Flashcards in Auricle of the Ear Deck (54):
1
What parts make up the external ear?
- auricle
- external acoustic/auditory meatus
2
What type of cartilage forms the auricle?
elastic cartilage
3
What features are commonly observed in the skin of the ear?
- hair follicles
- sweat glands
- sebaceous glands
4
What is the helix of the external ear?
the rounded outer rim of the auricle
5
What is the name given to the anterior fold of the helix above the tragus?
the crus of the helix
6
What is the spine of the helix of the external ear?
the palpable anterior projection of the helix
7
What is the scaphoid fossa of the external ear?
the depression under the rim of the helix
8
What is the rounded inner rim of the external ear?
antihelix
9
What is the superior crus of the antihelix?
the rounded linear upper extension of the antihelix
10
What is the inferior crus of the antihelix?
the rounded linear lower extension of the antihelix
11
What is formed between the crura of the antihelix?
triangular fossa
12
What is the cymba concha?
the part of the concha between the helix and the inferior crus of the antihelix
13
What is the name of the cavity leading into the external auditory meatus?
concha
14
What is the name of the eminence anterior to the concha?
tragus
15
What is the really stupid name that we have to know for the tragus for this really, really dumb class?
goat's beard
16
What is the name of the indentation between the tragus and antitragus?
intertragic incisure
17
What is the name of the rounded elevation superior to the lobule of the auricle?
antitragus
18
What is the name given to the fatty, suspensory, inferior part of the auricle?
lobule
19
What is the name given to the palpable posterior projection corresponding to the triangular fossa of the auricle?
eminentia triangularis
20
What is the name given to the palpable posterior projection corresponding to the concha of the auricle?
eminentia concha
21
What is the name of the palpable posterior projection of the eminentia concha of the auricle?
ponticulus
22
Identify the extrinisic muscles of the auricle.
- anterior auricular
- superior auricular
- posterior auricular
- temporoparietalis
23
Which C.N. will innervate the muscles of the auricle?
facial nerve
24
What is the innervation of the extrinisic muscles of the auricle?
posterior auricular and temporal branches of the facial nerve
25
What innervates the anterior auricular, superior auricular, and temporoparietalis muscles?
temporal branch of the facial nerve
26
Posterior auricular branches of the facial nerve will supply motor fibers to which extrinsic auricular muscle?
posterior auricular muscle
27
What specific branches of the facial nerve plexus provide motor innervation to the scalp?
- temporal
- zygomatic
- posterior auricular
28
What muscles associated with the scalp will be innervated by the temporal, zygomatic, and posterior auricular nerves?
- epicranius
- superior group of muscles of the ear
29
Which branches of the external carotid artery supply the auricle?
- occipital a.
- posterior auricular a.
- superficial temporal a.
30
What veins will drain the region of the auricle?
- occipital v.
- posterior auricular v.
- superficial temporal v.
31
Which type of sensory pathway will convey info in spinal and cranial nerves from the auricle?
somatic afferent (SA) pathways
32
Branches of nerves from what parts of the CNS will innervate the auricle?
both cranial and spinal nerves
33
What makes the sensory pathways from the external ear so difficult to determine?
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
Sensory innervation of the auricle is derived from which nerves?
- 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
Sensory innervation of the auricle is derived from which somite-derived nerve branches?
- greater auricular (ventral rami C2, C3)
- lesser occipital nerve (ventral rami C2, possibly C3)
36
What part of the external ear will be innervated by cervical spinal nerves?
the cranial and lateral surface of the auricle
37
The auricle is innervated by branches of which cranial nerves?
trigeminal, facial, and vagus
38
The auricle transmits sensory innervation via which specific cranial nerve branches?
- auriculotemporal nerve (mandibular division, trigeminal)
- posterior auricular cutaneous nerve (facial)
- auricular nerve (vagus)
39
What part of the external ear sends SA fibers in the trigeminal nerve?
the tragus and crus of the helix of the auricle
40
Peripheral sensory processes from sensory receptors in the tragus and crus of the helix of the auricle are conveyed in what C.N.?
trigeminal nerve
41
Peripheral sensory processes from C.N. V are primarily derived from pseudounipolar afferent neuron cell bodies located in which ganglion?
semilunar/trigeminal/Gasserian ganglion
42
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?
the principal sensory nucleus of the trigeminal and spinal trigeminal nucleus
43
Central sensory processes from the semilunar/trigeminal/Gasserian ganglion are conveyed to the pons in what structure?
the sensory root of the trigeminal nerve
44
The sensory root of the trigeminal nerve will have an apparent origin from what part of the encephalon?
the pons
45
Which branch of the facial nerve receives peripheral sensory processes from the external ear?
the posterior auricular cutaneous nerve
46
What part of the external ear sends SA fibers in the facial nerve?
the concha and eminentia concha of the ear and mastoid region of the temporal bone
47
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?
facial nerve
48
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?
genicular/geniculate ganglion
49
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?
the spinal trigeminal nucleus
50
Which branch of the vagus nerve receives peripheral sensory processes from the external ear?
the auricular nerve
51
What part of the external ear sends SA fibers in the vagus nerve?
the external auditory meatus, earlobe, and tympanic membrane
52
Peripheral sensory processes from receptors in the external auditory meatus, earlobe, and tympanic membrane are conveyed in what C.N.?
vagus nerve
53
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.?
facial nerve
54