Tell all the names of foramens of anterior, middle and posterior cranial fossa from Ak Datta, Vishram Singh, or BD Chaurasia
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Anterior cranial fossa
- Foramen caecum
- Foramina in the cribriform plate of ethmoid - olfactory foramina
- Anterior ethmoidal foramen
- Posterior ethmoidal foramen
Middle cranial fossa
- Optic canal
- Superior orbital fissure
- Foramen rotundum
- Foramen ovale
- Foramen spinosum
- Foramen lacerum
- Hiatus for greater petrosal nerve
- Hiatus for lesser petrosal nerve
- Carotid canal - its internal opening
- Pterygoid canal - its posterior opening, sometimes included in detailed lists
Posterior cranial fossa
- Foramen magnum
- Internal acoustic meatus
- Jugular foramen
- Hypoglossal canal
- Condylar canal
- Mastoid foramen
- Aperture of vestibular aqueduct
- Aperture of cochlear canaliculus
For a standard short-answer anatomy list, memorize the bold core openings first. The precise inclusion of small canals and apertures can vary slightly between AK Datta, Vishram Singh, and BD Chaurasia. Gray's table similarly lists the principal openings: anterior fossa - foramen caecum and olfactory foramina; middle fossa - optic canal, superior orbital fissure, rotundum, ovale, spinosum, and petrosal nerve hiatuses; posterior fossa - magnum, internal acoustic meatus, jugular foramen, hypoglossal canal, and condylar canal. Gray's Anatomy for Students, p. 1003.
Now tell the transmitting structures of these formanes
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cranial fossa foramina transmitting structures anatomy table
Anterior cranial fossa
| Foramen/opening | Structures transmitted |
|---|---|
| Foramen caecum | Emissary vein connecting veins of nasal cavity with the superior sagittal sinus. It may be closed. |
| Cribriform foramina of ethmoid | Filaments of the olfactory nerve (CN I) from nasal mucosa to olfactory bulb. |
| Anterior ethmoidal foramen | Anterior ethmoidal nerve, artery, and vein. |
| Posterior ethmoidal foramen | Posterior ethmoidal nerve, artery, and vein. |
Middle cranial fossa
| Foramen/opening | Structures transmitted |
|---|---|
| Optic canal | Optic nerve (CN II), ophthalmic artery, and sympathetic fibers from internal carotid plexus. |
| Superior orbital fissure | Oculomotor nerve (CN III), trochlear nerve (CN IV), ophthalmic division of trigeminal nerve (CN V1: lacrimal, frontal and nasociliary branches), abducens nerve (CN VI), superior ophthalmic vein, and sympathetic fibers. |
| Foramen rotundum | Maxillary nerve (CN V2). |
| Foramen ovale | Mandibular nerve (CN V3), lesser petrosal nerve, accessory meningeal artery, and emissary vein connecting cavernous sinus with pterygoid venous plexus. |
| Foramen spinosum | Middle meningeal artery, middle meningeal vein, and meningeal branch of mandibular nerve, also called nervus spinosus. |
| Foramen lacerum | Filled with fibrocartilage in life. Small emissary veins and meningeal branch of ascending pharyngeal artery pass through/near it. Greater and deep petrosal nerves meet at its upper part to form the nerve of pterygoid canal. Internal carotid artery passes over its superior surface, not through the foramen. |
| Hiatus for greater petrosal nerve | Greater petrosal nerve and petrosal branch of middle meningeal artery. |
| Hiatus for lesser petrosal nerve | Lesser petrosal nerve. |
| Carotid canal, internal opening | Internal carotid artery, internal carotid sympathetic plexus, and venous plexus accompanying the artery. |
| Pterygoid canal | Nerve of pterygoid canal (Vidian nerve, formed by greater petrosal plus deep petrosal nerves), artery and vein of pterygoid canal. |
Posterior cranial fossa
| Foramen/opening | Structures transmitted |
|---|---|
| Foramen magnum | Medulla continuing as spinal cord with meninges; vertebral arteries; anterior and posterior spinal arteries; spinal roots of accessory nerve (CN XI); venous plexus; tectorial membrane and apical ligament of dens. |
| Internal acoustic meatus | Facial nerve (CN VII), vestibulocochlear nerve (CN VIII), labyrinthine artery and veins. |
| Jugular foramen | Glossopharyngeal (CN IX), vagus (CN X), and accessory (CN XI) nerves; inferior petrosal sinus; sigmoid sinus continuing as internal jugular vein; meningeal branches of occipital and ascending pharyngeal arteries. |
| Hypoglossal canal | Hypoglossal nerve (CN XII), meningeal branch of ascending pharyngeal artery, and accompanying venous plexus/emissary vein. |
| Condylar canal | Condylar emissary vein, connecting sigmoid sinus with suboccipital venous plexus. A meningeal branch of occipital artery may accompany it. |
| Mastoid foramen | Mastoid emissary vein connecting sigmoid sinus to posterior auricular or occipital veins; meningeal branch of occipital artery. |
| Aperture of vestibular aqueduct | Endolymphatic duct and vein. |
| Aperture of cochlear canaliculus | Perilymphatic duct and a small vein. |
High-yield corrections
- Foramen lacerum is not traversed by the internal carotid artery. The ICA exits the carotid canal and runs across the upper surface of the cartilage filling the foramen.
