Embryology Flashcards
Membranous labyrinth has _________
Bony labyrinth has _________
Endolymph
Perilymph
Membranous labyrinth develops from
Surface ectoderm
Parts of membranous labyrinth
3 Semi circular canals - superior , posterior , lateral
Crus commune
Utricle and saccule
Common opening btw superior and posterior SCC is known as
Crus Communis
SCC open into utricle and saccule through how many openings
5
Utricle and saccule gives 2 ducts that open into ____
Utricle and saccule aslo open into _______
Endolymphatic sac
Membranous cochlea / scala tympani
Membranous labyrinth function
Hearing and balance
Sensory end organ of hearing____
Sensory end organ of balance__
Organ of corti -hearing
Cristae in Scc and macule in utricle and saccule- balance
Cristae responsible for –Type of Acceleration ?
Macule “ “ “”””” “”””” “”””” “””””””” “””” “”””””?
Cristae - rotational
Macule - linear and head tilt and gravitational movement
High frequency sound sensed in
Low frequency sound sensed in
Base
Apex
Bony labyrinth develops from _____
And type of ossification_______
Mesoderm by enchondral ossification
Oval windows function
Conductive hearing
Abnormalities of oval windows
Otosclerosis
Vertigo — menieres congenital syphilis
Hypermobility of utricle and saccule is found in
Congenital syphilis
Round windows is covered by
Secondary tympanic memberan
Michel aplasia
Total non development of inner ear
Alexander aplasia
Deformity of basal turn high frequency affected
