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Block 3 Anatomy > Cranial Nerves > Flashcards

Cranial Nerves Flashcards

1
Q

CN I

A

olfactory nerve SVA for sense of smell

special visceral afferent

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2
Q

CN I pathway

A

leaves nasal cavity (nerve) > enters vault thru cribiform plate (bulb) > limbic lobe of cerebral cortex (tract)

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3
Q

CN II

A

optic nerve SSA

ability to see

special somatic afferent

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4
Q

CN II pathway

A
  1. receptors (rods and cones)
  2. leave eye from retina
  3. form optic nerve
  4. enter anterior cranial fossa thru optic canal
  5. specific retinal fibers cross at chiasm
  6. tract leads fibers to thalamus
  7. radiations lead to cortex around calcarine fissue @ occipital lobe
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5
Q

CN III

A

oculomotor nerve - GSE and GVE

ability to move and blink eyes
pupil constriction

general somatic/visceral efferent

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6
Q

CN III pathway

A

midbrain interpeduncular foss > SOF > orbit

synapses at ciliary ganglion (pre)

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7
Q

CN III GVE innervates

A

parasymps to ciliary ganglion, ciliary muscle, sphincter pupillae

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8
Q

CN III GSE muscles

A

motor to extraoculaur muscles (skeletal)
-levator palpebrae superioris, superior rectus, inferior rectus, medial rectus, inferior oblique

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9
Q

CN IV

A

trochlear nerve GSE

ability to move eyes up/down/back/forth via superior oblique muscle

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10
Q

CN IV pathway

A

from midbrain posteriorly inferior to colliculi > leaves middle fossa thru SOF

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11
Q

CN V

A

trigeminal nerve GSA and SVE

sensations in face and cheeks, taste
jaw movement

general somatic afferent, special visceral efferent

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12
Q

CN V GSA

A

sensory to face, orbit, nasal, oral cavity
trigeminal ganglion

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13
Q

CN V SVE

A

motor to muscles of mastication- mylohyoid, ant belly digastric, tensory tympani, tensor veli palatini

mandibular branch (v3) only one that does motor, v1 and v2 sensory only

pharyngeal arch

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14
Q

CN VI

A

abducens nerve GSE

ability to move eyes via lateral rectus muscle ‘abducts the eye’

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15
Q

CN VI pathway

A

near midline at pontmedullary junction > middle fossa thru SOF
-nucleus is in pons

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16
Q

CN VII

A

facial nerve

facial expressions
sense of taste

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17
Q

CN VII SVE

A

motor to muscles facial expression
-stylohyoid
post belly digastric
stapedius in ear

18
Q

CN VII GVE

A

parasymp motor
-synapses @ pterygopalatine (deep face) and submandibular ganglia

-lacrimal, nasal, palatine glands
-submandiublar and sublingual glands

19
Q

CN VII GSA

A

sensory to external auditory meatus (ear canal)

20
Q

CN VII GVA

A

pressure and chemistry from nasal cavity, soft palate, adj pharyngeal wall

21
Q

CN VII SVA

A

taste to anterior 2/3 tongue

22
Q

CN VII pathway

A
  1. pons at lateral pontomedullary junction
  2. internal auditory meatus
  3. facial canal
  4. stylomastoid foramen
  5. branches to glands and muscles
23
Q

CN VIII

A

cochlear/vestibular nerve SSA

sense hearing and balance

24
Q

CN VIII pathway

A

from pons > enters internal auditory meatus to internal ear (petrous portion)

25
Q

CN IX

A

glossopharyngeal nerve

ability to taste and swallow

26
Q

CN IX SVE

A

motor to pharyngeal constrictors and stylopharyngeus

pharyngeal arch 3

27
Q

CN IX GVE

A

parasymp motor to parotid gland
-synapses at otic ganglion

28
Q

CN IX GSA

A

general sense to post 1/3 of tongue

29
Q

CN IX SVA

A

taste to posterior 1/3 tongue

30
Q

CN IX GVA

A

carotid sinus
-special pathway: leaves medulla posterior to olive > enters jugular foramen to leave post fossa

31
Q

CN X

A

vagus nerve

digestion and heart rate

32
Q

CN X SVE

A

motor to muscles of larynx
pharyngela arch 4

33
Q

CN X GVE

A

parasymp to thoracic and abdom viscera thru left colic flexure of large intestine
-synapse at gangllia within walls of organ

34
Q

CN X GSA

A

sensory to external auditory meatus

35
Q

CN X GVA

A

aorta and gut baro/chemoreceptors

36
Q

CN X SVA

A

taste to epiglottic region

37
Q

CN X pathway

A

medulla behind olive > leave thru jug foramen

38
Q

CN XI

A

accessory nerve GSE

shoulder and neck muscle movement via motor to SCM and trap

39
Q

CN XI pathway

A

upper cervical spinal cord > ascends thru foramen magnum > joins IX and X thru jugular foramen

40
Q

CN XII

A

hypoglossal nerve GSE

ability to move your tongue via all intrinsic and extrinsic muscles of tongue

41
Q

CN XII pathway

A

medulla anterior to olive > leaves thru hypoglossal canal

Block 3 Anatomy (22 decks)

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