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MBS217 > Anatomy Of The EAR > Flashcards

Anatomy Of The EAR Flashcards

1
Q

What three parts are the ear divided into?

A

External,Middle and Internal Ear

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2
Q

What is the Auricle also known as?

A

The Pinna

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3
Q

What is the Pinna?

A

It is a flashy cartilage which surrounds the entrance to the external acoustic meatus

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4
Q

What is the function of the Pinna?

A

It provides directional sensitivity and protects the opening of the canal

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5
Q

What is the external acoustic meatus?

A

It is an external passageway which ends at the tympanic membrane(eardrum) and is lined with projecting hairs and these hairs trap debris and provides an increased tactile sensitivity through their root hair plexus

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6
Q

What is the tynpanic membrane?

A

A thin semitransparent membrane sheer that separates external ear from the middle ear

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7
Q

What are the Ceruminous glands?

A

They are interumentary glands along the acoustic external meatus

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8
Q

What do the cerumnious glands secrete?

A

They secrete cerumen

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9
Q

What is the purpose of cerumen?

A

Keeps foreign objects away from the tynpanic membrane
Slows growth of micro organisms in the ear canal
Reduces chance of infection
Prevents water from lodging in the ear

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10
Q

What is the middle ear known as?

A

Tympanic cavity

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11
Q

What is the structure of the middle ear?

A

It’s an air filled chamber which is separated from the external ear by the tynpanic membrane

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12
Q

What is the purpose of the tympanic cavity?

A

It communicates with nasopharynx through the Eustachian tube and allows for equalization of pressures on either side of the eardrum and also communicates with the mastodon air cells through small connections

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13
Q

What are the auditory ossicles?

A

Malleus
Incus
Stapes

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14
Q

What is the purpose of the auditory ossicles?

A

They connect the eardrum with one of the receptors complexes of the inner ear through the oval window

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15
Q

What is the vibration of the tympanic membrane?

A

It converts arriving sound waves into mechanical movements
Then the auditory ossicles conduct the vibrations to inner ear
The ear drum is larger and heavier than oval window and considerable amplification happens so we can hear faint noises

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16
Q

What are the small muscles that protect the eardrum and ossicles from violent movements?

A

Tensor tympani muscle (It stiffens the eardrum)
Stapedius muscle (Reduces movement of the stapes at the oval window

17
Q

What does the inner ear do?

A

This is where sense of equilibrium and hearing happen as they are provided by receptors in the inner ear

18
Q

What are the superficial contours of the inner ear formed by?

A

Dense bone known as Bony Labryinth

19
Q

What is the purpose of Bony Labryinth?

A

It surrounds and protects membronous labyrinth(delicate and is an interconnected network of fluid filled tubes

20
Q

Where are the receptors of the inner ear found?

A

In the membrounous labyrinth

21
Q

What flows between Bony and membronous labyrinth?

A

Perilymph(which is a liquid that closely resembles csf)

22
Q

What does the membronous labyrinth contain?

A

It contains endolymph which is a fluid with electrolyte concentrations which are diffrent from those of typical body fluids

23
Q

What are the subdivisions of the Bony Labryinth?

A

Vestibulae
Semicircular canals
Cochlea

24
Q

What is the oval window?

A

It is a window formed by Collagen fibers and it connected at the base of the stapes

25
Q

What is the round window?

A

It is a thin membronous part that separates the perilymph from air spaces of the middle ear and it simply removes any excess pressure in the cochlear fluid

26
Q

What is is the Vesibulae?

A

It closes the sacculae and utricle and has receptors which provide sensations of gravity and linear accelerations

27
Q

What are the semicircular canals?

A

They contain semicircular ducts and receptors which are stimulated by the rotation of the head

28
Q

What is the Cochlea?

A

It contains cochlear ducts and is an elongated portion of the membranous Labryinth and the receptors provide hearing

29
Q

What is the cochlear duct?

A

Hair cells called oragn of Corti are situated here
It’s an elongated tubelike structure that is between the vestibular and tympanic duct

30
Q

Where does the organ or Corti sit?

A

The basilar membrane

31
Q

What is the purpose of the basilar membrane?

A

It separates the tympanic and cochlear duct

32
Q

What do the hair cells lack?

A

Kinocilia

MBS217 (28 decks)

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