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Cranial Cavity. R. Shane Tubbs, MS, PA-C, Ph.D. Anterior Cranial Fossa. Middle Cranial Fossa. Posterior Cranial Fossa. CRANIAL FOSSAE. Bones. Frontal. Anterior. Ethmoid. Sphenoid. Middle. Temporal. Parietal. Posterior. Occipital. CN I. CN III CN IV CN V 1 CN VI. CN II.
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Cranial Cavity R. Shane Tubbs, MS, PA-C, Ph.D.
Anterior Cranial Fossa Middle Cranial Fossa Posterior Cranial Fossa
CRANIAL FOSSAE Bones Frontal Anterior Ethmoid Sphenoid Middle Temporal Parietal Posterior Occipital
CN I CN III CN IV CN V1 CN VI CN II CN V2 CN V3 CN VII CN VIII CN IX CN X CN XI CN XII
Diploic Extracranial Cerebral Emissary Dural Venous Sinus
emissary v. diploic veins
Tentorium cerebelli Falx Cerebri
Superior Sagittal Sinus Sphenoparietal Cavernous Basilar Superior Petrosal Sigmoid Transverse Straight Confluence Tentorium Cerebelli
Dural Sinuses Superior Sagittal Inferior Sagittal Great Cerebral Straight Sup/Inf Petrosal Confluence Occipital Transverse Sigmoid Falx Cerebri
Pituitary Gland CN III CN IV Internal Carotid CN VI CN V1 ?CN V2 CAVERNOUS SINUS & CONTENTS
Cavernous sinus Superior ophthalmic vein Angular vein Inferior ophthalmic vein Pterygoid venous plexus Facial vein Maxillary vein Deep facial vein Retromandibular vein
Connections of facial vein • Directly to cavernous sinus by superior ophthalmic vein or inferior ophthalmic vein • Indirectly by pterygoid venous plexus by inferior ophthalmic vein or deep facial vein
Danger triangle of face Normally blood drains from medial angle of the eye, nose and lips – into facial vein Because facial veins don’t have valves blood can drain into cavernous sinus.
Anterior Communicating Anterior Cerebral Middle Cerebral Posterior Communicating Posterior Cerebral Basilar Vertebral Cerebral Arterial Circle (of Willis) Internal Carotids