Presentation of ent vestibular anatomy and physiology

ENT

1. Anatomy of vestibular canal D S VARSHA PHASE III MBBS NMCRI

2. Vestibular system Consist of 3 semicircular canals and 2 otolith organs The 3 semicircular canals are arranged perpendicular to each other They are superior, posterior, lateral which are mainly responsible for Angular acceleration The 2 otolith organs are Utricle and Saccule, mainly responsible for Linear acceleration

3. Peripheral receptors There are two peripheral receptors Cristae and Maculae CRISTAE DEFINITION : Structure located in Ampullated end of three semicircular canals. FUNCTION : Responsible for Angular acceleration i.e rotation of head MACULAE DEFINITION : The sensory organs of Utricle and Saccule. FUNCTION : Responsible for Linear acceleration

4. There are two types of Hair cells Type 1 Hair cells They are flask shaped hair cells with single cup like nerve termial surrounding the base Type II Hair cells They are cylindrical shaped with multiple nerve terminal at base From the upper surface of each cell rises Stereocilia (transduction process) and thick single Kinociliium (linkage conveying mechanical displacement). WELCOME5

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