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Neuroanatomy 2 > Cranial Nerves (Quiz 2) > Flashcards

Cranial Nerves (Quiz 2) Flashcards

1
Q

Which cranial nerves are attached to the brainstem?

A

CN III-XII

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2
Q

What are the 4 axonal categories (same for spinal cord and cranial nerves)?

A

1) somatic sensory (pain, temp, mechanical, tactile)
2) visceral sensory (sensory input from organs and blood vessels)
3) visceral motor (preganglionic ANS axons)
4) skeletal motor (goes out to skeletal muscles with alpha and gamma motor neurons)

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3
Q

What 2 additional axonal categories do cranial nerves have?

A

1) special sensory (special anatomy or have their own pathway , ex: photoreceptor, olfactory receptor, or gustatory receptor)
2) pharyngeal motor (also called brachial motor, these are the muscles of larynx, pharynx, jaw, and face)

note: anything that moves the eyes or tongue is skeletal motor, but if its any other muscle of the face then it is pharyngeal motor

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4
Q

During development, the arrangement of the afferent and efferent spinal cord column is formed. The sulcus limitans is the border between the dorsal and ventral horns. _____________ function is always closest to the sulcus limitans. This pattern is seen in the brainstem

A

Visceral

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5
Q

The sulcus limitans runs along the floor of the ventricle. Sensory is ____________, motor is _________. Visceral is closest to the sulcus limitans as seen in the spinal cord.

A

lateral, medial

note: cell columns for the categories of fiber are NOT continuous in the brainstem- separate nuclei

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6
Q

T/F: nuclei correspond to the level of the attachment of the nerve

A

true

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7
Q

T/F: all types of axonal fibers are present at each brainstem level

A

false

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8
Q

T/F: no cranial nerve has axons from all 6 categories

A

true

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9
Q

Generally speaking, what are the 3 types of cranial nerves?

A

1) motor CNs (CN 3, 4, 6, 11, and 12)
2) special sensory CNs (CN 1, 2, and 8)
3) mixed CNs (CN 5, 7, 9 and 10)

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10
Q

What is A?

A

CN III

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11
Q

What is B?

A

CN IV

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12
Q

What is C?

A

CN V

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13
Q

What is D?

A

CN VI

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14
Q

What is E?

A

CN VII

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15
Q

What is F?

A

CN VIII

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16
Q

What is G?

A

CN IX

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17
Q

What is H?

A

CN X

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18
Q

What is I?

A

CN XII

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19
Q

What are the motor cranial nerves that originate in the brainstem?

A

CN 3, 4, 11, and 12

20
Q

The oculomotor nerve (CN 3) is a motor nerve with efferent to….

A

-levator palpebrae superioris
-medial, superior, and inferior rectus, and inferior oblique (4/6 extraocular eye muscles)

21
Q

The nuclei for CN III is in the rostral midbrain. What is the nucleus called?

A

oculomotor nucleus

22
Q

The oculomotor nucleus is a wedge shaped nucleus located at the anterior edge of the _________________

A

periaqueductal gray

23
Q

The accessory oculomotor or __________________ nucleus sits in the midline and is the ANS output to the ciliary ganglion and pupillary sphincter and ciliary muscle

A

Edinger Westphal

24
Q

The oculomotor nucleus to the levator palpebrae superioris innervates ________________

A

bilaterally

25
Q

The oculomotor nucleus to the superior rectus projects _______________

A

contralaterally

26
Q

The oculomotor nucleus to the medial, inferior rectus, and inferior oblique projects ____________

A

ipsilaterally

27
Q

What does the superior branch of the oculomotor nerve innervate?

A

superior rectus and levator palpabrae superioris

28
Q

What does the inferior branch of the oculomotor nerve innervate?

A

inferior rectus, medial rectus, and inferior oblique

29
Q

Which muscle elevates the eyeball?

A

superior rectus

30
Q

Which muscle raises the upper eyelid?

A

levator palpabrae superioris

31
Q

Which muscle depresses the eyeball?

A

inferior rectus

32
Q

Which muscle adducts the eyeball?

A

medial rectus

33
Q

Which muscle elevates, abducts, and laterally rotates the eyeball?

A

inferior oblique

34
Q

The trochlear nerve is a motor nerve and it innervates 1 extraocular muscle. Which muscle is it?

A

superior oblique

35
Q

Cells bodies for CN IV are located in the _____________ nucleus. It is located at the caudal midbrain at the level of the inferior colliculus

A

contralateral

36
Q

Which CN axons leave the nucleus, turn caudally in the periaqueductal gray and project posteriorly? This is the ONLY CN that leaves posterior brainstem

A

CN IV

37
Q

What is the only CN to originate entirely from a contralateral nucleus?

A

CN IV

38
Q

Which cranial nerve gets its name as it innervates the lateral rectus and abducts the eye?

A

CN VI

39
Q

What are the somatic CNs?

A

CN 3, 4, 6, and 12

40
Q

What is the nucleus called for CN IV?

A

trochlear nucleus

41
Q

Abducens fibers originate from the ___________ abducens nucleus

A

ipsilateral

42
Q

The abducens nucleus is located in the caudal ______ beneath the floor of the ____________. Adjacent to the abducens nucleus is the medial longitudinal fasciculus (MLF) and the motor axons of the facial nerve (CN VII). CN VII fibers wrap around the abducens nucleus forming the internal genu of the facial nerve. The abducens nucleus and the internal genu form the facial colliculus in the floor of the 4th ventricle

A

pons, 4th ventricle

43
Q

What is the nucleus for the accessory nerve?

A

ambiguous nucleus

44
Q

What does the accessory nerve innervate?

A

traps and SCM

45
Q

The hypoglossal nerve originates in the __________ nucleus which extends from the caudal to rostral medulla. This nucleus is directly adjacent to the midline of the medulla. On the floor of the 4th ventricle. It is also just medial to the large dorsal motor nucleus of the vagus

A

hypoglossal

46
Q

CN XII enters the tongue inferiorly innervating….

A

intrinsic and extrinsic tongue muscles

47
Q

The hypoglossal nerve fibers originate in the _____________ hypoglossal nucleus, axons project anteriorly and emerge as rootlets in a groove between the pyramid and olive

A

ipsilateral

Neuroanatomy 2 (31 decks)

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