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Spinal Anatomy I - Exam 3 > Auricle of the Ear > Flashcards

Auricle of the Ear Flashcards

1
Q

What parts make up the external ear?

A
  • auricle

- external acoustic/auditory meatus

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2
Q

What type of cartilage forms the auricle?

A

elastic cartilage

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3
Q

What features are commonly observed in the skin of the ear?

A
  • hair follicles
  • sweat glands
  • sebaceous glands
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4
Q

What is the helix of the external ear?

A

the rounded outer rim of the auricle

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5
Q

What is the name given to the anterior fold of the helix above the tragus?

A

the crus of the helix

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6
Q

What is the spine of the helix of the external ear?

A

the palpable anterior projection of the helix

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7
Q

What is the scaphoid fossa of the external ear?

A

the depression under the rim of the helix

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8
Q

What is the rounded inner rim of the external ear?

A

antihelix

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9
Q

What is the superior crus of the antihelix?

A

the rounded linear upper extension of the antihelix

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10
Q

What is the inferior crus of the antihelix?

A

the rounded linear lower extension of the antihelix

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11
Q

What is formed between the crura of the antihelix?

A

triangular fossa

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12
Q

What is the cymba concha?

A

the part of the concha between the helix and the inferior crus of the antihelix

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13
Q

What is the name of the cavity leading into the external auditory meatus?

A

concha

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14
Q

What is the name of the eminence anterior to the concha?

A

tragus

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15
Q

What is the really stupid name that we have to know for the tragus for this really, really dumb class?

A

goat’s beard

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16
Q

What is the name of the indentation between the tragus and antitragus?

A

intertragic incisure

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17
Q

What is the name of the rounded elevation superior to the lobule of the auricle?

A

antitragus

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18
Q

What is the name given to the fatty, suspensory, inferior part of the auricle?

A

lobule

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19
Q

What is the name given to the palpable posterior projection corresponding to the triangular fossa of the auricle?

A

eminentia triangularis

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20
Q

What is the name given to the palpable posterior projection corresponding to the concha of the auricle?

A

eminentia concha

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21
Q

What is the name of the palpable posterior projection of the eminentia concha of the auricle?

A

ponticulus

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22
Q

Identify the extrinisic muscles of the auricle.

A
  • anterior auricular
  • superior auricular
  • posterior auricular
  • temporoparietalis
23
Q

Which C.N. will innervate the muscles of the auricle?

A

facial nerve

24
Q

What is the innervation of the extrinisic muscles of the auricle?

A

posterior auricular and temporal branches of the facial nerve

25
Q

What innervates the anterior auricular, superior auricular, and temporoparietalis muscles?

A

temporal branch of the facial nerve

26
Q

Posterior auricular branches of the facial nerve will supply motor fibers to which extrinsic auricular muscle?

A

posterior auricular muscle

27
Q

What specific branches of the facial nerve plexus provide motor innervation to the scalp?

A
  • temporal
  • zygomatic
  • posterior auricular
28
Q

What muscles associated with the scalp will be innervated by the temporal, zygomatic, and posterior auricular nerves?

A
  • epicranius

- superior group of muscles of the ear

29
Q

Which branches of the external carotid artery supply the auricle?

A
  • occipital a.
  • posterior auricular a.
  • superficial temporal a.
30
Q

What veins will drain the region of the auricle?

A
  • occipital v.
  • posterior auricular v.
  • superficial temporal v.
31
Q

Which type of sensory pathway will convey info in spinal and cranial nerves from the auricle?

A

somatic afferent (SA) pathways

32
Q

Branches of nerves from what parts of the CNS will innervate the auricle?

A

both cranial and spinal nerves

33
Q

What makes the sensory pathways from the external ear so difficult to determine?

A

the ear is formed at the junction of somite and branchial arch which carries over into the dual innervation by spinal and cranial nerves

34
Q

Sensory innervation of the auricle is derived from which nerves?

A
  • greater auricular (ventral rami C2, C3)
  • lesser occipital nerve (ventral rami C2, possibly C3)
  • auriculotemporal nerve (mandibular division, trigeminal)
  • posterior auricular cutaneous nerve (facial)
  • auricular nerve (vagus)
35
Q

Sensory innervation of the auricle is derived from which somite-derived nerve branches?

A
  • greater auricular (ventral rami C2, C3)

- lesser occipital nerve (ventral rami C2, possibly C3)

36
Q

What part of the external ear will be innervated by cervical spinal nerves?

A

the cranial and lateral surface of the auricle

37
Q

The auricle is innervated by branches of which cranial nerves?

A

trigeminal, facial, and vagus

38
Q

The auricle transmits sensory innervation via which specific cranial nerve branches?

A
  • auriculotemporal nerve (mandibular division, trigeminal)
  • posterior auricular cutaneous nerve (facial)
  • auricular nerve (vagus)
39
Q

What part of the external ear sends SA fibers in the trigeminal nerve?

A

the tragus and crus of the helix of the auricle

40
Q

Peripheral sensory processes from sensory receptors in the tragus and crus of the helix of the auricle are conveyed in what C.N.?

A

trigeminal nerve

41
Q

Peripheral sensory processes from C.N. V are primarily derived from pseudounipolar afferent neuron cell bodies located in which ganglion?

A

semilunar/trigeminal/Gasserian ganglion

42
Q

Central sensory processes from pseudounipolar neurons associated with sensation from the tragus and crus of the helix of the auricle synapse on secondary neurons in what locations?

A

the principal sensory nucleus of the trigeminal and spinal trigeminal nucleus

43
Q

Central sensory processes from the semilunar/trigeminal/Gasserian ganglion are conveyed to the pons in what structure?

A

the sensory root of the trigeminal nerve

44
Q

The sensory root of the trigeminal nerve will have an apparent origin from what part of the encephalon?

A

the pons

45
Q

Which branch of the facial nerve receives peripheral sensory processes from the external ear?

A

the posterior auricular cutaneous nerve

46
Q

What part of the external ear sends SA fibers in the facial nerve?

A

the concha and eminentia concha of the ear and mastoid region of the temporal bone

47
Q

Peripheral sensory processes from receptors in the concha and eminentia concha of the ear and mastoid region of the temporal bone are conveyed in what cranial nerve?

A

facial nerve

48
Q

Peripheral sensory processes from receptors in the concha and eminentia concha of the ear and mastoid region of the temporal bone are convey SA info in C.N. VII to what ganglion?

A

genicular/geniculate ganglion

49
Q

What is the nucleus of termination for central sensory processes from pseudounipolar neurons in the geniculate ganglion associated with info from the concha and eminentia concha of the ear and mastoid region of the temporal bone?

A

the spinal trigeminal nucleus

50
Q

Which branch of the vagus nerve receives peripheral sensory processes from the external ear?

A

the auricular nerve

51
Q

What part of the external ear sends SA fibers in the vagus nerve?

A

the external auditory meatus, earlobe, and tympanic membrane

52
Q

Peripheral sensory processes from receptors in the external auditory meatus, earlobe, and tympanic membrane are conveyed in what C.N.?

A

vagus nerve

53
Q

Peripheral sensory processes from receptors in the external auditory meatus, earlobe, and tympanic membrane are conveyed from C.N. X to what other C.N.?

A

facial nerve

54
Q

Peripheral sensory processes from receptors in the external auditory meatus, earlobe, and tympanic membrane are conveyed in C.N. VII to what ganglion?

A

the spinal trigeminal nucleus

Spinal Anatomy I - Exam 3 (94 decks)

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