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ventricular system

WVSOM ventricular system neuro

Where is the 4th ventricle? On the dorsal surface of the brainstem beneath the cerebellum
How does the 4th ventricle connect with the subarachnoid space? through lateral progections called foramen of Luschke, and central opening called median aperture or foramen of Magendie
What is the foramen of magendie? the median aperature of the 4th ventricle that provides communication with the subarachnoid space
What forms the roof of the 4th ventricle? superior cerebellar peduncles and superior medullary velum
How far rostrally does the 4th ventricle extend? up to the pontomesencephalic junction where it becomes continuous with the cerebral aqueduct
Where is the cerebral aqueduct? passes throughout the length of the midbrain, beneath the colliculi to end of 3rd ventricle
What is the 3rd ventricle and what makes it borders? a narrow slit like cavity, walls formed by thalamus and hypothalamus on sides, rostral border made by lamina terminalis
Where is the interventricular foramen? lies in the rostral part of ventricle
What is the function of the interventricular foramen? provides communication to lateral ventricle located within each cerebral hemisphere to the 3rd ventricle
What is the shape of the lateral ventricles? C shaped
What does the lateral ventricle consist of? anterior frontal horns, body, posterior occipital, and inferior temporal horns
The lateral ventricles contain large amount of what? choroid plexus
What is the function of choroid plexus? to make CSF
Where is CSF produced? by choroid plexus in lateral ventricles
What forms the choroid plexus? very convoluted invaginatinos of vascular pia mater into ventricular lumen
What is the function of ependymal cells in the choroid plexus? they secrete sodium in CSF
What does the choroid plexus consist of? mass of capillaries projecting into ventricles, large, thin walled and fenestrated
How is CSF secreted? active secretion of sodium ions into CSF, causing passive movement of water from choroid capillaries
How much CSF is made daily? 400-500mls, recycled 3x a day
State the circulation of CSF from choroid plexus? choroid plexus>lateral ventricle>interventricular foramen>3rd ventricle>cerebral aqueduct>4th ventricle>minority to lateral aperture, majority to median aperture>subarachnoid space>around spinal cord and brain
Where is CSF reabsorbed? venous system by passing into dural venous sinuses (mostly superior sagital sinus) through arachnoid villi
Why does reabsorption of CSF occur through arachnoid villi space? higher hydrostatic pressure in subarachnoid space than in the sinus lumen
What are the two forms of hydrocephalus? communicating and non-communicating
What is communicating hydrocephalus? impaired CSF reabsorption, obstruction of flow in SAS, or in rare cases excess CSF production
What is Non-communicating hydrocephalus? obstruction of flow within the ventricular system; common at narrow points like foramen or aqueduct
What are the symptoms of hydrocephalus? headache, nausea/ vomiting, cognitive impairment, decreased level of consciousness, papilledema, and decreased visual function
Created by: hagerman