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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


Vestibular system

Semicircular canals and ducts

anterior

posterior

lateral



Vestibular system

Receptors in the labyrinth

2 maculae (sacculus, utriculus)

3 crests (in the 3 ampullae)

- Secondary sensory epithelium

- bipolar ggl. cells

vestibular ggl. (Scarpa)


Vestibular system

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


Vestibular system

Cristae ampullares – angular acceleration

Head

Endolymph

Tehetetlenségi

áramlás


Vestibular system

Cristae ampullares – angular acceleration



Vestibular system

Maculae - linear acceleration

otoconia


Vestibular system

Maculae cribrosae

Macula cribrosa superior

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

Macula cribrosa media

(N. saccularis)

Macula cribrosa inferior

(N. ampullaris post.)


Vestibular system

canalis facialis

area vestibularis sup.

foramen

singulare

area cochlearis

area vestibularis inf.


Vestibular scarpa s ganglion
Vestibular (Scarpa’s) ganglion

Bipolarneurons


Vestibular system

nucl. vestibularis

-superior (Bechterew)

-inferior (Roller)

-medialis (Schwalbe)

-lateralis (Deiters)


Eye movements also cajal and darkschewitsch nuclei
Eyemovements(also: Cajal and Darkschewitschnuclei)

MLF



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.