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MIDDLE CRANIAL FOSSA and structures passing through
- 1. MIDDLE CRANIAL FOSSA DR. JITENLAD 2ND YEAR RESIDENT DOCTOR DEPT OF E.N.T
- 2. INTERNAL SURFACE OFBASE OF SKULL • Internal surface of base of skull presents natural subdivisions into anterior, middle and posterior cranial fossae.
- 3. MIDDLE CRANIAL FOSSA •It is deeper than the anterior cranial fossa. • It is shaped like a butterfly, being narrow and shallow in the middle; wide and deep on each side.
- 4. BOUNDRIES • Anterior:- Posterior borderof lesser wing of Sphenoid Anterior clinoid process Anterior margin of Sulcus Chiasmaticus.
- 5. • Posterior:- Superior borderof petrous part of temporal bone Dorsum Sella of Sphenoid • Lateral:- Greater wing of sphenoid Anteroinferior angle of parietal bone Squamous part of temporal bone • Floor:- Sphenoid in median region
- 6. FORAMEN CONTENT OPTIC CANAL-OPTIC NERVE (CN II) -OPTHALMIC ARTERIES SUPERIOR ORBITAL FISSURE -OPTHALMIC VEIN -OPTHALMIC NERVE (CN V1) -CRANIAL NERVE III, IV, VI -SYMPATHETIC FIBERS FORAMEN ROTUNDUM -MAXILLARY NERVE ( CN V2) FORAMEN OVALE -MANDIBULAR NERVE ( CN V3) -ACCESSORY MENINGEAL ARTERY -LESSER PETROSAL NERVE -EMISSARY VEIN FORAMEN SPINOSUM -MIDDLE MENINGEAL ARTERYAND VEIN -EMISSARY VEIN -NERVUS SPINOSUS (MENINGEAL BRANCH OF MANDIBULAR NERVE) FORAMEN LACERUM -MEINGEAL BRANCH OF ASCENDING PHARYNGEALARTERY -EMISSARY VEIN -GREATER PETROSAL NERVE -INTERNAL CAROTID ARTERY
- 8. CAROTID CANAL -INTERNALCARTID ARTERY -INTERNAL CAROTID VENOUS PLEXUS -SYMPATHETIC NERVE PLEXUS HIATUS FOR LESSER PETROSAL NERVE -LESSER PETROSAL NERVE HIATUS FOR GREATER PETROSAL NERVE -GREATER PETROSAL NERVE -PETROSAL BRANCH OF MIDDLE MENINGEAL ARTERY