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

4. 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

6. 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).
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