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Flashcards in Cranial Nerves Deck (39)
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1

CN:I

Sensory/Motor?

 

Olfactory Nerve

Sensory-smell

2

CN:II

Sensory/Motor?

Optic Nerve

Sensory-vision

3

CN:III

Sensory/Motor?

Oculomotor Nerve

Motor

levator palpebrae superioris

superior rectus

medial rectus

inferior rectus

inferior oblique

ciliary muscle

sphincter pipillae

 

4

CN:IV

Sensory/Motor?

Trochlear Nerve

Motor

Superior oblique

5

CN:V

Sensory/Motor?

Trigeminal Nerve

Motor- muscles of mastication

Sensory- face, nasal cavity, oral cavity and teeth

 

6

CN:VI

Sensory/Motor?

Abducent Nerve

Motor

lateral rectus

7

CN:VII

Sensory/Motor?

Facial Nerve

MOTOR and PROPRIOCEPTIVE to muscles of facial expression (inc. platysma, occipital belly of occipitofrontalis), auricularis, posterior belly of digastric, stylohyoid and stapedius. 

SPECIAL SENSORY (taste) to anterior 2/3 tongue. 

SECRETOMOTOR (parasympathetic) to lacrimal, submandibular and sublingual glands. 

8

CN:VIII

Sensory/Motor?

Vestibulocochlear Nerve

Special sensory (special somatic afferent): hearing/equilibrium/balance/motion. 

9

CN:IX

Sensory/Motor?

Glossopharangeal Nerve

Motor- stylopharyngeus, secretomotor to parotid gland

Sensory - pharynx, middle ear, carotid sinus, taste of posterior 1/3 of tongue

10

CN:X

Sensory/Motor?

Vagus Nerve

Motor - pharynx, larynx, bronchal tree, heart, GI tract to splenic flexure, secretomotor to mucus glands

Sensory - soft palate, pharynx, larynx, carotid body, bronchal tree, GI tract (gag reflex)

11

CN:XI

Sensory/Motor?

Accessory Nerve

Somatic Motor

trapezius

sternocleidomastoid

 

[Pain and proprioceptive fibres to these muscles via cervical plexus (C2-C4).]

12

CN:XII

Sensory/Motor?

Hypoglossal

motor - muscles of tongue

13

Where does the Olfactory Nerve CN:I originate and terminate?

• Cell bodies in nasal mucosa. 

  • enter cranial cavity via cribiform plate

• Olfactory nerve fibres synapse with mitral cells in olfactory bulb. 

• Post-synaptic axons form the olfactory tract.  

• Terminate in piriform cortex of temporal lobe. 

14

Where does the Optic Nerve CN:II originate and terminate?

• Cell bodies in retina. 

• Optic canal. 

• Optic chiasm. 

• Optic tract. 

• Terminate in lateral geniculate bodies of thalamus. 

• Post-synaptic axons to visual cortex in occipital lobe. 

15

Where does the Oculomotor Nerve CN:III originate and terminate?

•Two nuclei in midbrain (level sup.colliculus) 

•Exit via superior orbital fissure. 

16

What are the actions of the somatic motor and visceral motor fibers of the Oculomotor nerve?

Somatic MOTOR (general somatic efferent) & proprioceptive to: 

  • 4/6 extraocular muscles (superior, medial and inferior recti; inferior oblique) 
  • Superior eyelid (levator palpebrae superioris) 

Visceral motor (general visceral efferent – parasympathetic). 

  • Post-synaptic fibres from ciliary ganglion to ciliary muscle and sphincter pupillae muscle. 

17

Which nerve is....

  • Smallest cranial nerve?
  • Only nerve to originate on dorsal aspect of brainstem?

 

Trochlear Nerve

18

Where does the Trochlear Nerve CN:IV originate and terminate?

  • nucleus in the midbrain on the medial aspect of the inferior colliculus

  • exits via superior orbital fissure

  • Somatic MOTOR (general somatic efferent) and proprioceptive to superior oblique. 

     

19

what is the largest cranial nerve with 3 divisions?

Trigeminal Nerve

20

Where does the Trigeminal Nerve CN:V originate?

  • Four trigeminal nuclei in pons – one motor and three sensory.

21

Name CN:V1

what is the cranial exit

sensory/motor?

name some nerve branches

cutaneous distribution

  • Opthalmic nerve
  • superior orbital fissure
  • sensory only
    • frontal >>supraorbital>>supratrochlear, lateral/medial branch
    • Lacrimal >>lacrimal gland
    • nasocilliary>>posterior ethmoidal, anterior ethmoidal, infratrochlear, long ciliary, ciliary ganglion
  • anterior 2/3 of cranium excluding temporal bone, then rostral up to eye lids including nasal bridge and tip of nose

22

Name CN:V2

what is the cranial exit

sensory/motor?

name some nerve branches

cutaneous distribution

  • Maxillary nerve
  • foramen rotundum
  • sensory only
    • zygomatic nerve^communicating branch lacrimal, + zygomaticotemporal, zygomaticofacial
    • infraorbital^superior alveolar branches^ ganglionic branches>>pterygopalatine ganglion 
  • anterior zugomatic bone, under eyes, nostrils and upper lip

23

Name CN:V3

what is the cranial exit

sensory/motor?

name some nerve branches

cutaneous distribution

  • Mandibular nerve
  • foramen ovale
  • sensory and motor-muscles of mastication (masseter, temporalis, lat/med pterygoid), mylohyoid, anterior belly of digastric,Tensor veli palatini,tensor tympani. 
    • auriculotemporal
    • buccal
    • lingual^submandibular ganglion
    • inferior alveolar^mylohyoid+inferior dental plexus >>mental
  • part of temporal bone, anterior 1/2 of ear, mandible, lower lip

24

What are the branches that cary parasympathetic innervation in CN:V1?

presynaptic parasympathetic axons from facial nerve via>>greater petrosal>>nerve of pterygoid canal>>pterygopalatine ganglion>>Zygomatic branch of maxillary division>>comunicating branch>>lacrimal nerve>>lacrimal gland

25

What are the branches that carry parasympathetic innervation from CN:V2?

presynaptic parasympathetic axons from facial nerve>>pterygopalatine ganglion>>pterygopalitine nerves>>Zygomatic branch of maxillary division>>comunicating branch>>lacrimal nerve>>lacrimal gland

26

What are the branches that carry parasympathetic innervation from CN:V3?

  1. Glossopharangeal>>tympanic nerve>>tympanic plexus>>presynaptic parasympathetic axons from lesser petrosal nerve>>mandibular division CNV3>>synapse otic ganglion>> auricotemporal nerve>>parotid gland
  2. facial nerve >>chorda tympani>>presynaptic parasympathetic axons from lingual nerve>> synapse submandibular ganglion>>submandibular gland + sublingual gland

 

 

27

Where does the Abducent Nerve CN:VI originate and terminate?

  • abducent nucleus in pons
  • exits via superior orbital fissure
  • Supplies somatic MOTOR and proprioceptive fibres to LATERAL RECTUS muscles (abducts the eyes) 

28

Where does the facial nerve CN:VI originate and exit from the cranial cavity?

Motor nucleus in pons

internal accoustic meatus

29

Name the 6 branches of the Facial nerve CN:VII

  1. posterior auricular
  2. temporal
  3. zygomatic
  4. buccal
  5. marginal mandibular
  6. cervical

30

what is the difference in innervation between Chordata tympani and lingual nerve?

  • Chorda tympani =>  special sensory (taste) to anterior 2/3 tongue 

  • Lingual nerve (from CN V3) => general sensation (touch/temp) to anterior 2/3 tongue