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tjminnie
on FreezingBlue Flashcards.
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Where is the dura mater, composition?
- Outermost meningeal layer
- composed of dense collagenous connective tissue
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Where and what is the arachnoid?
- intermediate meningeal layer
- formed by delicate fibers of CT forming web-like pattern
- Filled with CSF
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What is the function of the arachnoid granulations
structures that reabsorb CSF from the ventricular circulation into the venous system
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What and where is the pia mater? Vascularization (Y/N)?
- Innermost meningeal layer
- consists of a thin membrane that adheres to underlying neural tissue
- highly vascularized
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Where is the epidural? What is found there?
between the dura mater and cranial endosteum. Mengeal vessels found here
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Where is the subdural space? What is found there?
- Between the dura mater and the arachnoid
- bridging veins that drain into dural venous sinuses are found in this layer
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Where is the subarachnoid space? what is it's function
- Between arachnoid and pia
- filled with CSF
- major cerebral arteries travel in this space sending penetrating branches to the pia
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What is the function of the falx cerebri?
2-fold dura that separates the 2 cerebral hemispheres
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What is the tentorium cerebelli?
- 2-fold dura that separate the posterior cerebrum from the cerebellum;
- cerebellar roof
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What does the superior sagittal sinus recieve? Run? Location?
- Receives contribution from cortical veins
- runts ANT-> POST
- located on the mid-saggital plane deep to the calvaria
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What does the inferior safittal sinus drain?
- drains the deep/medial cerebral hemispheres
- drains into the straight sinus
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What does the cortical veins drain and drain into?
Drains the cerebral cortex and drains into the superior sagittal sinus
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What does the straight sinus due and drain into and finish at?
- Joins the superior and inferior sinuses
- drains into the transverse sinus --> drains into the internal jugular vein
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What is the function of the confluence of sinuses
Point of convergence of the Straight, Superior, Sagittal, and Occipital Sinuses.
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What is the function and location of choroid plexuses?
- Network of capillaries (choroid epithelial cells) that synthesize CSF.
- Located in all ventricles
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What is the lateral ventricles developed from, structure, location?
- Developed from neural tube expansion
- Located deep into the cerebral cortex
- filed with CSF
- 3 horns named after the lobes they expan into.
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What connects the lateral ventricles with the 3rd ventricle?
The interventricular foramina of Monro
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What forms the walls of the 3rd ventricle?
Thalami and hypothalamus
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What is the interthalamic adhesion?
Foramen in the 3rd ventricle filled with the connection between the 2 thalami
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What is the passage between the 3rd and 4th ventricles?
Cerebral aqueduct (no choroid plexi here)
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Where is the 4th ventricle found? continuous with? Foramina do what?
- Found between the cerebellum and brainstem
- Multiple foramina that allow CSF into subarachnoid space
- continuous INF with central canal in closed medulla and spinal cord.
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Where is the foramina of lushka? how many?
2 foramina off of lateral recess of 4th ventricle
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Where is the foramen of megendie?
It is off the POST 4th ventricle
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What is the ventricular division found in the lower medulla and spinal cord?
Central cord.
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What is the internal carotid artery a branch of? Bifucations go to what?
- Branch of common carotid
- bifuractes into MCA and ACA at circle of willis
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How does the middle cerebral artery arise? Branches?
- Continuation of the internal carotid artery.
- bifurcates into superior and inferior division
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What does the middle cerebral artery supply?
lateral aspect of the cerebral hemispheres, superior and inferior sylvian sulcus
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What is the start and supply of the anterior cerebral artery?
- continuation of internal carotid
- supplies the cerebral cortex on the ANT MED surface, from the frontal to the anterior parietal lobes.
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What is the function of the anterior communication artery:
communicates withe both ACAs
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What is the function of the POST COMM artery
communicates the internal carotid with the PCA on the same side.
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What is the supply of the posterior cerebral artery? formed by?
- Formed by basilar artery where it bifurcates
- supplies the INF and MED temporal lobes and occipital cortex
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What is the supply of the superior cerebellar artery? What can it cause?
- Supplies superior cerebellum and midbrain
- Potentially can cause trigeminal neuralgia
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What forms the basilar artery? location?
- Located in ANT Pons
- Formed by the junction of the 2 vertebral arteries.
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What are the horrizontal branches of the basilar artery? What does it supply
- Pontine fibers
- supplies the ANT pons
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What does the ANT INF cerebellar artery arise from? Make connections with?
- Arises from basilar artery
- anastomoses with the PICA
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What does the AICA supply? Pathology with it?
- supplies the anterior cerebellum
- Lateral pontine syndrome
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What does the PICA arise from, anastomose with?
- Arises from vertebral artery
- anastomoses with AICA
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What is the supply and pathology of the PICA?
- Supplies the postero-inferior surface of he cerebellum
- Pathology - Wallenberg's syndrome
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Where do the vertebral arteries come from and form?
- Branches of the subclavian arteries
- converge to form the basilar artery
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ASA supplies? branches from?
- supplies anterior spinal cord
- branches of the vertebral arteries.
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