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Cummings > C27 - Anatomy of Temporal Bone, External Ear, and Middle Ear > Flashcards

C27 - Anatomy of Temporal Bone, External Ear, and Middle Ear Flashcards

1
Q

Articulations of temporal bone

A

sphenoid
parietal
occipital
zygomatic

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2
Q

superior face of pyramid

A

middle fossa floor

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3
Q

posterior face of pyramid

A

anterior limit of posterior fossa

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4
Q

antero-inferior face of pyramid

A

muscle attachments of neck and infratemporal fossa

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5
Q

base of pyramid

A

muscular-cutaneous side of the head

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6
Q

Four embryologic components of temporal bone

A

squamous
mastoid
petrous
tympanic

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7
Q

lateral wall of middle fossa

A

squamous part

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8
Q

bony roof of glenoid fossa

A

zygomatic process

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9
Q

anterior extension of squamous

A

zygomatic process

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10
Q

insertion of temporalis muscle to squamous

A

outer cortex

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11
Q

insertion of masseter to squamous

A

zygomatic process

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12
Q

horizontal line formed on the most inferior insertion by temporalis muscle on squamous

A

temporal line

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13
Q

aligned with zygomatic process; used as a surface landmark to estimate middle fossa floor

A

temporal line

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14
Q

average offset of temporal line

A

4.7mm

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15
Q

bulbous bony structure shaped by the expansion of air filled spaces within

A

mastoid part of temporal bone

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16
Q

mastoid tip or process was due to

A

constant pull of scm and posterior belly of digastric

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17
Q

perforated by multiple small emissary vessels that drain from central air cell or antrum and form a depressed cribriform area at the anterior junction of mastoid with tympanic

A

mastoid cortex

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18
Q

evident near the posterior limit of the outer mastoid cortex

A

foramen of single emissary vein

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19
Q

evident on posterior medial aspect of temporal bone

A

sulcus of sigmoid sinus

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20
Q

froamen of single emissary vein communicates with

A

sulcus of sigmoid sinus

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21
Q

indictaed by a rough and irregular surface at the mastoid tip

A

site of scm insertion

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22
Q

insertion of posterior belly of digastric

A

medial to the mastoid tip, in a sulcus that terminates anteriorly at the stylomastoid foramen

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23
Q

sulcus for occipital artery

A

medial and parallel to digastric sulcus

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24
Q

base of petrous part of temporal

A

united with mastoid laterally

25
Q

apex of petrous part

A

oriented anteromedially between the occipital and sphenoid bones

26
Q

anterior surface of petrous

A

forms the posteromedial margin of middle fossa floor

27
Q

significant surface features of petrous medially

A

arcuate eminence

28
Q

arcuate eminence is formed by

A

prominence of scc and sulcus of superior petrosal sinus

29
Q

anterior of petrous, the junction of greater sphenoid wing, the musculotubal canal contains the

A

more superficial semicanal of the tensor tympani and a deeper semicanal of eustachian tube

30
Q

smooth depression at petrous apex

A

trigeminal ganglion

31
Q

posterior to trigeminal ganglion

A

foramina and sulci of the greater and lesser superficial petrosal nerves, running parallel to sphenoid suture line

32
Q

roof of middle ear and mastoid

A

located lateral to arcuate eminence

33
Q

posterior surface of petrous part is oriented

A

in the vertical plane that forms the anterior bony limit of the posterior fossa

34
Q

posterior surface of petrous framed by

A

sulci for sigmoid, superior petrosal, inferior petrosal sinuses

35
Q

center of posterior surface of petrous

A

porous acousticus

36
Q

fundus of porous acousticus

A

falciform (horizontal) crest
bill bar (vertical) crest
foramina of cn 7 and 8

37
Q

emerges from a depression superior and lateral to the acoustic meatus

A

subarcuate artery

38
Q

occupies the depression and opening located inferolaterally, known as operculum

A

endolymphatic sac and duct

39
Q

formed at the junction between the petrous and occipital bones

A

jugular foramen

40
Q

jugular formane is partitioned into

A 
pars nervosa (posterior)
pars venosa (anterior)
by the jugular spine
41
Q

inferior surface of temporal bone is irregular because

A

presence of multiple muscle attachments

42
Q

external aperture of cochlear duct is located

A

medial and anterior to the jugular spine within the pars nervosa

43
Q

marks the most superior limit of jugular foramen

A

external aperture of the cochlear aqueduct

44
Q

enters the jugular foramen adjacent to the opening of the cochlear aqueduct

A

glossopharyngeal nerve

45
Q

important inferior limit of dissection to protect the lower cranial nerves in the translabyrinthine approach to the internal auditory canal

A

cochlear aqueduct

46
Q

cochlear aqueduct opens into what structure at the cochlear base

A

scala tympani

47
Q

occupies a dome shaped compartment located lateral to the pars venosa of jugular foramen, directly under the middle ear space

A

jugular bulb

48
Q

located directly anterior to the jugular bulb depression which is separated by a wedge shaped bone called the keel

A

inferior foramen of the carotid canal

49
Q

tympanic cannaliculus penetrates the keel to transmit sensory and prganglionic parasympathetic fibers from the inferior ganglion of the glossopharyngeal nerve into the middle ear as the

A

jacobson nerve

50
Q

located anterior to the stylomastoid foramen

A

styloid process

51
Q

both are located at the anterior limit of digastric groove

A

styloid process and stylomastoid foramen

52
Q

eagle syndrome

A

odynophagia, dysphagia, foreign body sensation in the throat

53
Q

eagle syndrome brought about by

A

elongation or angulation of the styloid process, as a result of compression of cranial nerves or the ica

54
Q

froms the anterior wall and floor and part of the posterior wall and roof of the bony eac and the anterior wall of and floor of the middle ear

A

tympanic part of the temporal bone

55
Q

the anterior edge of the open ring fromed by the tympanic part of the temporal bone froms this structure within the eac

A

tympanosquamous suture line

56
Q

the anterior edge of the open ring formed by the tympanic part of the temporal bone froms this structure within the middle ear

A

petrotympanic suture line

57
Q

chorda tympani exits the ear through this structure

A

petrotympanic suture line

58
Q

this line serves as a land,ark for the main trunk of the facial nerve

A

tympanomastoid suture line, for,ed by the posterior edge of the tympanic ring which curves from the posterior eac inferiorly to within millimeters of the stylomastoid foramen

Cummings (1 decks)

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