Ventricles (Task 3) Flashcards
Connection between 3rd and 4th ventricle
Cerebral Aquaduct
Connection between lateral ventricles and 3rd ventricle
Interventricular foramina
Communications of the 4th ventricle
Central canal of spine
Subarachnoid space
Cells which make CSF
Ependymal cells in choroid plexus of ventricles
Reabsorption of CSF
Enter dural venus sinsuses via arachnoid granulations (aka arachnoid villi) of arachnoid mater
Role of CSF
Buoyancy of brain so we can support weight of head Protection of brain Prevention of ischaemi Homeostasis Waste clearence
Symptoms of occluded cerebral aqauduct in a neonate
Hydrocephalus
Bulging fontanelles
Enlarged head
Gaping cranial sutures
Symptoms of occluded cerebral aqauduct in an adult
Hydrocephalus
Raised ICP symptoms
Blood in CSF sample may signify
Subarachnoid haemorrhage
Traumatic LP
LP contraindications
GCS < 9 Bradycardia and Hypertension Coagulopathy Shock Repeated seizures Focal neurological symptoms Papillioedema
Reason for LP contraindication in raised ICP
LP causes a low pressure shunt which can pull brain down and cause herniation
Mechanism of a subfalcine herniation
Brain tissue pushed under falx cerebri
Mechanism of transtentorial (uncal) herniation
Uncas of temporal lobe is squeezed putting pressure on brainstem
Mechanism of a transtentorial (central) herniation
Diencephalon and parts of temporal lobe pushed through tentorial notch
Tonsiller herniation
Cerebellum pushed through foramen magunum