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Neurology > Lab 8 > Flashcards

Lab 8 Flashcards

1
Q

motor V nucleus

A

mastication in pons medial to principal sensory

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2
Q

spinal V nucleus

A

pain and temp

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3
Q

principal sensory V

A

touch and discrim

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4
Q

mesencephalic V

A

pressure

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5
Q

What level at when see inferior olives?

A

middle medulla

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6
Q

medial longitudinal fasciculus

A

connects the cranial nerve nuclei III (Oculomotor nerve), IV (Trochlear nerve) and VI (Abducens nerve) together, and integrates movements directed by the gaze centers (frontal eye field) and information about head movement (from cranial nerve VIII, Vestibulocochlear nerve). It is an integral component of saccadic eye movements as well as vestibulo-ocular and optokinetic reflexes.

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7
Q

What will lesion of MLF cause?

A

internuclear opthalmoplegia

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8
Q

Where will eyes look if complete 3rd nerve palsy from a infarct that does NOT involve the lower pons but does knock out the MLF?

A
  • abducens nerve is uninvolved by the lesion so both eyes fixed looking laterally (abducted) - also will have blown pupils initially from unopposed sympath input to iris (remember CN3 is involved in pupil constriction)
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9
Q

CNIII nuclei

A
  • oculomotor nuclei - motor neuron input to extraocular muscles (medial, inferior, superior rectus muscles and inferior oblique - Edinger-Westphal - parasympathetic input to iris and lens
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10
Q

Where is the oculomotor nuclei?

A

midbrain when can see red nucleus

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11
Q

Where is the Edinger-Westphal nuclei?

A

midbrain when can see red nucleus

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12
Q

Where does the trochlear nerve exit?

A

from dorsal brainstem at pontomesencephalic jxn

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13
Q

Where is the trochlear nucleus?

A
  • caudal midbrain (at level of decussation of the SCP NOT at level of red nucleus) - buried in the MLF
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14
Q

What is the course of the trochlear nerve?

A

lower motor neurons lie in ventral caudal midbrain at level of descussation of SCP, fibers descend, move dorsally, and cross at the dorsal side of the periaqueductal gray and exit from the posterior then move ventrally around the brainstem and join up with 6 & 3 and exit through superior orbital fissure

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15
Q

Where does the trigeminal nerve ganglion lie?

A

outside the dura at the base of the brain

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15
Q

How do pain and temperature fibers from the face travel?

A

descend from entry in pons down into medulla and upper spinal cord ending in spinal trigeminal nucleus

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15
Q

Where do the divisions of the trigeminal nerve exit?

A
  • ophthalmic division exits from superior orbital fissure - maxillary division exits from foramen rotundum - mandibular division exits from foramen oval
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15
Q

How do pain and temperature fibers from the face travel?

A

descend from entry in pons down into medulla and upper spinal cord ending in spinal trigeminal nucleus

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16
Q

What are the four trigeminal nuclei?

A
  • motor nucleus of V - spinal trigeminal - mesencephalic V - primary sensory nucleus of V
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16
Q

What are the four trigeminal nuclei?

A
  • motor nucleus of V - spinal trigeminal - mesencephalic V - primary sensory nucleus of V
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17
Q

How do pain and temp fibers from face travel?

A

descend from entry in pons down into medulla and upper spinal cord ending in spinal trigeminal nucleus CROSSES and ASCENDS to join spinothalamic fibers

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18
Q

Which nucleus of CNV processes proprioceptive info?

A

principal trigeminal sensory nucleus

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19
Q

Which nucleus of CNV is involved in proprioception of the face?

A

mesencephalic nucleus

(reeive proprioceptive info from mandible and send projections to motor trigem nucleus to mediate monosynaptic jaw jerk reflexes

20
Q

Where is the spinal trigeminal nucleus found?

A

in medulla

21
Q

Where is the primary sensory nucleus of V found?

A

in pons

22
Q

Where is the mesencephalic nucleus of V found?

A

upper pons

23
Q

Where is the trigeminal MOTOR nucleus found?

A

in pons (medial to the primary sensory nucleus of V)

24
Q

Where is the abducens nucleus located?

A

in lower pons

25
Q

Why is the abducens nerve particularly susceptible to disease?

A

it travel far from base of pons to eye muscles in course subject to diseases like diabetes - nucleus lies at other end of pons from its sibling the MLF connection is long and can be injured by diseases like MS

26
Q

What does the abducens nerve control?

A

lateral rectus muscle

27
Q

Where does the facial nerve exit?

A

cerebellopontine angle

28
Q

Where is the facial nucleus location?

A

caudal pons

29
Q

Where is the solitary nucleus?

A

in the dorsal medulla

30
Q

Where do Schwannoma have a tendency to form?

A

penchant to form on vestibular nerve when it exits the skull

31
Q

What are the nuclei of the glossopharyngeal nerve (CNIX)? Where are they found?

A

solitary nucleus and nucleus ambigus both are found in the medulla

32
Q

Major functions of vagus

A
  • providing preganglionic parasympathetic motor fibers to most of body - supplying motor control over swallowing and your vocal cords
33
Q

Where do parasympathetic fibers of vagus nerve originate from?

A

dorsal motor nucleus of vagus

34
Q

Where do the pharyngeal muscle lower motor neurons reside?

A

nucleus ambigus

35
Q
A

occulomotor nucleus (of CNIII)

36
Q
A

Edinger-Westphal nucleus (of CNIII)

37
Q
A

trochlear nucleus

(notice this is not at level of red nucleus - it’s at the level of the SCP decussation)

38
Q
A

spinal trigeminal nucleus in medulla

39
Q
A

primary sensory nucleus of V (in pons)

40
Q
A

mesencephalic nucleus of V (in upper pons)

41
Q
A

motor nucleus of V (in the pons medial to the principal sensory nucleus of V)

42
Q
A

abducens nucleus in lower pons

43
Q
A

facial nucleus

44
Q
A

solitary nucleus (CNVII)

45
Q
A

cochlear nuclei (located in rostral medulla)

46
Q
A

vestibular nuclei (in rostral medulla)

47
Q
A

solitary nucleus (from CNIX glossopharyngeal) in medulla

48
Q
A

nucleus ambiguus (CNIX) in medulla

49
Q
A

dorsal motor nucleus of vagus nerve

50
Q
A

nucleus ambiguus (again) this time as component of vagus nerve

51
Q
A

solitary nucleus again! this time as part of vagus

52
Q
A

hypoglossal nucleus in medulla

Neurology (10 decks)

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