Foramen Ovale — Contents and Relations
Location
- Oval-shaped foramen in the greater wing of sphenoid bone
- Situated in the floor of the middle cranial fossa
- Located posterolateral to foramen rotundum and anteromedial to foramen spinosum
Contents
Mnemonic: MALE
| Letter | Structure |
|---|---|
| M | Mandibular nerve (V3) — both sensory and motor roots |
| A | Accessory meningeal artery (branch of maxillary artery) |
| L | Lesser petrosal nerve (carrying parasympathetic fibres from CN IX to otic ganglion) |
| E | Emissary vein (connecting cavernous sinus to pterygoid venous plexus) |
Lesser petrosal nerve exits through foramen ovale (or occasionally a separate small canal/foramen of Arnold just medial to it).
Relations
| Relation | Structure |
|---|---|
| Above (intracranial) | Middle cranial fossa; trigeminal ganglion (Gasserian ganglion) lies just medial |
| Below (extracranial) | Infratemporal fossa; otic ganglion lies immediately below |
| Medial | Foramen lacerum |
| Lateral | Foramen spinosum (transmits middle meningeal artery) |
| Posterior | Spine of sphenoid |
Comparison with Adjacent Foramina
| Foramen | Contents | Division of V |
|---|---|---|
| Foramen rotundum | Maxillary nerve (V2) | V2 |
| Foramen ovale | Mandibular nerve (V3) + MALE | V3 |
| Foramen spinosum | Middle meningeal artery + meningeal branch of V3 (nervus spinosus) | — |
Clinical Significance
Percutaneous Trigeminal Rhizotomy (Radiofrequency/Glycerol):
- Needle inserted through the cheek into foramen ovale under fluoroscopic guidance
- Access to trigeminal (Gasserian) ganglion for treatment of trigeminal neuralgia
- Standard percutaneous approach for V3 distribution trigeminal neuralgia
Skull Base Tumours:
- Nasopharyngeal carcinoma and other skull base tumours can invade through foramen ovale → V3 palsy (loss of sensation lower face + jaw weakness)