USMLE Step 1: Skull Foramina Drill

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All 35 Questions (Batches 1, 2, & 3)

Complete Review

Focus on CN I-VI

Key fissures and canals

Focus on CN VII-XII

Jugular foramen, magnum, extras

Note: Wrong answers will reappear until mastered.

Progress: 0/0 Accuracy: 100%

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All Foramina Overview

Cranial Fossa Map

Cranial Fossa	Foramen	Traversing Structures
Anterior	Cribriform plate	CN I olfactory bundles
Middle	Optic canal	CN II, ophthalmic artery, central retinal vein
Middle	Superior orbital fissure	CNs III, IV, V1, VI; ophthalmic vein; sympathetic fibers
Middle	Foramen rotundum	CN V2 (maxillary)
Middle	Foramen ovale	CN V3 (mandibular)
Middle	Foramen spinosum	Middle meningeal artery & vein
Posterior	Internal acoustic meatus	CNs VII, VIII
Posterior	Jugular foramen	CN IX, X, XI, jugular vein
Posterior	Hypoglossal canal	CN XII
Posterior	Foramen magnum	Spinal roots of CN XI, brainstem, vertebral arteries

"Standing Room Only" (Trigeminal exits):
- Superior orbital fissure: V1
- Rotundum: V2
- Ovale: V3
Foramen Ovale Content (OVALE):
- Otic ganglion (inferior)
- V3
- Accessory meningeal artery
- Lesser petrosal nerve
- Emissary veins
"Middle" Mnemonic: The Middle meningeal artery goes through Foramen Spinosum.
Facial Nerve Path: "Enter through the Internal (acoustic meatus), exit through the Stylomastoid."