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Meninges, CSF, Circulation

Anatomy Exam 6
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Meninges of the brain?
Dura mater, arachnoid mater, pia mater
Where is CSF found?
Subarachnoid space (between arachnoid and pia) and within ventricles
Two layers of dura mater?
Periosteal (bone side) and meningeal (brain side)
Which layer of dura mater can form dural folds?
Meningeal
Dural fold
folds in dura mater (meningeal) between fissures
Name three dural folds
Falx cerebri, falx cerebelli, tentorium
Falx cerebri
Along longitudinal fissure; between the cerebral hemispheres
Falx cerebelli
Along cerebellar notch; between cerebellar hemispheres
Tentorium
Along horizontal fissure; between cerebrum and cerebellum
What is CSF?
Cerebrospinal fluid; similar to blood plasma
Functions of CSF
insulation/protection, metabolic waste removal, hormone transport
Brain ventricles
spaces within the brain filled with CSF
Choroid plexus
contained in ventricles; produces CSF
Name the 4 ventricles
2 lateral (cerebrum), 3rd (diencephalon), 4th (brainstem)
What is a special feature of the fourth ventricle?
apertures
Apertures
connections from fourth ventricle to subarachnoid space (allow CSF to flow into this space)
Path of CSF
choroid plexus, ventricles (first and second to third to fourth), apertures, subarachnoid space, arachnoid villi, dural sinuses, bloodstream
Arachnoid villi
transport points where CSF flows from subarachnoid space into dural sinuses
Dural sinuses
vein-like structures that drain fluid from brain into venous system
How do dural sinuses differ from veins?
No smooth muscle nor valves
What does vertebral artery supply?
Cervical spinal cord and posterior brain
Vertebral artery branches off of what?
Subclavian artery
What does internal carotid artery supply?
Anterior brain
Internal carotid artery branches off of what?
Common carotid artery
What do branches from basilar artery supply?
Cerebellum and pons
What do branches from circle of Willis supply?
Cerebrum
What arteries make up circle of Willis?
Anterior and posterior communicating arteries
Dural sinuses pathway to venous system
Cavernous and superior sagittal and inferior sagittal, transverse, sigmoid
Sigmoid sinus becomes which vein?
Internal jugular vein
Venous pathway
Internal jugular vein, brachiocephalic trunk, superior vena cava