Ear.2 Flashcards
What does the Inner Ear consist of?
bony labyrinth
membranous labyrinth
What membranes is the bony labyrinth linked to?
round window- vestibular
oval- cochlear
What does the Bony Labyrinth consist of?
bony cochlea
bony vestibule
bony semi-circular canals
What is the fluid that fills the membranous labyrinth?
endoylmph
What is the role of sensory receptors within the inner ear?
responds to movement and vibrations
What are the features of the membranous cochlea?
snail, endolymph filled, organ of corti, receptor cell with base nerve
Organ of Corti function?
detect sound
Where does the base nerve branch off from?
vestibulocochlear nerve
What are the features of the membranous vestibule?
two sac-like structures- maintains balance
connects cochlea—-semi-circular canals
endolymph and sensory cells
What does the sensory cells in the membranous vestibule do?
maintain balance when standing still
Utricle-
horizontal plane, feedback
Saccule-
vertical plane, feedback
What does endolmph movement generate?
feedback to receptors (maculae)- aids orientation when stationary
What is vestibular syndrome?
secondary to head trauma/ear infections- idiopathic, older
What are the features of membranous semi-circular canals?
three interconnecting canals, endolymph
What are the connecting cells within membranous semi-circular canals connected to?
vestibule- ampulla
Ampulla-
jelly-like substance filled- sensory cupula
maintains balance when moving
Balance-
ultricle/ saccule in vestibule
contains cilia and otoliths- calcium carbonate
What does otoliths do?
detects endolymph movement
Movement-
semi circular canal positions correspond to three plains of movement
L/R
Up/Down
Side/Side
cilila- within cupula
What does cilia do?
detects movement of endolymph, within cupula
