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a_anatomy > Lecture 22 - Skull and Cranial Nerves II > Flashcards

Lecture 22 - Skull and Cranial Nerves II Flashcards

1
Q

What is CN I?

A

Olfactory n.

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2
Q

What information does CN I carry?

A

Olfactory information back to piriform

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3
Q

What are the three parts of the olfactory n.?

A

Olfactory filaments - bulb - tract

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4
Q

Where do CN I nerves enter?

A

Anterior cranial fossa via cribriform plate

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5
Q

What are vomeronasal ducts?

A

Associated with the flehmen reaction, pheromone detection

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6
Q

What is CN II?

A

Optic nerve

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7
Q

What are the three parts to the optic nerve?

A

Optic nerve - chiasm - tract

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8
Q

What infomation does CN II carry?

A

Information from the retinal ganglion cells to the lateral geniculate nucleus of the thalamus

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9
Q

What is contained within the optic nerve?

A

Fibers from one eye

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10
Q

What is contained within the optic chiasm?

A

Fibers from nasal retina of each eye

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11
Q

What is contained within the optic tract?

A

Ipsilateral temporal retinal fibers and contralateral nasal retina fibers

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12
Q

What is CN III?

A

Oculomotor n.

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13
Q

What information is carried within CN III?

A

Provides motor innervation to several extrinsic muscles that move the eye
Parasympathetic innervation to two intrinsic muscles of the eye

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14
Q

What are the actual muscles in the eye that the oculomotor neuron innervates?

A

Ventral oblique
Ventral, medial, dorsal recti
Levator palpebrae superioris

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15
Q

What are the actual muscles in the eye that CN III provides PNS innervation?

A

Ciliary muscles

Pupillary sphincter

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16
Q

What do the PNS do to the eye?

A

Cause the lens to become rounder and the pupil diameter to decrease

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17
Q

What is CN IV?

A

Trochlear

18
Q

What does the CN IV do?

A

Provide motor innervation to dorsal oblique muscle

19
Q

What is CN V?

A

Trigeminal

20
Q

What are the branches of CN V?

A

1 - opthalmic
2 - maxillary
3 - mandibular

21
Q

What is the function of CN V?

A

Provide sensory innervation to the face

22
Q

What does the CN V3 do specifically?

A

Motor innervation to the muscles of mastication and muscles in the ear, pharynx with tensor in the name

23
Q

What do the CN V branches exit from?

A

Trigeminal ganglion

24
Q

What is CN VI?

A

Abducent

25
Q

What is the function of CN VI?

A

Provide motor innervation to lateral rectus and retractor bulbi of the eye

26
Q

What is CN VII?

A

Facial n.

27
Q

What is the SNS function of CN VII?

A

Motor innervation to muscles of facial expression

Taste to anterior 2/3 of the tongue

28
Q

What provides general sensory to the anterior 2/3 of the tongue?

A

CN V3

29
Q

What is the PNS function of CN VII?

A

Innervation to pterygopalatine ganglion
Nasal mucosa - mucus production
Lacrimal gland - tear production

30
Q

What is CN VIII?

A

Vestibulocochlear n.

31
Q

What is the function of CN VIII?

A

Vestibular apparatus - balance

Cochlea - hearing

32
Q

Where does CN VIII enter?

A

Temporal bone with facial nerve at the internal acoustic meatus

33
Q

What is CN IX?

A

Glossopharyngeal

34
Q

What is the function of CN IX?

A

Motor innervation to stylopharyngeus
Parotid gland
Taste to posterior 1/3 of tongue
Sensation to post. 1/3 of tongue, oropharynx, middle ear, auditory tube, carotid sinus, and carotid body

35
Q

What is CN X?

A

Vagus n.

36
Q

What SNS functions does CN X have?

A

Motor to muscles of soft palate (except tensor veli palatini), palatoglossus, pharynx, and larynx

37
Q

What PNS functions does CN X have?

A

Cardiac muscle, viscera to left colic fissure

Taste buds around epiglottis, external acoustic meatus, dura mater in dorsal cranial fossa

38
Q

What is CN XI?

A

Accessory n.

39
Q

What muscles does CN XI innervate?

A

Brachiocephalicus, omotransversarius, sternocephalicus, and trapezius

40
Q

What is CN XII?

A

Hypoglossal n.

41
Q

What is the function of CN XII?

A

Motor innervation to almost all of the intrinsic and extrinsic tongue muscles

a_anatomy (43 decks)

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