Opening in the Base of the Skull and the Structures that Pass Through Them

Question 1

Perforations in the Cribriform plate

Answer 1

Ethmoid

Olfactory nerves

Question 2

Optic Canal

Answer 2

Lesser wing of Sphenoid

Optic nerve, ophthalmic artery

Question 3

Superior Orbital Fissure

Answer 3

Between lesser and greater wings of the Sphenoid

Lacrimal, frontal, trochlear, oculomotor, nasociliary, and abducent nerves; superior ophthalmic vein

Question 4

Foramen Rotundum

Answer 4

Greater wing of the Sphenoid

Maxillary Division of the Trigeminal Nerve

Question 5

Foramen Ovale

Answer 5

Greater wing of the Sphenoid

Mandibular division of the trigeminal nerve

Question 6

Foramen Spinosum

Answer 6

Greater wing of the Sphenoid

Middle meningeal artery

Question 7

Foramen Lacerum

Answer 7

Between petrous part of temporal and Sphenoid

Internal carotid artery

Question 8

Foramen Magnum

Answer 8

Occipital

Medulla Oblangata, spinal part of accessory nerve, and right and left vertebral arteries

Question 9

Hypoglossal Canal

Answer 9

Occipital

Hypoglossal Nerve

Question 10

Jugular Foramen

Answer 10

Between petrous part of temporal and condylar part of occipital

Glossopharyngeal, vagus, and accessory nerves; sigmoid sinus becomes internal jugular vein

Question 11

Internal Acoustic Meatus

Answer 11

Petrous part of temporal

Vestibulocochlear and facial nerves

Question 12

Anterior Cranial Fossa

Answer 12

Perforations in the Cribriform Plate

Question 13

Middle Cranial Fossa

Answer 13

Optic Canal
Superior Orbital Fissure
Foramen Rotundum
Foramen Ovale
Foramen Spinosum
Foramen Lacerum

Question 14

Posterior Cranial Fossa

Answer 14

Foramen Magnum
Hypoglossal Canal
Jugular Foramen
Internal Acoustic Meatus