Blood Supply, Venous Drainage and Cranial Nerves Flashcards
what are the main 2 sources of blood supply to the brain
vertebral and internal carotid artery
what is the pathway of the vertebral artery
subclavian - vertebral - transverse foramina of C1-C6 - foramen magnum and cranial cavity
what forms the basilar artery
left and right vertebral arteries
what supplies the anterior and middle parts of brain
internal carotid artery
what does the external carotid artery supply
the meninges via the middle meningeal artery
where does the middle meningeal artery run
between the bone and the dura at the pterion
what does the circle of willis supply
anterior, middle and posterior brain
where does the circle of willis lie
around the optic chiasm and pituitary stalk
where does the basilar artery lie
over the pons
what do the posterior cerebral arteries supply
posterior brain (occipital lobe)
what do the posterior communicating arteries do
communicate with anterior and middle part of circulation in circle of willis
what does the middle cerebral artery supply
the internal capsule via small lenticular striate arteries, temporal lobe, parietal lobe, frontal lobe
what do the anterior cerebral arteries supply
medial side of the cranial hemisphere and anterior part of brain
if there is a stroke in the anterior cerebral artery supplying the front of the brain, what is affected
lower limbs, personality, cant identify objects
if there is a stroke in the middle cerebral artery supplying the temporal, parietal and frontal lobe and internal capsule, what is affected
brocas and wernickes (aphasia), face and upper limb
if there is a stroke in the posterior cerebral artery supplying the occipital lobe what is affected
vision, memory
what are dural venous sinuses
spaces between perisosteal and meningeal layers of dura mater
what occurs in the dural venous sinuses
venous drainage and CSF resorption
once the CSF circulates in the ventricles, what happens to it
goes into subarachnoid space, absorbed through arachnoid granulations and then into superior sagittal sinus
what are the main sinuses
superior sagittal sinus, sigmoid sinus, cavernous sinus, transverse sinus
where does the superior sagittal sinus run
in the falx cerebelli to the back where the falx meets the tentorium cerebelli
where does the superior sagittal sinus split at the posterior aspect of the brain
at the conference of sinuses into left and right transverse sinus
where does the transverse sinus run
within the tentorium cerebelli and along the base of the skull to drain into the jugular foramen
where does all venous drainage go
into the IJV
