Foramina and Canals of Cranial Base

Question 1

Incisive Fossa

Answer 1

Nasopalatine N., Sphenopalatine vessels

Question 2

Greater Palatine Foramen

Answer 2

Greater Palatine N. & Vessels

Question 3

Lesser Palatine Foramen

Answer 3

Lesser Palatine N. & Vessels

Question 4

Foramen Lacerum

Answer 4

Greater Petrosal N.

Question 5

Foramen Ovale

Answer 5

Lesser Petrosal N., Mandibular N.( v3), Accessory Meningeal A.

Question 6

Foramen Spinosum

Answer 6

Middle Meningeal vessels, Meningeal branch of mandibular nerve(V3)

Question 7

Carotid Canal

Answer 7

Internal Carotid, Carotid Autonomic plexus

Question 8

Petrotympanic Fissure

Answer 8

Chorda tympani of Facial N.(vii)

Question 9

Tympanic Canaliculus

Answer 9

Tympanic Branch of vagus N (ix)

Question 10

Mastoid canaliculus

Answer 10

Auricular Branch pf Vagus N. (x)

Question 11

Stylomastoid Foramen

Answer 11

Facial Nerve (vii)

Question 12

Jugular Fossa

Answer 12

Glossopharyngeal N. (ix), Vagus N. (x) , Accessory N.(xi), Superior Bulb, InternalJugular V.

Question 13

Mastoid Foramen

Answer 13

Mastoid Emissary V., Posterior Meningeal A.

Question 14

Hypoglossal Canal

Answer 14

Hypoglossal N. (xii)

Question 15

Foramen Magnum

Answer 15

Meddulla Oblongata, Vertebral A. & venous plexus, Spinal Roots of Accessory N (xi)

Question 16

Foramen Cecum

Answer 16

Emissary V. to Superior Sagittal Sinus

Question 17

Nasal slit & Anterior Ethmoidal Foramen

Answer 17

Anterior Ethmoidal A.,V.& Nerve

Question 18

Foramina of Cribriform Plate

Answer 18

Olfactory N.

Question 19

Posterior Ethmoidal Foramen

Answer 19

Posterior ethmoidal A.,V.,& N.

Question 20

Optic Canal

Answer 20

Optic N. (ii) Ophthalmic A.

Question 21

Superior Orbital Fissure

Answer 21

Oculomotor N. (iii) , Trochlear N. (iv) , Lacrimal, frontal & nasociliary Branches of Ophthalmic N(V1) Abducent N (vi) Superior Ophthalmic N. (v1), Abducent N. (v1), Superior ophthalmic V.

Question 22

foramen Rotundum

Answer 22

Maxillary N.(v2)

Question 23

Foramen Ovale

Answer 23

Mandibular N. (v2), Accessory Meningeal A., Lesser Petrosal N.

Question 24

Foramen Spinosum

Answer 24

Middle Meningeal A. & V., Meningeal Branch of Mandibular N.

Question 25

Foramen Lacerum

Answer 25

Greater petrosal N.

Question 26

Sphenoidal Emissary Foramen

Answer 26

of Vesalius( Inconstant)

Question 27

Carotid Canal

Answer 27

Internal Carotid A. & Nerve Plexus

Question 28

(x2) Hiatus for

Answer 28

Lesser Petrosal N. and Greater Petrosal N.

Question 29

Internal Acoustic Meatus

Answer 29

Facial N. (vii) , Vestibulocochlear N. (viii), Labyrinthine A.

Question 30

Opening of Vestibular Aqueduct

Answer 30

Endolymphatic duct

Question 31

Mastoid Foramen ( inconstant)

Answer 31

Emissary V.

Question 32

Jugular Foramen

Answer 32

Inferior Petrosal Sinus, Glossopharyngeal N. (ix), Vagus N. (x) , Accessory N. (xi), Sigmoid sinus, Posterior Meningeal A.

Question 33

Condylar Canal ( inconstant)

Answer 33

Emissary V. and Meningeal Branch of ascending pharyngeal A.

Question 34

Hypoglossal Canal

Answer 34

Hypoglossal N. (xii),

Question 35

Foramen Magnum

Answer 35

Medulla Oblongata, Meninges, Vertebral A., Meningeal Branches of Vertebral A., Spinal roots of accessory N.