Trigeminal Nerve

Question 1

T/F. CNV is the largest cranial nerve

Answer 1

T

Question 2

CNV has afferent and efferent fibers

Answer 2

Afferent = sensory (from semilunar ganglion)
Efferent = motor
Mesencephalic (third root) = proprioception of TMJ

Question 3

Divisions of CNV (3)

Answer 3

Ophthalmic Nerve
Maxillary Nerve
Mandibular Nerve

Question 4

Smallest division of CNV

Answer 4

CNV1 (Ophthalmic)

Question 5

Division of CNV that exits through superior orbital fissure

Answer 5

CNV1 (Ophthalmic)

Question 6

Purely sensory division of CNV

Answer 6

CNV1 (Ophthalmic) & CNV2 (Maxillary)

Question 7

Division of CNV that exits through foramen rotundum

Answer 7

CNV2 (Maxillary)

Question 8

Largest division of CNV

Answer 8

CNV3 (Mandibular)

Question 9

Mixed nerve division of CNV

Answer 9

CNV3 (Mandibular)

Question 10

Division of CNV that exits through foramen ovale

Answer 10

CNV3 (Mandibular)

Question 11

Nerve that branches off before CNV1 exits the superior orbital fissure

Answer 11

Nervous tentorii (innervates dura mater of the brain)

Question 12

Branches of CN V1 (3)

Answer 12

Lacrimal
Frontal
Nasociliary

Question 13

Innervation of lacrimal nerve

Answer 13

lacrimal gland and conjunctiva

(SKL: smallest nerve)

Question 14

Branches of Frontal nerve (2)

Answer 14

Supraorbital and supratrochlear

Question 15

Innervations of frontal nerve (FSS)

Answer 15

forehead
skin of upper eyelid
scalp

Question 16

Branches of nasociliary nerve (3)

Answer 16

In the orbit (4)
In the nasal cavity
Terminal branches

Question 17

Terminal branch of V1

Answer 17

infratrochlear nerve

Question 18

Innervations of the terminal branch of V1 (LSS)

Answer 18

Lacrimal sac and caruncle

Skin of the medial parts of eyelids

Skin over bridge of nose

Question 19

Nasociliary branches in the orbit (4) (SLAP)

Answer 19

Short ciliary nerves (eyeball) - from long ciliary ganglion

Long ciliary nerve (iris & cornea)

Anterior ethmoid nerve

Posterior ethmoid nerve (ethmoid cells & sphenoid sinus)

Question 20

Branches of Anterior ethmoid nerve

Answer 20

Internal nasal branches (mucous membrane)

External nasal branches (skin over tip of nose and ala of the nose)

Question 21

Pathway of V2

Answer 21

exits the skull through the foramen rotundum > pterygopalatine fossa (near pterygopalatine ganglion) > enter inferior orbital fissure > pass through the infraorbital groove > exit through the infraorbital foramen

Question 22

Branches of V2 (4)

Answer 22

Pterygopalatine
Infraorbital
Terminal branches
Zygomatic

Question 23

Nerve that branches off of V2 before it exits through foramen rotundum

Answer 23

Middle meningeal nerve (innervates dura) (nervous tentorii counterpart)

Question 24

Branches of Zygomatic nerve (2)

Answer 24

Zygomaticotemporal (skin over temporal region)

Zygomaticofacial (skin over zygomatic bone prominence)

Question 25

Terminal branches of CNV2 (3)

Answer 25

Inferior palpebral (skin over lower eyelid) External/Lateral nasal (skin of the nose) Superior labial (upper lip)

Question 26

Branches of the infraorbital nerve (2)

Answer 26

Middle Superior Alveolar (MSAN) - Mx PM to MB root of 6s, supporting structures & facial gingiva Anterior Superior Alveolar (ASAN) - Mx anteriors, supporting structures & facial gingiva

Question 27

Branches of the pterygopalatine nerve (3)

Answer 27

Palatine Nasopalatine Posterior Superior Alveolar (PSAN)

Question 28

Innervations of nasopalatine nerve

Answer 28

Soft tissue of nasal septum; gingiva & palatal soft tissue lingual to anterior teeth

Question 29

Innervation of PSAN

Answer 29

Mx molars except MB root of 6s, supporting structures & facial gingiva; mucosa of partof maxi sinus; cheek mucosa next to maxi molars

Question 30

Branches of Palatine nerve (3)

Answer 30

Greater palatine (mucosa of post. hard palate; palatal gingiva medial to post. teeth) Middle palatine (tonsils; mucosa of soft palate) Lesser palatine (tonsils; mucosa of soft palate)

Question 31

Branches from undivided V3

Answer 31

Nervous spinosus (dura) Nerve to internal pterygoid muscle (internal pterygoid, tensor tympani, & tensor palatini muscles)

Question 32

Branches from divided V3

Answer 32

Anterior (Mainly motor) Posterior (Mainly sensory)

Question 33

Branches of the anterior division of V3 (4)

Answer 33

Long buccal (Mucosa & skin of cheeks up to corner of mouth; buccal gingiva Md molars & sometimes 2nd PMs) = (sensory) Masseteric (masseter & TMJ) Posterior & Anterior temporal (temporalis muscle) Lateral pterygoid

Question 34

Branches of Posterior division of V3 (3)

Answer 34

Auriculotemporal Lingual Inferior Alveolar

Question 35

Branches of the inferior alveolar nerve

Answer 35

Mylohyoid (mylohyoid & digastric) (motor) Dental branch of IAN (Md posteriors & supporting structures) Mental (Facial gingiva of Md anteriors & PMs; mucosa & skin of lower lip & chin to midline) Incisive (Md anteriors & supporting structures)