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Anatomy > Cranial Nerves 2 > Flashcards

Cranial Nerves 2 Flashcards

1
Q

What modalities does CN V carry?

A

Special visceral efferent –> muscles of mastication

General somatic afferent –> sensation in face

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2
Q

What does the mesencephalic nucleus of CN V receive?

A

Proprioception

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3
Q

What does the chief sensory nucleus of CN V receive?

A

Discriminative touch

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4
Q

What does the spinal nucleus of CN V receive?

A

Pain and temperature

Conscious sensation from viscera supplied by CN IX & X

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5
Q

Which division of the trigeminal carried the motor root?

A

Mandibular (CN V3)

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6
Q

Where do the 3 divisions of the trigeminal exit the skull via to supply the face?

A

CN V1 - supraorbital notch/ foramen
CN V2 - infraorbital notch/ foramen
CN V3 - mental foramen

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7
Q

Where is the trigeminal ganglion found?

A

Meckel’s cave (dura mater) on the apex of the petrous temporal bone

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8
Q

If all three divisions of the trigeminal are affected, where must the lesion be?

A

Pons or cranial base

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9
Q

Which branches of the trigeminal pass through the cavernous sinus?

A

CN V1 & V2

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10
Q

Which opening in the skull does CN V1 pass through?

A

Superior orbital fissure

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11
Q

Which opening in the skull does CN V2 pass through?

A

Foramen rotundum

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12
Q

Which opening in the skull does CN V3 pass through?

A

Foramen ovale

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13
Q

What are the main branches of CNV1?

A

Frontal nerve
Lacrimal nerve
Nasociliary nerve

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14
Q

What does the frontal nerve divide into?

A

Supraorbital

Supratrochlear

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15
Q

What does the lacrimal nerve supply?

A 
Lacrimal gland (sensation and PNS secretomotor)
Skin of lateral and upper eyelid
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16
Q

What does the nasociliary nerve divide into?

A

Long ciliary

Anterior and posterior ethmoidal nerves

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17
Q

What does the nasociliary nerve continue as?

A

Infratrochlear nerve

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18
Q

Which nerve is the external nasal nerve a branch of?

A

Anterior ethmoidal

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19
Q

Why would you be worried if you saw a patient with shingles on the tip of their nose?

A

Supplied by external nasal branch of the anterior ethmoidal branch of the nasociliary branch of CNV1
The nasociliary nerve also supplies sensation to the cornea of the eye, therefore Shingles at the tip of the nose is a warning that the disease will also develop on the cornea

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20
Q

Which nerve supplies the conjuntiva and cornea?

A

CN V1

21
Q

What is the first limb of the corneal reflex?

A

CN V1 - nasociliary nerve

22
Q

What are the main branches of CN V2?

A

Zygomatic

Infraorbital

23
Q

What does the zygomatic nerve divide into?

A

Zygomaticofacial

Zygomaticotemporal

24
Q

Which foramen do the zygomatic branches pass through?

A

Inferior orbital fissure

25
Q

Which fossa is CN V3 found in?

A

Infratemporal

26
Q

Which fossa is CN V2 found in?

A

Pterygopalatine

27
Q

Which nerve supplies the skin over the angle of the mandible?

A

Great auricular nerve (C2, 3)

28
Q

What branches does CN V3 give?

A

Auriculotemporal
Buccal
Mental

29
Q

Name the 3 CN VII nuclei

A

Superior salivatory
Solitary
Facial

30
Q

What is the function of CN VII solitary nucleus?

A

Recieves taste from anterior 2/3 of the tongue via Chorda Tympani nerve

31
Q

What is the function of the CN VII superior salivatory nucleus?

A

Parasympathetic secretomotor to the lacrimal gland, nasal and oral cavities, submandibular and sublingual glands

32
Q

Which muscles does the motor nucleus of CN VII supply?

A

Muscles of facial expression
Stapedius
Stylohyoid
Posterior belly of digastric

33
Q

Where does the motor root of CN VII emerge?

A

The angle between the lower pons and the cerebellum (cerebellopontine angle)

34
Q

What is the effect if CN VII is damaged in the internal acoustic meatus?

A

Weakness in muscles of facial expression

Hyperacusis (stapedius weakened)

35
Q

What structures does CN VII enter the internal acoustic meatus with?

A

CN VIII

Labyrinthine artery

36
Q

Which foramen does CN VII pass through to supply the facial muscles?

A

Stylomastoid foramen

37
Q

Where are the cell bodies for taste fibres found?

A

Geniculate ganglion

38
Q

Which branches does CN VII give before entering the parotid gland?

A

Branch to supply occipitalis and auricular muscles

39
Q

Why is CN VII at risk of compression in foreceps delivery?

A

Mastoid process not formed

40
Q

Name the 5 branches of CN VII that supply the muscles of facial expression

A 
Temporal
Zygomatic
Buccal
Marginal mandibular 
Cervical
41
Q

What muscle does the cervical branch of CN VII supply?

A

Platysma

42
Q

Which surgeries may put the facial nerve at risk?

A

Surgery on parotid gland and submandibular gland

43
Q

What are the 2 limbs of the corneal reflex?

A

Afferent: V1
Efferent: VII

44
Q

What is the function of stapedius?

A

Dampens the movement of the stapes

45
Q

What is in the parotid gland alongside CNVII?

A

External carotid artery

Retromandibular vein

46
Q

Which muscles does the facial nerve supply?

A

Muscles of facial expression
Stylohyoid
Posterior belly of digastric
Stapedius

47
Q

How does bells palsy present?

A

Whole sided facial weakness

48
Q

Why does a stroke only present as lower face weakness?

A

Bilateral supply for upper half of head

49
Q

What are the signs if the facial nerve is injured within the petrous temproal bone?

A

Ipsilateral facial weakness
Hyperacucsis
Taste disturbances

Anatomy (14 decks)

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