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Flashcards in Cranial Nerves Deck (54)
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1

How many pairs of cranial nerves are there?

12

2

What is the name of the first cranial nerve?

Olfactory

3

What is the pathway of the olfactory nerve?

Passes through the cribriform plate and enters the olfactory bulb in the anterior cranial fossa

4

What is the role of the olfactory nerve?

Special sensory (smell)

5

What is the consequence of a fractured cribriform plate?

Olfactory nerve tear causing anosmia

6

What is the name of the second cranial nerve?

Optic

7

What is the pathway of the optic nerve?

Enters via optic canal to join optic chiasma

8

What is the role of the optic nerve?

Special sensory (vision)

9

What are the clinical application of the optic nerve?

Increase CSF pressure causes papilloedema
Right optic nerve section causes right eye blindness
Optic chiasma section causes peripheral vision loss
Right optic tract section causes left temporal and right nasal field blindness

10

What is the name of the third cranial nerve?

Oculomotor

11

What is the pathway of the oculomotor nerve?

Emerges from midbrain
Exits via superior orbital fissure

12

What is the role of the oculomotor nerve?

Somatic motor control of extra ocular muscles and eyelid
Parasympathetic control of pupil constriction and ciliary muscle causing lens accommodation

13

What are the clinical signs of an oculomotor nerve problem?

Ptosis
No pupillary reflex
No lens accommodation
Eyeball abducted and pointing down

14

What is the name of the fourth cranial nerve?

Trochlear

15

What is the pathway of the trochlear nerve?

Emerges from dorsal surface of midbrain
Exits via superior orbital fissure

16

What is the role of the trochlear nerve?

Somatic motor control of superior oblique

17

What are the clinical signs of trochlear nerve problems?

Diplopia

18

What is the name of the fifth cranial nerve?

Trigeminal

19

What are the 3 branches of the trigeminal nerve?

Ophthalmic (V1)
Maxillary (V2)
Mandible (V3)

20

What is the pathway of the ophthalmic nerve?

Emerges from pons, travels through trigeminal ganglion
Exits via superior orbital fissure

21

What is the role of the ophthalmic nerve?

Sensory into from cornea, forehead, scalp, eyelids, nose, mucosa from nasal cavity and sinuses

22

What is the pathway of the maxillary nerve?

Emerges from the pons, travels through the trigeminal ganglion
Exits via the foramen rotundum

23

What is the role of the maxillary nerve?

Sensory info from the maxilla, teeth, TMJ, nose mucosa, maxillary sinuses and palate

24

What is the pathway of the mandibular nerve?

Emerges from the pons, travels through the trigeminal ganglion
Exits via the foramen ovale

25

What is the role of the mandibular nerve?

Sensory info from mandible, teeth, TMJ, mouth mucosa, anterior 2/3rds tongue
Somatic motor control of mastication muscles, part of digastric, tensor veli, palatine and tensor tympani

26

What are the clinical signs of a trigeminal nerve problem?

Paralysis of mastication muscles
Loss of control of sneezing reflex
Loss of sensation in the face
Trigeminal neuralgia

27

What is the name of the sixth cranial nerve?

Abducent

28

What is the pathway of the abducent nerve?

Emerges between pons and medulla
Exits via superior orbital fissure

29

What is the role of the abducent nerve?

Somatic motor control of the lateral rectus

30

What is the clinical sign of a abducent nerve problem?

Medial deviation of the affected eye causing diplopia