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B12 - MSK and CNS > Cranial Nerves > Flashcards

Cranial Nerves Flashcards

1
Q

CN I

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Olfactory

  1. Cerebrum
  2. Cribriform plate
  3. sensory (SVS)
  4. Smell
  5. Ask if they have had any trouble with their sense of smell. Use coffee or peppermint and see if they can smell it
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2
Q

CN II

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Optic

  1. Cerebrum
  2. Optic canal
  3. sensory (SSS)
  4. vision
  5. Visual acuity (Snellen chart), visual fields, fundoscopy, accommodation, pupil reactions (CNII and III)
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3
Q

CN III

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Oculomotor

  1. Brain stem (midbrain-pontine junction)
  2. Superior orbital fissure
  3. motor (GSM and GVM)
  4. 4 extrinsic eye muscles and levator palpebrae superioris, pupillary sphincter
  5. pupil reactions, eye movements
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4
Q

CN IV

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Trochlear

  1. Posterior side of midbrain
  2. superior orbital fissure
  3. motor (GSM)
  4. Superior oblique eye muscle
  5. eye movements
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5
Q

CN V

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Trigeminal
V1 = opthalmic n
V2 = maxillary
V3 = Mandibular
1. Pons
2. V1 - superior orbital fissure, V2 - Forament rotundum, V3 - Foramen ovale
3. sensory and motor
4. V1 - scalp, forehead and nose (sensory), V2 - cheeks, lower eye lid, nasal mucosa, upper lip, upper teeth and palate, V3 - sensation from anterior 2/3 tongue, skin over mandible and lower teeth, motor of muscles of mastication
5. motor - ask patient to open mouth then clench teeth. repeat mouth opening against resistance. feel over masseter and temporalis when they clench their teeth.
sensory - test sensation (cotton wool then neurotip) in forehead, medial aspect of cheek and chin on both sides of face.
corneal reflex

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6
Q

CN VI

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Abducens

  1. Pontine-medulla junction
  2. superior orbital fissure
  3. motor
  4. Lateral rectus
  5. Eye movements
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7
Q

CN VII

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Facial

  1. Pontine-medulla junction
  2. Internal acoustic meatus
  3. Sensory and Motor
  4. sensation to external part of ear, taste from anterior 2/3 tongue, hard and soft palate. Muscles of facial expression. Lacrimal, submandibular, sublingual glands and mucous glands of mouth and nose
  5. ask patient to frown, screw up eyes (repeat against resistance), puff out cheeks and show teeth
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8
Q

CN VIII

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A 
Vestibulocochlear
1. Pontine-medulla junction
2. internal acoustic meatus
3. sensory
4 hearing and balance
5. Rinne's test, Weber's test
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9
Q

CN IX

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Glossopharyngeal
1. Medulla oblongata, posterior to the olive
2. Jugular foramen
3. Both
4. sensation of posterior 1/3 tongue, ext. ear, and middle ear cavity, carotid body adn sinus. taste from post. 1/3 tongue.
motor of parotid gland and stylopharyngeus
5. Gag reflex

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10
Q

CN X

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Vagus
1. Medulla oblongata (posterior to olive)
2. Jugular foragmen
3. Both
4. Sensation of external ear, laynx, pharynx, thoracic and abdominal viscera. taste from epiglottis region of tongue.
smooth muscles of pharynx, larync and most of GIT. most muscles of pharynx and larynx
5. Gag reflex

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11
Q

CN XI

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Accessory

  1. Medulla oblongata (posterior to olive)
  2. jugular foramen
  3. motor
  4. trapezius, sternocleidomastoid, a few fibres run with CN X to viscera
  5. Ask patient to shrug shoulders, turn chin to left and right. Repeat against resisitance
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12
Q

CN XII

  1. Origin
  2. Foramen that it passes through in skull.
  3. Modality (sensory or motor)
  4. Function
  5. Clinical test(s)
A

Hypoglossal
1. Medulla oblongata (anterior to olive)
2. hypoglossal canal
3. motor
4. intrinsic and extrinsic tongue muscles (except palatoglossus)
5. ask patient to open mouth - look for wasting/fasciculation in mouth.
stick tongue out and look for deviation from midline

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B12 - MSK and CNS (4 decks)

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