neuro 2 - CNS circulation Flashcards
the ventricular system
a set of interconnected spaces/cavities that circulate cerebrospinal fluid
CSF is made by
choroid plexus
choroid plexus is found
in the lateral 3rd and 4th ventricles
CSF flow pathway
choroid plexus > lateral ventricle > intraventircular foramen (foramen on monro) > 3rd ventricle > cerebral aqueduct > 4th ventricle >
CSF leaves via the 2 lateral formamina (formaina of lushka) and 1 median aperture (foramen of magendie) of 4th ventricle and enter subarachnoid space
most CSF exits through
the median aperture > cistern magna (between cerebellum and medulla)
CSF reabsorbed mostly at the
superior sagittal sinus vis arachnoid villi
the arachnoid villi with age
become hypertrophic and are called granulations
hydrcephalus
an obstructin of CSF within the ventricular system
2 types of hydrocephalus
communicating (nonobstructive) and non-communicating (obstructive)
communicating hydrocephalus
impaired CSF rreabsorption w/o obstruction of CSF flw between the ventricles and subarachnoid space
non comunicaating obstruction of CSF
there is an obstruction in the ventricular system
notable side effect f non cmmunicatng obstructioon of CSF
chiari malformation
downward displacement of cerebellum through foramen magnum
chiari malformation
downward displacement of cerebellum through foramen magnum
the brain is supplied by
internal carotid arteries and vertebral arteries
the carotids give rise t
give rise to many branches
the carotids terminate
into the anterior and middle cerebral arteries
the vertebral arteries converge at
the medulla/pons to create the basillar artery
the basillary artery gives rise to
several arteries before it terminates into the superior cerebellar arteries and the posterior cerebral arteries
the vertebral and corotid arteries are linked by
cerebral arterial circle (circle of willis)
the circle of willis encircles the
optic chiasma
anterior cerebral artery stroke symptoms
loss of smell (anosmia) - olfactory bulb and tract
weakness or paralysis of lower limb - motor cortex
middle cerebral artery stroke symptoms
speech impairments/aphasia - broca’s and wernicke’s
weakness or paralysis of the face and upper limb - motor cortex
posterior cerebral artery stroke symptoms
cortical blindness - occipital lobe face blindness (prospagnosia) - temporal lobe
what are the main branches which supply the cerebral cortex
the anterior, middle and posterior cerebral artery
prosopagnosia
face blindness
