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CNS Support Structures

Across
Cavities that are filled with cerebrospinal fluid and communicate with each other and with the spinal cord canal
Internal carotid arteries arise off of common carotids and branch to form anterior and middle cerebral arteries; supplies a large area of brain and many deep structures
Delicate, vascular membrane
Located posterior and deep between the two thalami; cerebral aqueduct communicates with the 4th ventricle
Formed by arachnoid and pia mater, contains cerebrospinal fluid and cisterns, major arteries
Vertebral arteries aries off of subclavian arteries and unite to form the basilar artery; this vessel bifurcates into 2 posterior cerebral arteries; supplies the brain stem, cerebellum, occipital lobe, and parts of thalamus
Formed by anterior communicating artery connecting the 2 anterior cerebral arteries and the posterior communicating artery connecting each posterior and middle cerebral artery
Large, irregularly shaped, with frontal, occipital, and temporal horns, communicates with 3rd ventricle through foramen of Monro
Thin vascular membrane that covers the brain surface; forms tela choroidea of ventricles
Down
The selective restriction of blood borne substances from entering the CNS; associated with capillary endothelial cells
Three membranes that envelop the brain
Includes cerebral veins, dural venous sinuses
ridged bony chamber that contains the brain and facial skeleton, with an opening (foramen magnum) at its base
Provides mechanical support, controls brain excitability by regulating ionic composition, aids in exchange of nutrients waste products
Outer, tough, fibrous membrane attached to inner surface of cranium; forms falx and tentorium
Brain is 2% of body weight with circulation of 18% of total blood volume
Pyramid shaped cavity located in pons and medulla; foramina of Luschka and Magendia communicate with subarachnoid space