cranial cavity 1 Flashcards by Omar Gazar

بسم الله الرحمن الرحيم وبه نستعين
Cranial caity is divedid into ?

Anterior middle posterior cRANIAL fossae

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…..separates the Ant from middle cranial fossa ?

Lesser wing of sphenoid

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….Separates the middle from inferior cranial fossae ?

Petros part ot temporal bone

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Pituitary fossa is,,,,,,,,,,, involve,,,,,,, ?

Shpenoid body for Pituitary gland

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Foramen magnum is passed by ?

Brainstem

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Mention meningeal membranes

Dura
Arachanoid
pia

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Describe pia

Meningieal memberane
Thin delicate investing brain and follwoing its Contour by entering Fissures and grooves

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describe arachanoid

Thin avascular
from its inner surface subarahcnoid extensions projects to the pia

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Describe Dura

Thick Outer meninigel membrane formed of 2 layers
Outerendosteal + inner memengial
They are fused together excpet for areas for forming
Dural Folds + Dural Venous Sinuses

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spaces in meninges

Sub-dural between dural and Arachanoid
Sub Arachanoid between Arachanoid and pia

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Mention Dural folds

Falx cerebri +cerebelli
Tentorium Cerebelli
Diapharamatic sellae

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Describe dural folds in general

Partition like processes separating parts of brain and Stabilizing them during movment
Formed by duplication of Meningal dural fold

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Covers Pituitary by covering Shpenoid body ?

Diapharagmgatic sellae

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Describe falx cerebri

Cresntric
Vertical downwards
between 2 cereberal hemispheres in medial longitudinal fissure till corpus callosum
Apex Conncted to :
1-Frontal Crest
2-Crista galle
Base to ? Tentorium cerebelli

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Falx cerebri boundaries

apex to frontal crest +crista galle
base to tentorium cerebelli
Upper margin to supperio sagital sinus margins
lower margin free
Right and lateral sufraces

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Falx cerebri is connected to ? under surface of skull cap ?

Margins of superior sagital sinus

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Mention sinuses enclosed by margins of falx cerebri

Upper margins Superior sagital sinus
Lower margin Inferior sagital sinus
Base Straight sinus

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Free margin of tentorium cerebelli is fixated by ?

Anterior clenoid processes making ?
sphenio tentorial notch

Attached margin of tentorium cerebelli is attached to ?>

Posterior Clenoid processes
upper part of petrous bone
lips of transverse Sinus

Describe falx cerebelli …. .

Posterior cranial fossa
Crescntric
vertical downwards
between 2 cerebellar hemispheres
Boundaries :
Base to Tentorium Cereblli
apex to margins of Foramen Magnum
Rt and Lt surfaces to? Cerebellum
Anterior free
Posterior : Internal Occipital Crest

Point of Crossing ? what is it

Point of Crossing of attached and free margins of Tentorium Cerebelli
The Occlumotor pass anterior to it
The Trochlear Corss it !

Venous sinuses Related to tentorium Cerebelli Mention

Superior Petrosal
Transverse
Straight sinuses

Describe Tentorium Cerebelli

Posterior Cranial Fossa
Horizontal Tent
Between Cerebral and Cerebellar Hemispheres

Clenoid process give attachment to ?

Tentorium cerebellI
Diapharagmtic sellae

Describe Diapharagmatic sellae

Small dural fold Between 4 Clenoid Processes covering Hypophyseal fossa and has central opening for ? Infinibulum of Pituitary gland

Blood supply to dural folds

Anterior Fossa: Opthalmic + Middle Menigneal Middle Fossa: Middle+ Accessory Meningeal Posterior Fossa ? Occipital +Ascending Pharyngeal + Vertebral

Nerve supply to Dural Folds ?

3 branches of trigeminal + 3 upper cervical Anterior Fossa : Anterior ethmoidal + Maxillary Middle Fossa: Maxillary + Mandibular Posterior Fossa ? c1+C2+C3 CN10+12

Dural venous sinuses show

Venous channels lined by endothelium between 2 dural layers with no muscles or valves Draining Brain Meninges CSF bones

Connecting IntraCranial with ExtraCrania lis ?

Emissary veins

Mention dural venous

Paired: Sphenopariteal Cavernous Superior petrosal transvers inferior petrosal sigmoid ____________________ Single : Superior Sagittal sinus inferior sagittal sinus Occipital -Straigth sinisuse ____________________ multiple : IntraCavernous sinuses Basiilar pleux

Occipital sinus found at area of ?

Internal occipital Crest

نهاية sss ISS

At right : SSS to right transves to Right sigmoid to Right IJV At left : ISS to straight sinus to left transverse to left sigmoid to Left IJV

Cavernous sinus drains into ?

-Superior petrosal to transvers ... - Inferior Petrosal to sigmoid ....

Confluence of sinus at? Involving ?

At internal occipital protuberance Superior sagittal sinus Straight Occipital Transverse

Cavernous sinus describe

Spongy sinus in middle cranial fossa On either side of Body of SHpenoid (pituitary fossa ) ant : medial end of orbital fissue post: apex of petrous temporal

Relations of Cavernous sinus

Superior : Optic Tract + Internal carotid artery Inferior : foramne lacerum Medially: Pituitary + Shpenoidal Air sinus Lateral : Temporal + Trigimenal __________________aant : sup oribtal fissure and apex of orbit post : apex of petrous temporal + Crus cerebri of mid brain

Structures runinig in medial and lateral wall of cavernous sinus ?

Lateral ": Occlumotor + Trochlear Opthalamic + Maxillary ___________________ Medial : Internal carotid artery and infrolatral to it is ? Abducent nerve

Tribuitaries of Cavernous Sinus are?

Superior opthalmic vein Spheniopariteal vein 2S Frontal MMV middle meningeal Cerebral veins :- superfical-middle-inferior cerebral veins Veins from pituitary gland

Cavernous sinus drains into ?

Superior petrosal to Transvers inferior petrosal to Sigmoid

Communiations of Cavernous sinus ?

-SOV -Pterygoid venous pleux via emissary veins -intracavernous sinuses Bidirectional cmmounictions no valve

clincal imp of Cavernous sinus >?

Infection spreads to it via dangerous area of face affecting 346 cranial nerves may cause chemosis or abducent palsy

الحمدلله رب العالمين

dilated posterior end oF SSS is called

Confluence of Siueses

Tribuitaries of SSS ?

superior cerebral veins Arahnoi villi and granulations into sinus and 3 lacunae dilatations on each side