clinical anatomy circle of willis & cavernous sinus
DESCRIPTION
This presentation will guide you through the basic anatomy of the Cirlce of Willis and Cavernous SinusTRANSCRIPT
Circle of Willisand
Cavernous Sinus
Clinical Anatomy
Dr. Ankit M. PunjabiDept of Ophthalmology,
KIMS Hospital,Bangalore
Karnataka, INDIA
CIRCLE OF
WILLIS
TERRITORIES OF MAJOR ARTERIES OF BRAIN
TERRITORIES OF MAJOR ARTERIES OF BRAIN
TERRITORIES OF MAJOR ARTERIES OF BRAIN
Representationto show
major arterial supplyin the Circle of Willis
• Cerebral Infarction • Transient Ischemic Attacks• Vascular Malformations (Aneurysm, etc)• Intracranial Hemorrhage• Tumors of adjacent structures• Inflammatory Diseases of Arteries
Common Sites for Plaque Formation
• Internal Carotid– Ipsilateral blindness– Contralateral hemiparesis– Contralateral hemianesthesia– Hemianopia– Aphasia, hemineglect
• Middle Cerebral – Main trunk : Hemiplegia, hemianesthesia,
hemianopia, Aphasia– Upper division : Hemiparesis & sensory loss ( arm/face > leg)– Lower division : Wernicke Aphasia– Penetrating Artery : pure motor hemiparesis
Common Sites for Plaque Formation
• Anterior Cerebral– Hemiparesis & sensory loss (leg>arm)– Impaired responsiveness
• Posterior Cerebral– Cortical (U/L) : isolated hemianopia
(or quadrantic defect), color anomia
– Cortical (B/L) : cerebral blindness (+/- macular sparing)
– Thalamic : Pure sensory stroke– Subthalamic : Hemiballism– B/L inf temporal lobe : Amnesia– Midbrain : Oculomotor &
other Cr. N. palsy
30-35%
30-35%
20%
5%
5%
• Macular area is watershed area
CAVERNOUS SINUS
CAVERNOUS SINUS
Structures in lateral wall
• Oculomotor nerve• Trochlear nerve• Ophthalmic nerve
• Lacrimal• Frontal• Nasociliary
• Maxillary nerve• Trigeminal ganglion
Structures in centre of sinus
• Internal carotid artery• Men.Hypo. A• Capsular A• A. to Cav sinus
• Sympathetic plexuses• Abducent nerve
VENOUSVASCULATUREOF BASE OF SKULL
1.Sup. Oph. Vein2.Ant. Int. Cav. Sinus3.Inf. Oph. Vein4.Pterygoid Plexus5.Mid. Menng. Vein6.Sup. Petr. Sinus7.Inf. Petr. Sinus8.Basilar plexus9.Transverse Sinus10.Post. Int. Cav. Sinus11.Cavernous Sinus12.Sphenoparietal Sinus
CAVERNOUS SINUS SYNDROMES• Multiple cranial neuropathies:
– Unilateral & isolated 3rd ,4th,5th, 6th nerve palsy– Conbimation patterns of ophthalmoplegia– Painful ophthalmoplegia– Proptosis– Ocular & cranial bruits– Conjunctival congestion, arterialization of conjunctival veins– Ocular hypertension– Optic disc edema/pallor– Retinal hemorrhage– Anaesthesia in ophthalmic division of trigeminal– Horner’s syndrome
CAVERNOUS SINUS SYNDROMES
Carotico-Cavernous Fistula
Cavernous Hemangioma
Intra-Cavernous Carotid Aneurysm
Thank You