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Anatomy of Inner Ear

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  Anatomy  :  2 parts :             i ) Membranous                                                 ii) Bony      Membranous labyrinth is the actual inner ear . Bony labyrinth is the bony cover of membranous labyrinth .     Fluids of inner ear : Inner ear filled with endolymph and surrounded by perilymph .  Stria vascularis of Cochlea secretes Endolymph which is present in endolymphatic space .Perilymph = CSF   NOTE :Perilymph is connected to CSF through aqueduct of cochlea . That is why in a case of   meningitis deafness can occur . So BERA   should be done before discharge . Endolymph has high Potassium low sodium .   Perilymph has high Sodium and low potassium. (Tips : How to re...
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ENT NOTES : PINNA ANATOMY

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     PINNA        P)inna is made of yellow elastic cartilage which is again covered by skin .Skin is closely attached to cartilage on lateral surface but loose on medial ( back ) surface .  Nerve supply of pinna :    Lobule of pinna : Greater auricular nerve . Medial surface :  Lesser occipital nerve . Lateral surface : Auriculotemporal nerve . Concha of pinna : Auricular branch of vagus and few fibres of facial nerve .        Cauliflower are or boxer's ear : Post traumatic deformity = Subperichondrial hemorrhage  External Auditory Canal ::  24 mm in length . Outer 8mm cartilagenous , inner 16 mm bony . EAC is lined by skin . Outer part has hair follicles and ceruminous gland .  EAC skin migrated outwards and hence brings the dead skin and tissues out . If this migration is absent , it leads to accumulation of dead tissues and wax in EAC as a large expansile mass   ...
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Middle Ear Anatomy

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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 )                                   ...
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