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Anatomy > Ear > Flashcards

Ear Flashcards

1
Q

NS to upper 2/3 of lateral pinna

A

Auriculotemporal

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2
Q

NS to lower 1/3 of lateral pinna

A

Great auricular

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3
Q

NS of upper 2/3 of medial pinna

A

Lesser occipital

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4
Q

NS to lower 1/3 of medial pinna

A

Great auricular

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5
Q

NS to root of auricle

A

Auricular branch of vagus

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6
Q

BS to auricle

A

Posterior auricular

Superficial temporal

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7
Q

Lymphatic drainage of auricle

A

Preauricular

Postauricular

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8
Q

BS of external acoustic meatus

A

Outer - superficial temporal, posterior auricular

Inner - deep auricular branch of maxillary

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9
Q

NS of external acoustic meatus

A

Ant. - auriculotemporal

Post. - auricular branch of vagus

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10
Q

BS of tympanic membrane

A

O- deep auricular of maxillary
I- anterior tympanic branch of maxillary
Posterior tympanic of stylomastoid of posterior auricular

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11
Q

Venous drainage of tympanic membrane

A

O- external jugular vein

I- transverse sinus

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12
Q

Lymphatic drainage of tympanic membrane

A

Preauricular

Retropharyngeal

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13
Q

NS of tympanic membrane

A

O- auriculotemporal + auricular branch of vagus

I- tympanic branch of glossopharyngeal

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14
Q

Roof of middle ear

A

Tegmen tympani

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15
Q

Floor of middle ear

A

Temporal bone

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16
Q

Anterior wall of middle ear

A
  1. Canal for tensor tympani
  2. Opening of auditory tube
  3. Posterior wall of carotid canal perforated by A).superior and inferior sympathetic caroticotympanic nerves and B).tympanic branch of internal carotid artery
  4. Bony part between canals is continued as processus cochleariformis which reaches upper part of malleus
17
Q

Posterior wall of middle ear

A
  1. Opening of aditus through which epitympanic recess connects with mastoid antrum
  2. Fossa incudis
  3. Pyramidal projection has a passage for tendon of stapedius
  4. Posterior canaliculus for chorda tympani nerve
18
Q

Lateral wall of middle ear

A
  1. Tympanic membrane
  2. Squamous temporal bone
  3. Petrotympanic fissure lodges anterior process of malleus and transmits tympanic branch of maxillary artery
  4. Anterior canaliculus for chorda tympani
19
Q

Medial wall of middle ear

A
  1. Promontory - bulge by first turn of cochlea grooved by tympanic plexus
  2. Round window
  3. Oval window
  4. Prominence of facial canal
  5. Prominence of lateral semicircular canal
20
Q

Contents of middle ear

A
  1. Ear ossicles
  2. Joints b/w ear ossicles
  3. Tensor tympani and stapedius
  4. Vessels
  5. Chorda tympani and tympanic plexus
21
Q

Malleus

A
  1. Head in epitympanic recess, articulates with body of incus
  2. Neck- against pars flaccida related to chorda tympani
  3. Anterior process - to petrotympanic fissure by anterior ligament
  4. Lateral process
  5. Handle attached to tympanic membrane
22
Q

Incus

A
  1. Large body - articulates with head of malleus

2. Long process - articulates with head of stapes

23
Q

Stapes

A
  1. Small head - articulates with incus
  2. Narrow neck - provides insertion to stapedius
  3. Two limbs/crura - attached to footplate
  4. Footplate - oval, fits into oval window
24
Q

Joints of middle ear

A
  1. Incudomalleolar joint - saddle joint

2. Incudostapedial joint - ball and socket

25
Q

Tensor tympani

A
  • lies in bony canal above auditory tube
  • muscle arises from walls of canal
  • tendon reaches medial wall of middle ear,
  • bends around processus cochleariformis.
  • inserts into handle of malleus
  • supplied by mandibular nerve
26
Q

Stapedius

A
  • lies in bony canal related to posterior wall of middle ear.
  • this canal is continuous with canal for facial nerve
  • canal opens into summit of pyramid
  • supplied by facial nerve
27
Q

Arterial supply of middle ear

A
  1. Anterior tympanic branch of maxillary A.
  2. Posterior tympanic branch of posterior auricular A.
  3. Petrosal and superior tympanic branch of middle meningeal A.
  4. Ascending pharyngeal A.
  5. Tympanic branches of internal carotid A.
28
Q

Venous drainage of middle ear

A

Superior petrosal sinus

Pterygoid venous plexus

29
Q

Lymphatic drainage of middle ear

A

Preauricular

Retropharyngeal

30
Q

Nerve supply of middle ear

A
  1. Tympanic branch of glossopharyngeal nerve

2. Superior and inferior caroticotympanic nerves

Anatomy (23 decks)

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