Canine Skull Foramina and Cranial Nerves

Question 1

What is CN I?

Answer 1

Optic nerve

Question 2

What is CN II?

Answer 2

Olfactory nerve

Question 3

What is CN III?

Answer 3

Oculomotor nerve

Question 4

What is CN IV?

Answer 4

Trochlear nerve

Question 5

What is CN V?

Answer 5

Trigeminal nerve

Question 6

What is CN VI?

Answer 6

Abducens nerve

Question 7

What is CN VII?

Answer 7

Facial nerve

Question 8

What is CN VIII?

Answer 8

Vestibulocochlear nerve

Question 9

What is CN IX?

Answer 9

Glossopharyngeal nerve

Question 10

What is CN X?

Answer 10

Vagus nerve

Question 11

What is CN XI?

Answer 11

Accessory nerve

Question 12

What is CN XII?

Answer 12

Hypoglossal nerve

Question 13

What nerve runs through the hypoglossal canal?

Answer 13

CN XII Hypoglossal nerve

Question 14

What nerves run into the tympano-occipital fissure and out the jugular foramen?

Answer 14

• CN IX glossopharyngeal nerve
• CN X vagus nerve
• CN XI accessory nerve

Question 15

The tympanic bulla is associated with what portion of the ear?

Answer 15

middle ear

Question 16

What process covers the cerebellum?

Answer 16

tentorial process

Question 17

What is the main sensory nerve of the head?

Answer 17

CN V trigeminal nerve

Question 18

What nerves are associated with the internal acoustic meatus?

Answer 18

• CN VII facial nerve
• CN VIII vestibulocochlear nerve

Question 19

What nerve runs through the stylomastoid foramen?

Answer 19

CN VII facial nerve

Question 20

What houses the tympanic membrane?

Answer 20

External acoustic meatus

Question 21

If you pass the tympanic membrane, then you enter what?

Answer 21

tympanic cavity (middle ear)

Question 22

The retroarticular foramen houses what?

Answer 22

Retroarticular vein

Question 23

The entrance into the tympanic cavity is typically sealed by what?

Answer 23

tympanic membrane

Question 24

The retroarticular vein gives origin to what other vein?

Answer 24

Maxillary vein

Question 25

What is the short bony canal where the tympanic membrane is attached and is the landmark between the middle and the external ear?

Answer 25

external acoustic meatus

Question 26

What is the air filled bony cavity in the tympanic portion of temporal bone that forms the tymapnic cavity of the middle ear and where the three small ossicles live?

Answer 26

Tympanic bulla

Question 27

The tympanic bulla should be filled with air, which means it should appear as what color on XRAY?

Answer 27

gray

Question 28

What fissure is located medial to the tympanic bulla?

Answer 28

Tympanooccipital fissure

Question 29

The orbital fissure of the basisphenoid bone has what nerves?

Answer 29

- oculomotor nerve CN III - trochlear nerve CN IV - adbucens nerve CN VI - opthalamic nerve CN V1

Question 30

The round foramen of the basisphenoid bone has what nerve?

Answer 30

maxillary nerve CN V2

Question 31

The oval foramen of the basisphenoid bone has what nerve?

Answer 31

mandibular nerve CN V3

Question 32

What are the three branches of trigeminal nerve CN V?

Answer 32

- opthalamic nerve V1 - maxillary nerve V2 - mandibular nerve V3

Question 33

What is the most caudal bony prominence of the sella turcica?

Answer 33

dorsum sellae

Question 34

What is the fossa for the hypophysis, in the middle of a lrger depression known as sella tucica?

Answer 34

hypophyseal fossa

Question 35

What nerve runs through the optic canals of the presphenoid bone?

Answer 35

optic nerve CN II

Question 36

What is the bony groove for the nervous structure known as optic chasm that correspond to the optic nerves crossover?

Answer 36

Chiasmatic groove

Question 37

The frontal sinus opens where?

Answer 37

to nasal cavity

Question 38

The frontal sinus appears as what color on XRAY due to air?

Answer 38

dark grey/almost black

Question 39

What is the bony wall between the cranial and nasal cavities?

Answer 39

cribriform plate

Question 40

The cribriform plate of the ethmoidal bone has what nerves?

Answer 40

- olfactory nerves CN I - vomeronasal nerves

Question 41

The lacrimal bone has a fossa for what?

Answer 41

lacrimal sac

Question 42

What is the bony canal between the infraorbital formane and maxillary foramen?

Answer 42

infraorbital canal

Question 43

What nerve enters the infraorbital canal at the maxillary foramen and exits via the infraorbital foramen?

Answer 43

maxillary nerve CN V2

Question 44

Where is a good spot to numb the maxilla?

Answer 44

Infraorbital foramen

Question 45

The sphenopalatine foramen has branches of maxillary nerve V2 for sensation of what?

Answer 45

nasal cavity

Question 46

The caudal palatine foramen has branches of maxillary nerve V2 for sensation of what?

Answer 46

palate

Question 47

The major and minor palatine foramens has branches of what nerve?

Answer 47

maxillary nerve CN V2

Question 48

What is the bony canal inside the mandible?

Answer 48

mandibular canal

Question 49

What is the caudal opening of the mandibular canal?

Answer 49

mandibular foramen

Question 50

What is the rostral opening of the mandibular canal?

Answer 50

mental foramina

Question 51

What nerve runs through the mandibular canal?

Answer 51

branch of mandibular nerve CN V3

Question 52

What fissure sits between the basioccipital and temporal bones and connects inside with the jugular foramen?

Answer 52

tympanooccipital fissure

Question 53

What nerves/vessels may be affected in a fracture of the tympanic bulla or an accident during a middle ear surgery?

Answer 53

- glossopharyngeal nerve CN IX - vagus nerve CN X - accessory nerve CN XI - internal carotid artery - internal carotid vein

Question 54

What foramen sits between the petrosal portion of the temporal bone and the basioccipital and connects outside through the tympanooccipital foramen?

Answer 54

jugular foramen

Question 55

What canal is found in the most rostral angle of the petrosal portion of the temporal bone?

Answer 55

canal for trigeminal nerve

Question 56

What contains the bodies of the pseudo unipolar afferent nerves from CN V?

Answer 56

trigeminal ganglion

Question 57

What fissure contains the motor nerve for the extrinsic muscles of the eye?

Answer 57

orbital fissure

Question 58

The relationship between vomer and the perpendicular plate of ethmoidal bone forms what?

Answer 58

the osseous part of the nasal septum

Question 59

What foramen can be related with the upper 4th premolar tooth?

Answer 59

infraorbital foramen