311 Session 5 Brain circulation and CSF pathways

Identify which artery supplies blood to each area

Through which skull opening does the internal cortid artery enter

Carotid Canal

Thorugh which skull opening does the vertebral artery enter

Foramen Magnum

Identify the green labelled opening and what goes through here

Carotid canal

• Internal carotid canal

Which arteries form the circle of willis

• Anterior cerebral artery

• Anterior communicating artery

• Internal carotid artery

• Posterior cerebral artery

• Posterior communicating artery

Identify this structure

Identify this structure

Vertibral artery

What are the major branches of the internal carotid artery

Anterior cerebral artery

Middle cerebral artery

Which artery supplies blood to deep structures of the brain like the internal capsule and the basal nuclei

MCA (more specifically Lenticulostriate arteries)

Blockage to which terminal arteries would lead to no blood flow to the supplied brain area leading to an ischemic stroke

ACA

MCA

What deficits would you expect from a left ACA blockage

RIGHT leg weakness and sensory loss because ACA supplies the medial motor/sensory cortex representing the contralateral lower limb and vise versa

• CONTRALATERAL DAMAGE

What deficits would you expect from a left MCA blockage?

Right face and arm weakness and sensory loss. Language deficits may also occur if the left hemisphere is language-dominant

• CONTRALATERAL DAMAGE

A patient has weakness and sensory loss mianly in the right leg, Which artery is likely affected

Left ACA → supplies the medial cortex representing lower limb

A patient has weakness and sensory loss mianly in th eleft face and arm. Which artery is affected

Right MCA → supplies lateral cortex represnting the face and upper limb

What is the broad role of the vetebrobasilar circualtion

Provides the major arterial supply to the brainstem and cerebellum

How is the basilar artery fromed

The left and the right vertebral arteries unite at the pontomedullary junction to form the basilar artery

Where does the basilar artery travel and how does it terminate

Travels along the ventral surface of the pons and terminates as the PCA

What is the broad route of venous drainage from the brain?

Central veins →dural venous sinuses → internal jugular veins → towards the hear

What is the one major route from the superior sagittal sinus to the internal jugular vein?

Supperior sagittal sinus → confluence → transverse → sogmoid sinus → internal jugular vein

What arteries provide the longitudinal blood supply to the spinal cord?

1 anteriro spinal artery + 2 posterior spinal arteries, reinforced by segmental

What does anterior spinal artery broadly supply?

The anterior 2/3 of the spinal cord

What do the posterior spinal arteries broadly supply

Posterior 1/3 of the psinal cord

How are the spinal arteries related to the vertebral arterial system?

Anterior and posterior spinal arteries arise from the vertebral circulation and descend along the spinal cord