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Embryology > Special Senses > Flashcards

Special Senses Flashcards

1
Q

what does the enoderm into the rhombencephalon form

A

otic placode

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2
Q

what week does development of the semicircular canal occur

A

during Week 6

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3
Q

what is the ampulla

A

dilated end on the semicircular canal

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4
Q

what does the crista ampullae contain
what are these for

A

sensory cells
balance

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5
Q

what are the fibres of the ampullae

A

vestibular fibres of cranial nerve 9

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6
Q

when does the spiral of the tubular part occur

A

6 - 8 weeks

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7
Q

what does the left over cochlear duct do

A

communicates with the saccualr

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8
Q

what is the lining of the duct called
what is it formed by

A

neurepitheloium
the organ of corti

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9
Q

what is the function of organ of corti

A

functional unit of sound

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10
Q

what happens to the organ of corti

A

whole structure vaculosies into two aras

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11
Q

what happens to the cochlear duct

A

circular to triangular

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12
Q

what happens to the basement membrane

A

all uniform - then some start to lengthen and become more columnar then the side attached to the spiral ligament and close to the scala vestibuli are no longer membrane but rather vesticular membrane

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13
Q

what happens to the scala tympani and the scalal vestibuli

A

these valculise and become hollow chambers

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14
Q

what happens to the spiral ligament

A

it appear then it becomes larger

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15
Q

what is the modiolus

A

bony structure it is the part between the scala vestibuli and the scala tympani

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16
Q

what goes into the scala vestibuli and the scala tympani

A

extracellular fluid ech slightly different

17
Q

what are the outer ridge and inner ridge of the epithelial part

A

INNER FORMS A SPIRAL LIMBASE AND CONNECTS TO THE TECTORAL MEMBRANE (black bit)
outer is a hair like structure

18
Q

what two arches makes the middle ear

A

first and second

19
Q

what happens around the auditory ossicles

A

condensation occurs and the mesnhyme around the cartilgaous precuros will degrade to form a cavity (enodericmal lining)

20
Q

how is the tympanic membrane formed

A

invagination of the ectoderm will start to join the endodermal projection

21
Q

when the mesnehyme goes away what is left

A

some ligament attach to allow mvoement

22
Q

how is the metal plug formed
month

A

epithelial cells proliferate to form the meatal plug

23
Q

what happens to the plug at month 7

A

dissolves and contributes to the eardrum

Embryology (13 decks)

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