Anatomy 3: Clinical Anatomy of the Cranial Nerves

Question 1

Which is the only CN to attach to the pons?

Answer 1

Trigeminal (V)

Question 2

V1 supplies (superficial)

Answer 2

Upper eyelid
Cornea
Conjunctiva

Question 3

V2 supplies (superficial)

Answer 3

Skin of lower eyelid
Skin over maxilla
Ala of nose
Skin + mucosa of upper lip

Question 4

V3 supplies (superficial)

Answer 4

Skin over mandible and TMJ

Note that angle of mandible is supplied by C2 and C3 spinal nerves (great auricular nerve)

Question 5

Which branch of trigeminal has motor as well as sensory function?

Answer 5

V3 (mandibular)

Question 6

V3 supplies motor innervation to?

Answer 6

Muscles of mastication
Tensor veli palantini (soft palette)
Tensor tympani (inner ear)

Question 7

Which nerve innervates the muscles of mastication?

Answer 7

V3

Question 8

Which nerve innervates the cornea?

Answer 8

V1

Question 9

Which nerve innervates the ala of the nose?

Answer 9

V2

Question 10

Which CN is associated with Bell’s Palsy and Ramsay Hunt Syndrome?

Answer 10

VII (facial)

Question 11

Whats the name of the branch that leaves the facial nerve at the gerniculate ganglion?

Answer 11

Greater petrosal n.

Question 12

The greater petrosal n. is a branch of what?

Answer 12

CN VII (facial)

Question 13

The corda tympani is a branch of?

Answer 13

CN VII (facial)

Question 14

The tensor tympani is innervated by?

Answer 14

V3

Question 15

Which nerve does the Corda Tympani ‘hitch a ride with’?

Answer 15

Lingual n. (branch of CN V3)

Question 16

The facial n. (CN VII) passes leaves the floor of the cranium through the __ , passes along the __ , forms the __ where the __ branches from it, before continuing to the __ which comes just after the __ branches off.

Answer 16

The facial n. (CN VII) passes leaves the floor of the cranium through the INTERNAL ACOUSTIC MEATUS , passes along the FACIAL CANAL , forms the GERNICULATE NUCLEUS where the GREATER PETROSAL N. branches from it, before continuing to the STYLOMASTOID FORAMEN which comes just after the CORDA TYMPANI branches off.

Question 17

Corda tympani is responsible for?

Answer 17

Taste for ant. 2/3rds of tongue

Presynaptic parasympathetic motor innervation for submandibular and sublingual salivary glands

Question 18

Muscles of facial expression are supplied by?

Answer 18

Facial (VII)

Question 19

Name the 5 branches of the facial nerve

Answer 19

Temporal
Zygomatic
Buccal
Marginal mandibular
Cervical

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Question 20

Which CN supplies special sensory to valate pupillae of post. 1/3 of tongue?

Answer 20

Glossopharyngeal (IX)

Question 21

Which CN supplies sympathetic secretomotor innervation to parotid salivary gland?

Answer 21

Glossopharyngeal (IX)

Question 22

What innervates the eustachian tube and middle ear cavity?

Answer 22

Glossopharyngeal (IX)

Question 23

Vagus (X) descends neck via the?

Answer 23

Carotid sheath

Question 24

Recurrent laryngeal nerves are branches of?

Answer 24

Vagus (X)

Question 25

How does the Vagus nerve pass through the diaphragm?

Answer 25

Forms plexus around oesophagus and passes through at T10 spinal level

Question 26

From diaphragm on, L and R Vagus nerves are named ?

Answer 26

Ant and Post vagal trunks

Question 27

The very last parasympathetic axons pass to the?

Answer 27

Splenic flexure of the colon