What are the following nuclei responsible for: 1. Mesencephalic 2. Spinal Nucleus of 5 3. Principle Sensory N. 4. Motor Nucleus of 5

1. Jaw Jerk reflex 2. Pain & temperature (similar to N.Proprius of STT) 3. Vibration, prorioception (similar to DCP - N. CUneatus & GRacilus) 4. Muscles of Mastication

Cranial nerves & nuclei Flashcards by M G

How many nerves are in the midbrain, pons and medulla? What are they?

2 in Midbrain - Cn 3 & 4
4 in pons - 5,6,7,8
4 in medulla - 9,10, 12 (11 technically in spinal cord)

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Where are motor nuclei arranged in the brainstem? Sensory nuclei?

Motor = midline

Sensory = lateral

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What functional component does CN 1 use? Which nucleus of origin? Where is it located?

olfactory Mucosa (not a nucleus)

SVA
smell!

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What type of memory is most prominent? Which part of the brain is responsible for this?

SMELL MEMORY

hippocampus

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What functional component does CN 2 use? Which nucleus of origin? Where is it located?

SSA
LATERAL GENICULATE (superior colliculus)
- retina

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Where does the optic nerve end up synapsing? Which area is this and in what fissure?

Synapses in the OCCIPITAL CORTEX

Area 17
Calcarene Fissure

(optic visual fields are opposite the physical location)

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Which fibers (nasal or temporal optic) cross?

NASAl fibers cross

optic fibers don’t

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What does the optic nerve communicate with in the midbrain?

SUPERIOR colliculus & lateral geniculate

attached to back of thalamus

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How do auditory fibers communicate to the brain

MEDIAL Geniculate via inferior colliculus

slo aim

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What functional component(s) does CN 3 use? Which nucleus(i) of origin? Where is it located in the rostral midbrain?

GVE & GSE
GVE = Edinger-Westphal
GSE = Oculomotor
Interpeduncular Fossa

(GVE = sphincter pupillae + accommodate the lens)

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Where is the EWN & Oculomotor Nucleus located in the midbrain?

in the middle under the PAG

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What is the MLF responsible for?

controlling movement, turning eyes etc

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What functional component(s) does CN 4 use? Which nucleus(i) of origin? Where is it located?

GSE (Superior Oblique)
Trochlear Nuclei
DORSAL side of the brain, fibers cross
CAUDAL midbrain

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Which nerve has the longest intracranial exposure?

CN 4

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What is a lower motor neuron? Upper?

synapses in the spinal chord after coming from the brain

- motor neurons in the cerebral cortex or brainstem and carry information TO the lower motor neurons

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What are signs of an upper motor neuron lesion? Lower?

Upper:

Exaggerated Reflexes
Spasticity
Hemiplegia
Babinski

Lower:

Hyporeflexivity
Fasciculations
FLACCID PARALYSIS

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What are corticobulbar fibers, upper or lower motor neurons?

UPPER

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What is considered the “tee” under the Inferior colliculus (golfball)? What is its function?

Lateral Lemniscus

HEARING

(TEST)

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What nerve sits on top of MLF? What is MLF for?

CN 4!

Coordinates eye movements and head & neck movements w/ vestibular & auditory systems

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What functional component(s) does CN 5 use? Which nucleus(i) of origin? Where is it located?

GSA & SVE
Mesencephalic
Spinal Nucleus of 5
Principle Sensory
SVE = Motor Nucleus of Nerve 5
PONS

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What are the following nuclei responsible for:

Mesencephalic
Spinal Nucleus of 5
Principle Sensory N.
Motor Nucleus of 5

Jaw Jerk reflex
Pain & temperature (similar to N.Proprius of STT)
Vibration, prorioception (similar to DCP - N. CUneatus & GRacilus)
Muscles of Mastication

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Wich nucleus of 5 has pseudo-unipolar cells?

Mesencephalic (& Trigeminal ganglion)

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What is the order of the nuclei of 5 in the pons?

Study These Flashcards

mesencephalic
Principle Sensory N.
Spinal N. of 5
Motor of 5 is NEXT to the principle sensory nucleus (more medial)

Which nucleus is used for GSA to the small ear pinna?

Study These Flashcards

Spinal Nucleus of 5

If there was a stroke in the brain & the spinal nucleus was affected, what would be damaged in the face & body?

1. IPSILATERAL damage to the face | 2. Contralateral damage to the lower body (STT)

Which pathways end up in VPM? VPL?

VPM = Trigeminal Thalamic pathway of 5!! VPL = DCP & STT

Which nucleus of 5 is like nucleus proprius? Like N. Cuneatus or Gracilus?

1. N. Proprius = Spinal Nucleus of 5 (pain & temp to the face) 2. Principle Sensory N of 5 (proprioception & vibration)

What nucleus of 5 is similar to the Dorsal Root Ganglion? What kind of cells are here? Which reflex does it elicit?

1. Mesencephalic 2. Pseudo-unipolar 3. JAW JERK (masseter muscle)

The Principle sensory nucleus of 5 does what?

Receives info about touch & jaw position

Where do the trigeminal proprioceptive fibers synapse, which is different from DCP & STT? Which area of the brain?

