Special Sense Organs Part 4 Flashcards Preview

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Flashcards in Special Sense Organs Part 4 Deck (33)
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1
Q

T/F: The external acoustic meatus is about one inch in length and ā€œSā€ shaped.

A

True

2
Q

What bone contains the medial 2/3 of the external acoustic meatus?

A

temporal bone

3
Q

T/F: the external acoustic meatus is covered by skin for its entire length and terminates at the chorda tympani.

A

False; terminates at the tympanic membrane

4
Q

What is cerumen and what produces it?

A

earwax produced by modified sweat glands (not sebaceous glands)

5
Q

How is otoscopic examination of the external acoustic canal made possible?

A

Because the canal is not straight, examination is possible by pulling out, down, and forward on the lobule (toward the chin)

6
Q

What arteries supply the external ear?

A

posterior auricular branch of the external carotid artery, anterior auricular branch of the superficial temporal artery, and auricular branch from the occipital artery

7
Q

What nerves supply sensory info to the external ear?

A

auriculotemporal nerve of the ophthalmic division of the trigeminal, auricular branch of the vagus, and great auricular nerve (C2 and C3)

8
Q

What branches supply motor info to the external ear?

A

temporal and posterior auricular branches of the facial nerve

9
Q

What ganglion provides sympathetics to the external ear?

A

superior cervical ganglion

10
Q

What is the small space between the tympanic membrane and the inner ear?

A

middle ear

11
Q

What two parts are recognized in the middle ear?

A

tympanic cavity and epitympanic recess

12
Q

What are the 3 small bones found in the middle ear?

A

incus, malleus, and stapes

13
Q

What 2 muscles are found in the tympanic cavity?

A

stapedius and tensor tympani

14
Q

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

A

petrous part of the temporal bone

15
Q

A thin layer of bone separating the cavity of the middle ear from the internal jugular vein forms what boundary of the middle ear?

A

floor or jugular wall

16
Q

A small opening in the jugular wall allows the entrance of what nerve?

A

tympanic branch of the glossopharyngeal nerve

17
Q

T/F: the lateral or membranous wall of the middle ear is formed entirely by the tympanic membrane.

A

False; there is also a bony part of the lateral wall adjacent to the epitympanic recess.

18
Q

T/F: the posterior or mastoid wall of the middle ear is incomplete.

A

True

19
Q

What is the opening between the tympanic cavity and the mastoid air cells associated with the posterior (mastoid) wall?

A

the aditus of the mastoid antrum

20
Q

What is the opening that the tendon of the stapedius muscle passes through in the posterior wall of the middle ear?

A

pyramidal eminence

21
Q

T/F: there is an opening for the chorda tympani associated with the lateral wall of the middle ear?

A

False; posterior wall

22
Q

What wall separates the middle ear cavity from the internal carotid artery?

A

carotid wall

23
Q

What 3 openings exist in the carotid wall of the middle ear cavity?

A

a large opening for the pharyngotympanic tube, an opening for the tensor tympani to pass through, and a small opening for the chorda tympani to exit the cavity

24
Q

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

A

labyrinthine or medial wall

25
Q

What 5 landmarks are associated with the labyrinthine wall?

A

the promontory made by the cochlea, stapes attaches to the oval window, round window, prominence of the facial canal, and the lateral semicircular canal

26
Q

What landmark of the labyrinthine wall is covered by a plexus formed by the tympanic branch of CN IX and branches from the internal carotid plexus? What is this plexus called?

A

the promontory, an impression made by the cochlea;

tympanic plexus

27
Q

Mucous membranes of the middle ear, mastoid area, and pharyngotympanic tube are all supplied by what plexus?

A

tympanic plexus

28
Q

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

A

lesser petrosal nerve

29
Q

What landmark of the labyrinthine wall is an impression of bone formed by a canal conducting a major cranial nerve?

A

prominence of the facial canal (facial nerve)

30
Q

What 3 very small bones are located in the tympanic cavity?

A

malleus, incus, and stapes

31
Q

What is the largest of the middle ear bones which is in contact with the tympanic membrane?

A

malleus

32
Q

What bone transmits vibrations from the 1st and 3rd bones of the middle ear?

A

incus

33
Q

What bone of the middle ear is the 3rd bone? Its base sits against the oval window.

A

stapes