Cranial Nerves -- BDS Flashcards Preview

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Flashcards in Cranial Nerves -- BDS Deck (12):
1

CN I

olfactory nerve (smell)

sensory; special viceral afferent (SVA)

Only CN without thalamic relay to cortex!

Directly relay to piriform cortex

2

CN II

Optic

  • function = sight
  • special somatic (voluntary) afferent (SSA)
  • Lateral geniculate nucleus and pretectal nucleus (pupillary light reflex)

3

CN III

Oculomotor 

  • Motor (general somatic efferent (GSE) and general visceral efferent-parasympathetic (GVE))
  • function = eye movement (LR6SO4)R3 pupillary constriction (sphincter pupilae (EWN), muscarinic receptors), accomodation, eyelid opening (levator palprebrae)
  • Nuclei: oculomotor nerve nucleus (superior collicullus of midbrain) + accessory Edinger-Westphal nucleus

 

4

CN IV 

Trochlear

motor: general somatic efferent 

one extraocular muscle-- suberior oblique

nucleus: nucleus of the trochlear nerve in midbrain, immediately caudal to the oculomotor nucleus (superior colliculous)

5

CN V

Trigeminal

  • General somatic sensory and branchial somatic motor
  • Both sensory and motor
  • 4 nuclei: one motor (motor nucleus of trigeminal nerve) and three sensory (mesencaphalic, prinicipal sensory and spinal nuclei of trigeminal nerve)
  • Function: mastication, facial sensation (ophthalmic, maxillary, mandibular), somatosensation from anterior 2/3 of tongue. 

6

CN VI

Abducens

  • general somatic efferent (GSE)
  • Function: eye movement to one muscle (lateral rectus)
  • Nucleus: abducent nucleus in the pons near the median plane

 

7

CN VII

Facial

  • both sensory and motor
  • special sensory (taste), general somatic sensory, branchial somatic motor and parasympathetic visceral motor
  • facial movement, taste from anterior 2/3 of tongue, lacrmation, slaivation (submandibular and sublingual glands), eyelid closing (obicularis oculi), stapedius muscle in ear (note that nerve courses through parotid gland, but does not innervate it. 

8

CN VIII

Vestibulocochlear

  • both sensory and motor
  • special somatic afferent (special sensation of hearing, equilibrium, and motion (accelaration/deceleration)
  • function: hearing and balance
  • nucleus: vestibular nuclei (junction of pons and medulla), cochlear nuclei (medulla)

 

 

9

CN IX

glossopharyngeal

  • both sensory and motor
  • general somatic sensory, special sensory (taste), visceral sensory, branchial somatic motor, and parasympathetic visceral motor
  • 4 nuclei: Motor = nucleus ambiguus and inferior salivary nucleus; Sensory = snsory nuclei of the trigeminal nerve and nuclei of the solitary tract.
  • function: taste and somatosensation from posterior 1/3 of tongue, swallowing, salivation (parotid gland), monitoring carotid body and sinus chemo- and baroreceptors, and stylopharyngeus (elevates pharynx, larynx). 

 

10

CN X

Vagus 

  • both motor and sensory
  • general somatic sensory (GSS), special sensory (taste) (SST), visceral sensory, brachial somatic motor (BSM), parasympathetic visceral motor (PVM)
  • Function: taste from epiglottic region, swallowing, soft palate elevation, midline uvula, talking, coughing, thoracoabdominal viscera, monitoring aortic arch chemo- and baroreceptors

11

CN XI

accessory 

  • both sensory and motor
  • gerneral somatic sensory (GSS), special sensory (taste) (SST), visceral sensory, brachial somatic motor (BSM), parasympathetic visceral motor (PVM)
  • function: head turning, shoulder shrugging (SCM, trapezius)
  • Nucleus: sensory nucleus of the trigeminal nerve and nuclei of the solitary tract (taste and viceral sensory), and dorsal vagal nucleus (PVM)

12

CN XII