Dr.P.KARTHIKEYAN, D.L.O.,DNB(ENT),PROFESSOR AND HEAD OF ENT,

MGMCRI, PONDICHERRY.

MIDDLE EAR CLEFT

PARTS OF TYMPANIC MEMBRANE

CONTENTS OF MIDDLE EAR

SURGICAL IMPORTANCE

Layers of TM: outer epithelial layer middle fibrous layer inner mucosal layer Nerve supply: Branches of auriculotemporal nerve. Auricular branch of vagus. Tympanic branch of glossopharyngeal

nerve.

Irregular air filled space within temporal bone between TM laterally and osseous labyrinth medially.

Contains- 3 ossicles 2 muscles chorda tympani tympanic plexus

Anterio inferiorly – Ciliated columnar epithelium with lot of goblet cells and mucous glands.

Postero superiorly – Cuboidal epithelium with less glands.

Epitympanum – Pavement or flat epithelium.

DRAW THE DIAGRAM OF TM AND NAME ITS PARTS.

MEDIAL WALL OF MIDDLE EAR.

CONTENTS OF MIDDLE EAR

CSOM - SIGNIFICANCE