Fluid And Blood Supply To Brain Flashcards
Ventricles
Lateral ventricles - looks like ram horns from front
Third ventricle - near the midbrain and empties into aqueduct
Cerebral aqueduct - connect three to four
Fourth Ventricle - Empties into subarachnoid space
Spinal cord has central canal
Choroid Plexus
Continuously produces CSF
CSF serves as shock absorber, nutrient and waste transport/removal, maintains ion balance in neural tissue
CSF circulation and drainage
Lateral ventricle-third ventricle-cerebral aqueduct-fourth ventricle-subarachnoid space/central canal-arachnoid granulations-dural venous sinus
Enters subarachnoid space from median and lateral apertures
Choroid plexus production = arachnoid granulations reabsorb and return CSF to venous system
Hydrocephalus
Caused by obstruction of circulation
Accumulation in fluid
Brain compression
Blood supply to brain
Vertebral arteries
Branches off the sublclavian arteries-travels though transverse foramina and enter skull through foramen magnum
Branches referred to as posterior circulation of the brain
Internal carotid arteries
Branches off common carotid arteries- enters through carotid canal
Anterior circulation of the brain
Internal carotid artery
Anterior cerebral artery
Middle cerebral artery
Posterior communicating artery
Vertebral Artery
Posterior circulation of the brain
Basilar artery
Cerebellar artery
Posterior Cerebral artery
Circle of Willis
Anterior communicating artery
Anterior cerebral artery
Internal carotid artery
Posterior communicating artery
Posterior cerebral artery
Flow of arterial supply
Internal carotid enters and splits into anterior and posterior communicating arteries, anterior empties into anterior cerebral, posterior empties into posterior cerebral and empty into basilar and splits into vertebral artery.
Posterior supplies brain stem and cerebellum
Anterior supplies most of cerebrum
