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Vestibular system. Dr. Altdorfer Károly. Semicircular canals and ducts. anterior posterior lateral. Membranous labyrinth. Receptors in the labyrinth. 2 maculae (sacculus, utriculus) 3 crests (in the 3 ampullae). - Secondary sensory epithelium - bipolar ggl. cells.

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vestibular system

Vestibular system

Dr. Altdorfer Károly

slide2

Semicircular canals and ducts

anterior

posterior

lateral

slide5

Receptors in the labyrinth

2 maculae (sacculus, utriculus)

3 crests (in the 3 ampullae)

- Secondary sensory epithelium

- bipolar ggl. cells

vestibular ggl. (Scarpa)

slide6

I.

+

II.

-

+

Receptor cells

  • Macula and crista ampullaris
  • - Kinocilium (9x2 +2) and 40-100 stereocilia,
  • - Mechanoreceptors in the otolithmembrans
  • or in the cupula
  • - Type I.
  • Type II.
  • - Supporting cells
slide8

Cristae ampullares – angular acceleration

Head

Endolymph

Tehetetlenségi

áramlás

slide14

Maculae cribrosae

Macula cribrosa superior

(N. utricularis, Nn. ampullares ant. et lat.)

Macula cribrosa media

(N. saccularis)

Macula cribrosa inferior

(N. ampullaris post.)

slide16

canalis facialis

area vestibularis sup.

foramen

singulare

area cochlearis

area vestibularis inf.

slide19

nucl. vestibularis

-superior (Bechterew)

-inferior (Roller)

-medialis (Schwalbe)

-lateralis (Deiters)

meni re disease
Meniére-disease

Cause?

Probable cause: endolymph amount increases  enters perilymphatic spaces also  all hair cells (Corti organ, maculae, cristae) functionally altered.

Affects hearing and balance to a varying degree. It is characterized by episodes of severe vertigo (dizziness) and tinnitus (ringing in the ear or machine like sounds) and progressive hearing loss.

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