Unit VIII - Ear Pt. 1 Flashcards Preview

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Flashcards in Unit VIII - Ear Pt. 1 Deck (66)
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31

Where does sympathetic supply to the external ear come from?

Superior cervical ganglion

32

The middle ear is between what structures?

Tympanic membrane and inner ear

33

What are the two parts of the middle ear?

Tympanic cavity and epitympanic recess

34

What are the three small bones found in the middle ear?

Stapes, malleus, and incus

35

What two muscles are located in the tympanic cavity?

Stapedius and tensor tympani

36

What is the smallest muscle in the body?

Stapedius

37

What forms the roof/tegmental wall of the middle ear?

Petrous part of the temporal bone

38

What forms the floor/jugular wall of the middle ear?

Thin layer of bone separating the cavity from the internal jugular vein

39

The small opening in the floor/jugular wall of the middle ear serves what purpose?

Entrance for the tympanic branch of the glossopharyngeal nerve

40

What forms the lateral/membranous wall of the middle ear?

Almost entirely by tympanic membrane (slight bony part adjacent to epitympanic recess)

41

What wall of the middle ear is incomplete?

Posterior/mastoid wall

42

What is the opening between the tympanic cavity and the mastoid air cells?

Aditus of the mastoid antrum (in the posterior/mastoid wall)

43

What is the opening that the tendon of the stapedius muscle passes through and where is it located?

Pyramidal eminence; posterior/mastoid wall of middle ear

44

Where do we find the opening for the chorda tympani?

Posterior/mastoid wall of middle ear

45

The carotid wall of the middle ear separates the cavity from what vessel?

Internal carotid artery

46

What are the openings found in the carotid wall of the middle ear?

Large opening for pharyngotympanic tube
Opening for tensor tympani
Small exit for chorda tympani

47

Where does the chorda tympani enter and exit in the middle ear?

Enter - posterior/mastoid wall
Exit - carotid wall

48

What is the boundary between the middle ear and the inner ear?

Labyrinthine/medial wall

49

What is the impression made by the cochlea in the labyrinthine?

Promontory

50

What covers the promontory of the labyrinthine, and what makes it up?

Tympanic plexus; tympanic branch of C.N. IX, branches from the internal carotid plexus

51

What does the tympanic plexus that covers the promontory supply?

Mucous membranes of middle ear, mastoid area, and pharyngotympanic tube

52

Which nerve leaves the tympanic plexus and travels to the otic ganglion?

Lesser petrosal nerve

53

What bone attaches to the oval window on the medial wall of the inner ear?

Stapes

54

Where are the oval and round windows located?

Labyrinthine/medial wall

55

The prominence of the facial canal is an impression of bone that is formed by a canal conducting what nerve?

Facial nerve

56

In what wall does the lateral semicircular canal form a small impression?

Medial wall (labyrinthine)

57

Where are the ossicles located specifically?

Tympanic cavity

58

What is the largest auditory ossicle?

Malleus

59

What does the malleus contact?

Tympanic membrane

60

What is the function of the incus?

Transmit vibrations from malleus to stapes