- CN XI has spinal roots that enter the cranial cavity through the foramen magnum, then the nerve exits through the jugular foramen.
- Superior orbital fissure is technically a fissure, but is routinely included among the foramina/openings of the middle cranial fossa.
The principal textbook list is consistent with Gray's Anatomy for Students, p. 1003. For a broader check of named skull openings and their neurovascular contents, see the NCBI anatomy review.
Create a one-page table of all foramina and contents
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Cranial foramina and transmitted structures
| Cranial fossa | Foramen / opening | Structures transmitted |
|---|---|---|
| Anterior | Foramen caecum | Emissary vein to superior sagittal sinus, if patent |
| Cribriform foramina | Olfactory nerve filaments, CN I | |
| Anterior ethmoidal foramen | Anterior ethmoidal nerve, artery, vein | |
| Posterior ethmoidal foramen | Posterior ethmoidal nerve, artery, vein | |
| Middle | Optic canal | Optic nerve, CN II; ophthalmic artery; sympathetic fibers |
| Superior orbital fissure | CN III, CN IV, CN V1 (lacrimal, frontal, nasociliary branches), CN VI; superior ophthalmic vein; sympathetic fibers | |
| Foramen rotundum | Maxillary nerve, CN V2 | |
| Foramen ovale | Mandibular nerve, CN V3; lesser petrosal nerve; accessory meningeal artery; emissary vein | |
| Foramen spinosum | Middle meningeal artery and vein; meningeal branch of V3, nervus spinosus | |
| Foramen lacerum | Filled with cartilage in life; emissary veins and meningeal branch of ascending pharyngeal artery. Greater and deep petrosal nerves cross its upper part to form Vidian nerve. ICA passes over it, not through it. | |
| Carotid canal | Internal carotid artery; carotid sympathetic plexus; accompanying venous plexus | |
| Hiatus for greater petrosal nerve | Greater petrosal nerve; petrosal branch of middle meningeal artery | |
| Hiatus for lesser petrosal nerve | Lesser petrosal nerve | |
| Pterygoid canal | Nerve, artery, and vein of pterygoid canal | |
| Posterior | Foramen magnum | Medulla continuing as spinal cord with meninges; vertebral arteries; anterior and posterior spinal arteries; spinal roots of CN XI; venous plexus; tectorial membrane and apical ligament of dens |
| Internal acoustic meatus | Facial nerve, CN VII; vestibulocochlear nerve, CN VIII; labyrinthine artery and veins | |
| Jugular foramen | CN IX, CN X, CN XI; inferior petrosal sinus; sigmoid sinus continuing as internal jugular vein; meningeal arterial branches | |
| Hypoglossal canal | Hypoglossal nerve, CN XII; meningeal branch of ascending pharyngeal artery; venous plexus | |
| Condylar canal | Condylar emissary vein; occasionally a meningeal branch of occipital artery | |
| Mastoid foramen | Mastoid emissary vein; meningeal branch of occipital artery | |
| Aperture of vestibular aqueduct | Endolymphatic duct and vein | |
| Aperture of cochlear canaliculus | Perilymphatic duct and small vein |
Important: In standard MBBS answers, the principal foramina listed in BD Chaurasia, Vishram Singh, and AK Datta are usually sufficient. Smaller apertures, such as the cochlear canaliculus and vestibular aqueduct, may be added for a complete answer. The core list agrees with Gray's Anatomy for Students, p. 1003, and the NCBI skull-foramina review.
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