Foramina, Fissures, Or Canals

Question 1

Olfactory foramina

Answer 1

Olfactory n (CN I)
Nasociliary n (eventually anterior ethmoidal n) from CN V1

Question 2

Pterygoid/vidian canal

Answer 2

Pterygoid/vidian n (greater petrosal n from facial n CN VII + deep petrosal n from ICA sympathetic plexus)
Pterygoid vessels

Question 3

Foramen rotundum

Answer 3

Maxillary n. (CN V2)

Question 4

Foramen ovale

Answer 4

Mandibular n (CN V3)

Question 5

Foramen spinosum

Answer 5

Middle meningial a

Question 6

Petrotympanic fissure

Answer 6

Chorda tympani n. (from facial n CN VII)

Question 7

Hiatus canalis facialis

Answer 7

Greater petrosal n (from facial n. CN VII)

Question 8

Internal auditory meatus

Answer 8

Facial n. (CN VII)
Vestibulocochlear n. (CN VIII)
Labyrinthine a.

Question 9

Foramen lacernum

Answer 9

Greater petrosal n. (from facial n. CN VII) - passes through the top of the foramen as it enters the carotid canal to emerge with deep petrosal n. (from sympathetics)
ICA and carotid plexus cross the foramen horizontally

Question 10

Jugular foramen

Answer 10

Internal jugular v.
Glossopharyngeal n. (CN IX)
Vagus n. (CN X)
Accessory n. (CN XI)

Question 11

Hypoglossal canal

Answer 11

Hypoglossal n. (CN XII)

Question 12

Foramen magnum

Answer 12

Medulla oblongata
Accessory n. (CN XI)
Vertebral a.

Question 13

Stylomastoid foramen

Answer 13

Facial n. (CN VII)

Question 14

Supraorbital foramen

Answer 14

Supraorbital n. (from CN V1)

Supraorbital vessels

Question 15

Infraorbital foramen

Answer 15

Infraorbital a.

Infraorbital n. (from CN V2)

Question 16

Mental foramen

Answer 16

Mental n. (from CN V3)

Mental vessels

Question 17

Mandibular foramen

Answer 17

Inferior alveolar vessels

Inferior alveolar n. (from CN V3)

Question 18

Greater palatine foramen

Answer 18

Greater palatine n. (From CN V2 and pterygoid n.)

Greater palatine vessels

Question 19

Lesser palatine foramen

Answer 19

Lesser palatine n. (From CN V2)

Lesser palatine vessels

Question 20

Incisive foramen

Answer 20

Nasopalatine n. (From CN V2)

Question 21

Lacrimal groove

Answer 21

Nasolacrimal sac and duct

Question 22

Optic canal

Answer 22

Optic n. (CN II)

Ophthalmic a.

Question 23

Superior orbital fissure

Answer 23

Trochlear n. (From CN VIII)
Frontal n. (From CN V1)
Lacrimal n. (From CN V1)
Abducens n. (CN VI)
Oculomotor n. (CN III)
Superior ophthalmic v.

Question 24

Inferior orbital fissure

Answer 24

Maxillary n. (CN V2)

Infraorbital vessels