Trigeminal Nerve Flashcards Preview

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Flashcards in Trigeminal Nerve Deck (37)
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1

What are the 3 divisions of the trigeminal nerve

Opthalmic nerve - Va
Maxillary nerve - Vb
Mandibular nerve - Vc

2

What are the exit points of each division of the trigeminal nerve

Va - supra-orbital notch (foramen)
Vb - intra-orbital foramen
VF - Mental foramen

3

What bones compose the hard palate

Maxilla
Palatine

4

Where does the trigeminal pass through the soft palate

Incisive foramen
Greater palatine foramen (paired)
Lesser palatine foramen (paired)

5

What are the processes of the mandible

Coronoid process
Condylar process

6

Where does the trigeminal nerve emerge from the brain

The pons

7

How many roots does the trigeminal nerve have

2 - sensory and motor

8

Describe the information coming from the motor nucleus of the trigeminal and where does it go

Special visceral efferent information to the muscles of mastication

9

Describe the information going to the sensory nuclei of the trigeminal nerve

General somatic afferent

10

What are the different sensory nuclei of the trigeminal nerve and where in the brainstem are they found

Mesencephalic nucleus in the midbrain
Chief sensory nucleus in the pons
Spinal nucleus in the medulla

11

What is the function of the mesencephalic nucleus

Proprioception

12

What is the function of the chief sensory nucleus

Discriminative touch

13

What is the function of the spinal nucleus

Pain and temperature for structures supplied by the trigeminal as well as general conscious sensation for the viscera supplied by the glossopharyngeal and vagus nerves

14

Where do the trigeminal nerve roots travel

Emerge from the mid-pons and pass forwards onto the apex of the patrols temporal bone where the trigeminal ganglion lies in a cave of dura mater (Meckel’s cave)

15

What is Meckel’s cave

A cave in the dura mater where the trigeminal ganglion is found

16

Where does CN Va pass from the trigeminal ganglion

Anteriorly in the lateral wall of the cavernous sinus to reach the superior orbital fissure

17

Where does CN Vb pass from the trigeminal ganglion

Anteriorly in the lateral wall of the cavernous sinus to reach the pterygopalatine fossa via the foramen rotundum

18

Where does CN Vc pass from the trigeminal ganglion

Through the foramen ovale

19

If all 3 divisions of the trigeminal nerve are affected by a lesion, where must it be

In the pons - stroke
At the cranial base - trauma or tumour

20

Which other nerves are commonly affected if there is a problem in the trigeminal nerve

CN III and CN IV

21

What are the main branches of the opthalmic division of the trigeminal

Frontal
Lacrimal
Nasociliary

22

Describe the path of the frontal nerve and what it supplies

Divides into the supraorbital and supratrochlear nerves which supply the skin of the vertex and upper eyelid and forehead

23

What does the lacrimal nerve supply

The lacrimal gland, skin of the upper eyelid and forehead

24

What does the nasociliary nerve branch into and what does this supply

Gives off long ciliary nerves - anterior and posterior ethmoidal nerves, before continuing as the infratrochlear nerve which supplies the skin of the medial upper eyelid and root of the nose
Anterior ethmoidal nerve continues into the external nasal nerve

25

What supplies the vertex, forehead and upper eyelids

The supratrochlear, supraorbital and lacrimal nerves

26

What supplies the skin at the medial angle of the eye and the root of the nose

The infratrochlear nerve

27

What supplies the skin at the tip of the nose

The external nasal nerve

28

What does the ethmoidal nerve supply

The ethmoidal sinuses
The lateral wall of the nasal cavity
The nasal septum

29

Where is the pterygopalatine fossa found

Lateral to the upper aspect of the nasal cavity and nasopharynx, behind the orbit and above the hard/soft palate

30

Where is the sphenopalatine foramen found

In the medial wall of the pterygopalatine fossa

31

What is found inside the pterygopalatine fossa

Several branches of the second division

32

What are the main branches of CN Vb

Zygomatic
Infra-orbital

33

What are the other branches of CN Vb and what do they supply

Nasopalatine to nasal cavity
Greater and lesser palatine to palate
Pharyngeal to nasopharynx
Alveolar to upper teeth

34

Where does the infraorbital nerve emerge from and what does it supply

The infraorbital foramen
Supplies the lower eyelid, cheek, nose and upper lip

35

Describe the course of the nasopalatine nerve

Enters the nasal cavity via the sphenopalatine foramen to reach the nasal septum where it courses inferiorly and passes the incisive canal to reach the anterior hard palate

36

What nerves supply the teeth

Anterior superior alveolar nerve - Vb
Middle superior alveolar nerve - Vb
Posterior alveolar nerve - Vb

37

What nerves supply the gingivae

Nasopalatine nerve - Vb
Anterior superior alveolar nerve - Vb
Middle superior alveolar nerve - Vb
Greater palatine nerve - Vb