Quals - Development of Inner Ear

differentiation of the inner ear begins during the ______ week of gestation

3rd week

inner ear reaches adult size and configuration by the ____________ month

6th month

placodes form early in embryonic life as thickened ____________________

epidermal plates

____________ forms into a capsule and divides to form a saccular division, which gives rise to the cochlea, and a utriclar division, which. forms semicircular canals

auditory placode

T or F: the vestibular portions of the inner ear develop earlier than the auditory portions

TRUE

the inner ear is formed from the?

entoderm (endoderm)

the inner ear initially forms as cartilage and then changes to bone by the ________ gestational week

23rd gestational week

what week do the cochlea and vestibule reach full size in their primitive form?

20th week

cochlear turns begin to develop around the _____ week and are complete by the _______ or _______ week

• 6th week

• 9th or 10th week

the otocyst begins its formation at the end of the ____________

first month

the utricle, saccule, and endolymphatic duct form from the __________________

otocyst

by the middle of the ________week:

- the scalae are forming

- semicircular canals reach adult size, including ampullae with the cristae forming inside

- maculae is forming within utricle and saccule

- the ducts are forming that connect the saccule with. the utricle and cochlear duct

8th week

what weeks does the organ of corti begin to form?

10th to 12th week

what week is the membraneous labyrinth adult like??

18th week

what week is the inner ear fully formed?

25th week