VPM (the others are VPL) - AREA 312 (sensory)

What are the following areas responsible for: 312 4 17

1. 312 = SENSORY 2. 4 = MOTOR (pre-central gyrus) 3. Area 17 = VISION (in calcarene fissure)

What nucleus innervates the muscles of mastication?

Trigeminal Motor nucleus of 5

What functional component(s) does CN 6 use? Which nucleus(i) of origin? Where is it located?

1. GSE (Lateral Rectus) 2. Abducents Nucleus 3. Pontomedullary Junction (pons)

Which nerve forms a GENU around CN 6?

CN 7

Which nerve makes up the Facial Colliculus?

CN 6!!

What functional component(s) does CN 7 use? Which nucleus(i) of origin? Where is it located?

1. GVA, SVA, GVE, GSA,SVE 2. a) GVA & SVA = Nucleus Solitarius GVE = Superior Salvitory GSA = Spinal Nucleus of 5 SVE = Motor Nucleus of 7 Pontomedullary ANGLE

Which is the upper and lower part of Nucleus Solitarius responsible for?

upper = taste | lower = visceral sensation

Which cranial nerves use Nucleus Ambiguous? Which functional component is this responsible for?

9,10 - SVE (5 & 7 use Motor Nucleus of 5 & 7)

Which nucleus does the muscles of facial expression? The submandibular/sublingual glands?

1. SVE --> Motor Nucleus of 7 | 2. Superior Salvitory Nucleus

Which nucleus is responsible for taste to the anterior 2/3 of the tongue?(SVA)

1. Nucleus Solitarius (upper)

What will happen with unilateral corticobulbar damage (upper motor neuron)?

Spare the upper face, since has BILATERAL corticobulbar input to the upper face - lower face on the opposite side will be affected

What is the difference in symptoms of a stroke in the left Corticobulbar region & a cut in the left CN of 7(Bells Palsy) ?

1. Stroke (supra nuclear region)= opposite lower side of face will be affected - RIGHT 2. TOTAL left face function will be wiped out- Flaccid Paralysis

Which of the two is up motor neurons and which are lower motor neurons: 1. Corticobulbar Cells 2. Facial motor Nucleus

1. Corticobulbar = UPPER (opposite side of lower face since BILATERAL representation) 2. Facial Motor Nucleus = lower (wipe out same side of face)

What functional component(s) does CN 8 use? Which nucleus(i) of origin? Where is it located?

1. SSA 2. Cochlear & Vestibular (cochlear = saddle bags) cochlear = organ of court vestibular = Semicircular Canals 3. MEDULLA--> pontomedullary angle*

Hearing is bilateral. True or false.

TRUE - it is bilateral and hard to knock out

Where are the vestibular and cochlear nuclei of 8 found in the pons? Which has a peppered look? Which is the saddle bag of ICP?

LATERAL SIDE - pontomedullary angle 2. Vestibular Nucleus = Peppered (more medial) Cochlear = saddle bags of ICP

What functional component(s) does CN 9 use? Which nucleus(i) of origin? Where is it located?

1. GVA, SVA, GVE, GSA, SVE 2. GVA= lower Nuc. Solitarius SVA = upper Nuc. Solitarius GVE = Inferior Salvitory Nucleus GSA = Spinal Nuc. of 5 SVE = Nuc. Ambiguus

What are the following nuclei of 9 used for: 1. Nucleus Solitarius 2. Inferior Salvitory 3. Spinal Nuc. of 5 4. Nuc. Ambiguus

1. Nuc. Solitarius - upper = taste - lower = carotid sinus 2. Inferior Salvitory = PAROTID 3. Spinal Nuc of 5 = sensation to ear pinna 4. Nuc.Ambiguus = STYLOPHARYNGEUS

What functional component(s) does CN 10 use? Which nucleus(i) of origin? Where is it located?

1. GVA, SVA, GVE, GSA, SVE ``` 2. GVA= lower Nuc. Solitarius SVA = upper Nuc. Solitarius GVE =DMX (Dorsal Motor) GSA = Spinal Nuc. of 5 SVE = Nuc. Ambiguus ``` DORSAL TO OLIVE

What nucleus does 10 use to slow heart and speed digestion? WHERE IS IT LOCATED

GVE - DORSAL MOTOR NUCLEUS of 10 - located at the top portion of the ROSTRAL medulla

How are nuclei arranged?

In columns according to functional components

What functional component(s) does CN 11 use? Which nucleus(i) of origin? Where is it located?

1. SVE 2. Accessory Nucleus 3. In spinal cord C1-C5

Which is the only nucleus in the spinal cord?

CN 11 - in the ventral horn

What functional component(s) does CN 12 use? Which nucleus(i) of origin? Where is it located?

1. GSE 2. Hypoglossal Nucleus 3. Ventral to the Olive (more medial than 10 in the cross section of medulla)

A lesion in CN 12 results in the tongue deviating to or away the lesion?

TO THE LESION - lick your wounds

What separates the Alar and Basal sections?

Sulcus Limitans

Cranial nerves & nuclei Flashcards

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