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Vestibulocochlear Organ ---- 前庭蜗器. The Vestibulocochlear Organ 前庭蜗器 Parts: external ear 外耳 middle ear 中耳 internal ear 内耳: Conduct the sound wave 。 Contains

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Text of Vestibulocochlear Organ ---- 前庭蜗器. The Vestibulocochlear Organ 前庭蜗器 Parts: external...

  • Vestibulocochlear Organ ----

  • The Vestibulocochlear Organ

    Parts: external ear middle ear internal ear Conduct the sound waveContains the receptors of auditory and vestibular organs

  • External earThe external ear consists of auricle,external acoustic meatus tympanic membrane .

  • External ear1. Auricle Helix Antihelix crura of antihelix triangular fossa Scapha auricular concha externalacoustic pore Tragus Antitragus auricular lobule

  • 2. external acoustic meatus : bony part medial 2/3cartilaginous part lateral 1/3 External ear

  • External ear3. tympanic membrane : Flaccid part : upper 1/4 Tense part : lower 3/4

    Umbo of tympanic membrance

    Cone of light

  • Consists of three partsTympanic cavity Auditory tube Mastoid antrum and mastoid cells

    Middle ear

  • Position: An irregular air-filled cavity locates within the temporal bone, and lies between the tympanic membrane and the lateral wall of the inner ear .It contains the auditory ossicles, ligaments, muscles, vessels and nerves.Tympanic cavity

  • Middle ear

    Boundaries: (1) Roof or tegmental wall : (2) inferior wall or jugular wall: separates the cavity from superior bulb of internal jugular v.

  • (3) Anterior wall or carotid wall : Upper opening for tensor tympani m. lower opening for auditory tube (4) Posterior wall or mastoid wall : Aditus of mastoid antrum: Pyramidal eminence . Tympanic cavity

  • (5) lateral wall or membranous wall :is formed by tympanic membrane epitympanic recess Middle ear

  • (6) Medial wall or labyrinthine wall : promontory Fenestra vestibuli Fenestra cochleae : covered by secondary tympanic membrane . Middle earProminence of facial canal :

  • 2. Auditory tube : Middle earIn childhood: shorter, wider and more horizontal than in adultBony part : posterolateral 1/3 ,open into the anterior wall of tympanic cavityCartilaginous part : anteromedial 2/3, open into the nasopharynx

  • 3. Mastoid antrum and mastoid cellsMiddle ear

  • 2content of tympanic cavity (1)auditory ossicles 3 malleus incus stapes

    Middle ear2 tensor tympani stapedius

  • Internal ear Position: lies in the petrous part of the temporal bone, and consists of two parts:

  • Internal ear The bony labyrinth is composed of the compact bone, and the latter, a series of communicating membranous sacs and ducts, is contained within the bone labyrinth. The membranous labyrinth is filled with endolymph ,The space between the membrnous and bony labyrinth is filled with perilymph .

  • bony labyrinth Cochlea :Vestibule :Bony semicircular canals

  • bony labyrinth

    (1) Cochlea : Cochlear spiral canal Modiolus Osseous spiral lamina Scala vestibuli Scala tympani

  • bony labyrinth

    (2) Vestibule: is the central part of bony labyrinthand is medial to the tympanic cavityit has 4 walls On its lateral wall fenestra vestibuli fenestra cochleae. The medial wall is the fundus of the internal acoustic meatus

  • bony labyrinth

    (2) Vestibule:On its anterior wall, a large opening communicates with the scale vestibuli of cochlea. On the posterior wall 5 opennings of emicircular canals.

  • bony labyrinth

    (3) Bony semicircular canals: three in number, the ant., post., and lateral simple bony crusampullar bony crura bony ampulla common bony crus

  • 2. Membranous labyrinth

    (1) Cochlear duct : in cochlear spiral canal (2) Utricle and saccule : in vestibule (3) Semicircular ducts :

  • (1) Cochlear duct : superior wall : vestibular wall inferior wall : tympanic wall or basilar membrane spiral organ Corti lateral wall:labyrinth

    2. Membranous labyrinth

  • receptors of balance, respond to linear acceleration and deceleration

    (2) Utricle and saccule : Connected to each other by utriclosaccular duct macular utricli macular sacculi Membranous labyrinth

  • sacculeUtricleCochlear ductSemicircular ducts

  • (3) Semicircular ducts :membranous ampullae crista ampullaris Membranous labyrinth receptor of balance, which respond to rotation of the head

  • The Vestibulocochlear Organ

    Internal acoustic meatus structures passing through it Facial nerve vestibulocochlear nerve vessels of labyrinth

  • The position of internal ear

  • Conduction of sound

    1 Air conductive pathway brain2

  • Receptors of balance Receptor of hearingBony labyrinth: Bony semicircular canalsVestibuleCochleaMembranous Abyrinth Cochlear ductSemicircular ductsUtriclesacculeReceptorscrista ampullarisspiral organ

    The summary

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  • Fig.

  • Fig.

  • Corti

  • Facial n.Veastibular n.Cochlear n.

  • 1.

  • Fenestra cochleaePromontory Prominence of facial canalPyramidal eminenceFenestra vestibuli

  • Conduction of sound