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Midterm anatomy exci 254 > Lecture 8 - Cranial nerves > Flashcards

Lecture 8 - Cranial nerves Flashcards

1
Q

C I name + function

A

Olfactory nerve

Function: special sensory (or visceral afferent - smell)

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2
Q

C II name + function

A

Optic nerve

Function: special sensory (somatic afferent - vision)

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3
Q

Content of left optic tract

A

Medial fibers from right eye
+
Lateral fibers from left eye

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4
Q

Content of right optic tract

A

Medial fibers from left eye
+
Lateral fibers from right eye

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5
Q

In the optic nerve, ____ fibers cross-over but ____ stay on the same side

A

medial, lateral

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6
Q

C III name + function

A

Occulomotor (“eye mover”)

Function: mainly motor

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7
Q

C III - occulomotor innervates what? (5)

A 
Superior, inferior and medial rectus muscles
Inferior oblique muscle
Levator palpabrae muscle
Ciliary bodies (muscles) of the lens
Iris
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8
Q

Where the nerve (CIII) divides into the superior and inferior divisions

A

Within the superior orbital fissure

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9
Q

C IV name + function + origin

A

Trochlear nerve
Function: mainly motor
Originates from the superiolateral aspect of the pons

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10
Q

T or F: The trochlear nerve passes through the inferior orbital fissure

A

FALSE, superior orbital fissure

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11
Q

Injury to CIV effect

A

Inhibits the eyeball from turning out and down (inferolaterally)
= Diplopoa

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12
Q

Only cranial nerve to emerge dorsally from the brainstem

A

CN IV - trochlear

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13
Q

C V name + function + location

A

Trigeminal nerve
Function: will be discussed for each division of CN V
Location: at the side of the pons

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14
Q

Largest cranial nerve

A

CV - trigeminal

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15
Q

The first two divisions of CN V are ____

A

purely sensory

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16
Q

Name the 3 divisions of the CN V

A 
Ophthalmic division (C V1)
Maxillary division (C V2)
Mandibular division (C V3)
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17
Q

Ophthalmic (C V1) supplies ? (9)

A

Eyeball, conjunctiva, lacrimal sac and gland, nasal mucosa, frontal sinus, external nose, upper eyelid, forehead and scalp

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18
Q

C V1 passes where

A

Through the superior orbital fissure

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19
Q

C V2 passes where

A

Through the foramen rotundum

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20
Q

Maxillary division (C V2) relays sensation from?

A

From the skin of the face over the maxilla including the upper lip, maxillary teeth, nasal mucosa, maxillary sinuses and palate

21
Q

The third division of the CN V is both a ____ and ____ nerve

A

Motor, sensory

22
Q

C V3 passes where

A

Through the foramen ovale

23
Q

Motor component of the CN V3

A

Muscles of mastication (Masseter, temporalis, medial & lateral pterygoid)

24
Q

Sensory component of the CN V3

A

Skin over the mandible, lower lip and side of head, mandibular teeth, mucosa of the mouth and the posterior two thirds of the tongue

25
Q

CN VI name + function + innervation

A

Abducens nerve
Function: mainly motor
Innervates the lateral rectus muscle

26
Q

CN VI passes where

A

Through the superior orbital fissure

27
Q

CN VII name + function

A

Facial nerve

Function: mixed, primarily a motor nerve, but also carries special sensory fibers (taste)

28
Q

CN VII passes where

A

Emerges between the pons and medulla on the brain
Exits the skull through the internal acoustic meatus, facial canal, and STYLOMASTOID FORAMEN
Passes through the parotid gland

29
Q

Facial nerves supplies (7 groups)

A

Muscles of facial expression
Taste to anterior two thirds of the tongue
Parasympathetic innervation to the submandibular, sublingual and lacrimal glands and mucous glands of the soft palate, nose and paranasal sinuses

30
Q

CN VIII name + function + location

A

Vestibulocochlear nerve
Function: mixed (mainly sensory)
Located in the petrous portion of the temporal bone at the internal acoustic meatus

31
Q

Nerve that DOES NOT exit the skull

A

Vestibulocochlear - CN VII

32
Q

2 divisions of CN VIII

A
  1. Vestibular (equilibrium)

2. Cochlear (hearing)

33
Q

CN IX name + function

A

Glossopharyngeal nerve

Function: mixed

34
Q

Responsibility of CN IX

A

Conveying taste from the posterior one third of the tongue

35
Q

CN IX supplies (7 things)

A

Sensory innervation to the pharyngeal mucosa, palatine tonsil, posterior one third of tongue, eustachian tube, middle ear, carotid sinus and carotid body

36
Q

Only muscle innervated by CN IX

A

Stylopharygeus muscle

37
Q

CN IX passes where

A

Through the jugular foramen to exit the skull

38
Q

CN X name + function

A

Vagus nerve

Function: mixed

39
Q

Responsibility of vagus nerve

A

Sensation from the inferior pharynx, larynx and thoracic & abdominal viscera

40
Q

CN X innervates what

A

Muscles of the soft palate, pharynx, intrinsic laryngeal muscles and palatoglossus muscles of the tongue

41
Q

Why is the vagus nerve called “the wanderer”

A

Due to its extensive innervation throughout the body

42
Q

CN X exits where

A

Exits the skull at the medulla oblongata with CN IX at the jugular foramen

43
Q

CN XI name + function + origin

A

Accessory nerve
Function: mainly motor
Originates from the medulla oblongata and spinal cord

44
Q

Responsibility of CN XI (innervation)

A

Motor innervation of the sternocleidomastoid and trapezius muscles

45
Q

CN XI exits where

A

Jugular foramen

46
Q

CN XII name + function + origin

A

Hypoglossal nerve
Function: mainly motor
Originates from the medulla oblongata

47
Q

CN XII exits where

A

Through the hypoglossal canal

48
Q

CN XII supplies

A

All of the muscles of the tongue except palatoglossus (supplied by CN X)

49
Q

What is the helpful mnemonic to remember the function of the cranial nerves

A

Some Say Marry Money But My Brother Says Big Brains Matter More

Midterm anatomy exci 254 (8 decks)

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