                                          ii) sensory hearing loss    Conductive hearing loss causes :                                                      Wax                                                      CSOM                                                      Glue Ear                              ...
Read more

TYMPANIC MEMBRANE

Image
TYMPANIC MEMBRANE    # It is a pearly grey in colour # Oval 9-10 mm in diameter # surface area 90 sq mm # Outer part is more mobile than central part . # The effective surface area is 55 sq mm . # It is lying at an angle of 55 degree with horizontal  # Posterosuperior part is more lateral than anterolateral part . # Shows mobility on Seigelisation ( Putting air pressure on ear drum )  # Landmarks : 1 ) Handle of Malleus 2 ) Lateral process of malleus 3) Cone of light produced by refecltion of light from handle of malleus . Seen in  right ear at 5 o' clock position and Left ear at 7 o' clock position . 5 ) Umbo                                                 IT has 2 part 1) Pars Tensa : which again has 3 layers a) SKIN                             ...
Read more