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Vestibulocochlear Organ ---- SHANDONG UNIVERSITY Liu Zhiyu

Vestibulocochlear Organ ---- SHANDONG UNIVERSITY Liu Zhiyu. The Vestibulocochlear Organ. Parts: external ear middle ear internal ear. Conduct the sound wave 。. Contains the receptors of auditory and vestibular organs. External ear.

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Vestibulocochlear Organ ---- SHANDONG UNIVERSITY Liu Zhiyu

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  1. Vestibulocochlear Organ---- SHANDONG UNIVERSITY Liu Zhiyu

  2. The Vestibulocochlear Organ Parts: external ear middle ear internal ear Conduct the sound wave。 Contains the receptors of auditory and vestibular organs

  3. External ear The external ear consists of auricle external acoustic meatus tympanic membrane

  4. External ear 1. Auricle Helix Antihelix crura of antihelix triangular fossa Scapha auricular concha externalacoustic pore Tragus Antitragus auricular lobule

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

  6. External ear 3. tympanic membrane : Flaccid part : upper 1/4 Tense part : lower 3/4 Umbo of tympanic membrance Cone of light 鼓膜脐

  7. Middle ear Consists of three parts • Tympanic cavity • Auditory tube • Mastoid antrumandmastoid cells

  8. Tympanic cavity • 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.

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

  10. Tympanic cavity (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

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

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

  13. Middle ear 2. Aditory tube: Bony part : posterolateral 1/3 ,open into the anterior wall of tympanic cavity Cartilaginous part : anteromedial 2/3, open into the nasopharynx In childhood: shorter, wider and more horizontal than in adult

  14. mastoid cells Middle ear 3. Mastoid antrumand mastoid cells

  15. Middle ear 2）content of tympanic cavity (1)auditory ossicles： malleus incus stapes （2） tensor tympani stapedius

  16. bony labyrinth membranous labyrinth Internal ear Position: lies in the petrous part of the temporal bone, and consists of two parts:

  17. Internal ear The bony labyrinthis 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.

  18. bony labyrinth Cochlea Vestibule Bony semicircular canals

  19. bony labyrinth Scala vestibuli Scala tympani Modiolus Osseous spiral lamina (1) Cochlea: Cochlear spiral canal Modiolus Osseous spiral lamina Scala vestibuli Scala tympani

  20. bony labyrinth (2)Vestibule: is the central part of bony labyrinth，and is medial to the tympanic cavity，it has 4 walls On its lateral wall fenestra vestibuli fenestra cochleae. The medial wall is the fundus of the internal acoustic meatus

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

  22. bony labyrinth Anterior semicircular canal Posterior semicircular canal Lateral semicircular canal (3) Bony semicircular canals:  three in number, the ant., post., and lateral simple bony crus ampullar bony crura bony ampulla common bony crus

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

  24. 2.Membranous labyrinth labyrinth膜迷路 (1)Cochlear duct : superior wall : vestibular wall inferior wall : tympanic wall or basilar membrane spiral organ （Corti ） lateral wall:

  25. Membranous labyrinth (2) Utricle and saccule: Connected to each other by utriclosaccular duct macular utricli macular sacculi receptors of balance, respond to linear acceleration and deceleration

  26. Semicircular ducts Cochlear duct saccule Utricle

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

  28. The Vestibulocochlear Organ Internal acoustic meatus structures passing through it Facial nerve vestibulocochlear nerve vessels of labyrinth

  29. The position of internal ear

  30. the sound wave the external acoustic meatus tympanic membrane chain of auditory ossicles fenestra vestibuli perilymph within the scala vestibuli endolymph within cochlear duct spiral organ nerve impulse vestibulocochlear n. Conduction of sound • 1、Air conductive pathway： brain

  31. Macular utricli Macular sacculi The summary Bony labyrinth: Bony semicircular canals Cochlea Vestibule Membranous Abyrinth： Semicircular ducts Utricle、saccule Cochlear duct Receptors： crista ampullaris spiral organ Receptor of hearing Receptors of balance

  32. 前庭阶 鼓阶

  33. Cochlear n. Facial n. Veastibular n.

  34. Fenestra vestibuli Prominence of facial canal Pyramidal eminence Promontory Fenestra cochleae

  35. chain of auditory ossicles External ear Tympanic membrane fenestra vestibuli Internal ear spiral organ cochlear n. Conduction of sound

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