Support Systems Flashcards
What are the 2 fluid systems that support the neurons and glial cells and overall function of the nervous system?
- Cerebrospinal fluid (CSF) system
- Vascular system
Where is CSF primarily formed?
in the ventricles
Where does CSF circulate before it is absorbed into the venous circulation?
through the ventricles and into the subarachnoid space
What are the 3 meninges that cover the brain and spinal cord?
- Dura mater
- Arachnoid
- Pia mater
Most CSF is secreted by ________ in the ventricles, however some CSF is formed by _______ leaking into the ventricles.
choroid plexuses
extracellular fluid
Describe the path in which CSF flows
1) From lateral ventricles into the third ventricle (via the interventricular foramina)
2) From the third ventricle into the fourth ventricle (via the cerebral aqueduct)
3) From the fourth ventricle into the subarachnoid space (via the lateral and medial foramina)
4) It then flows around the brain and spinal cord until it is reabsorbed into the venous sinuses
What are 3 common disorders of the CSF system?
- Epidural and subdural hematomas
- Hydrocephalus
- Meningitis
What is CVA synonymous with?
stroke
A CVA can be classified by what 3 things?
- pattern of progression
- etiology/cause
- arterial location
What are the 3 patterns of progression?
- Transient ischemic attack
- Completed stroke
- Progressive stroke
What is a TIA?
A brief, focal loss of brain function with a full recovery from neurologic deficits within 24 hours
What is a completed stroke?
neurologic deficits from vascular disorders that persist more than 1 day and are stable
When does a brain infarction occur?
when an embolus or thrombus lodges in a vessel, obstructing the blood flow
Obstructions of blood flow in small, deep arteries result in _____ infarcts
lacunar
Brain infarcts cause __% of strokes.
80
