Vestibular System Flashcards
Inputs of the vestibular system
visual
pressure receptors in the feet
vestibular organ in the inner ear
Where is the vestibular organ in the ear and what is it called
In the temporal bone near the ear and is called the posterior labyrinth
Wh]]]What are the 5 organs in the posterior labyrinth
Utricle, saccule and the 3 semi circular canals (anterior, posterior and lateral)
What is connected to the utricle
the 3 semi circular canals and the saccule
Which 2 canals are connected
Anterior and posterior
What is connected to the saccule
the utricle and the cochlear
what liquid is outside the membranous labyrinth
perilymph
what liquid is inside the membranous labyrinth
endolymph
What are the 2 types of hair cell and which is more abundant, how direct is the afferent and efferent inputs and outputs
type 1, more abundant, direct afferent and indirect efferent
type 2 is direct afferent and efferent
What are the otolith organs
utricle and saccule
What are otoliths
carbonate crystals
Where is the macula in utricle
Lower part
Where is the macula in saccule
side pointing to the spiral of the cochlear
what is found in the otolith organs and what are the otolith organs (3)
hair cells, otoliths and a gelatinous matrix, the saccule and utricle
Where are otoliths found in the otolith organs
On top of the gelatinous matrix inside the saccule and utricle
What is the purpose of the otolith crystals in the saccule and utricle
When you move your head the move on the gelatinous matrix and apply levels of pressure to the hair cells below deflecting them
What are striola and where is it found
Opposing hair bundle polarities, found in the centre of the otolith organs (saccule and utricle)
Direction of the kinocilium in the utricle, and how do they depolarise
facing towards each other, depolarise when hair deflects in the direction of the striola
Direction of the kinocilium in the saccule, and how do they depolarise
away from each, deflection away from the striola depolarises it
Where are kinocilium facing towards the striola found
Utricle
Where are kinocilium facing away from the striola found
Saccule
Where is the cupula of the semi circular canal
in the wider parts of the semi circular canal, closes these wider bits off
what are the longest cilium known as
Kinocilia
What is the ampulla of the semi circular canal
inside of the cupula
Where are hair cells found in the semi circular canal
in the crista of the ampulla inside the cupula
What is the cupulla
A kind of gel but not as thick as the gelatinous matrix of the otolith cells
How are hair cells in the endolymph deflected
When we move the endolymph pushes against the cupula which deflects the hair cells
What direction is the anterior semi circular canal (say degrees for ease and straight ahead is 0) and what plane
about 45 degrees either way vertical
What direction is the posterior semi circular canal (say degrees for ease and straight ahead is 0) and what plane
225 degrees either way, vertical
What direction is the lateral semi circular canal (say degrees for ease and straight ahead is 0) and what plane
90 degrees and horizontal
What is the blood supply to the vestibular organ
Anterior inferior cerebellar artery (AICA)
2 afferent vestibular nerves?
superior and inferior vestibular nerves