Anatomy Of Ear Flashcards
2 skeletal muscles attached to ossicles that help dampen loud sounds
Tensor tympani
Stapedius (decrease amplitude of oscillations into oval window)
Organ of corti loacted in membranous
Cochlear duct
Incisura terminalis
Area of no cartilage situated between tragus and crus of the helix.
Used for endaural approach in surgery of EAC or Mastoid
Cerumen/wax secreting glands in EAC
Ceruminous glands
Pilosebaceous glands
Structures confines to outer canal
Hair
Furuncles(staph infection of hair follicles) (in outer 1/3rd )
3 layers of tympanic membrane
Epithelial (outer)
Fibrous (middle)
Mucosal ( inner)
Middle air cleft constitutes
Eustachian tube
Aditus
Antrum
Mastoid air cells
Tympanic membrane is divided into 3 portions
Mesotympanum
Epitympanum / Attic
Hypotympanum
Protympanum
Portion of middle ear around tympanic orifice of eustachian tube.
Roof of middle ear
Tegmental wall (separates from middle cranial fossa)
Floor of the middle ear
Jugular wall (separates from internal jugular vien)
Lateral wall of middle ear
Membranous wall
Has
Tympanic membrane+ epitympanic recess(lateral bony wall)
Medial wall of middle ear
Labyrinthine wall
Contains
Oval window
Round window
Promontary
Posterior wall of middle ear
Mastoid wall
Contains
Pyramidal eminence
Aditus to mastoid antrum
Anterior wall of middle ear
Carotid wall (separates from carotid canal)
Contains
Canal of tensir tympani muscle
Opening of pharyngotympanic tube
