Lecture 3 Flashcards
Circulation to the Brain and Spinal Cord: CSF and Vascular Systems
What are the 2 fluid systems in NS?
Cerebrospinal fluid (CSF)
Vascular
Where is CSF formed? and where does it flow?
Formed: Choroid plexus
Flow: between ventricles & into subarachnoid space and then is absorbed back into venous system
What does CSF help with?
nutrients, removing waste products
CSF and meninges provide what function?
shock absorption to brain when head is hit
how many ventricles do we have?
2 C-shaped lateral ventricles
3rd ventricle
4th ventricle
placement of lateral ventricles: (lateral wall, below/above body)
Lateral wall - caudate nucleus
Below body - thalamus
Above body - corpus callosum
Lateral ventricles connect to each other and the 3rd ventricle by
Interventricular Foramina (Foramina of Monro)
Where is 3rd ventricle?
- narrow in midline of diencephalon
- surrounded by thalamus and hypothalamus
what connects 3rd and 4th ventricle through the midbrain?
Cerebral aqueduct (aqueduct of Sylvius)
where is the 4th ventricle?
posterior to pons/medulla and anterior to cerebellum
Where does the 4th ventricle connect and drain into?
- connects to central canal of SC
- drains into the subarachnoid space
The 4th ventricle drain into the spinal canal through which pathway?
2 lateral foramina (foramina of Luschka/lateral aperture) and midline foramen of Magendie (medial aperture)
What are the 3 meninges?
- Dura mater
- Arachnoid mater
- Pia mater
What is the outer and the inner dura mater layer attached to?
- outer layer is firmly attached to inside of skull
- inner layer is attached to arachnoid
The inner and outer dura mater layers are fused except:
at dural sinuses which collect CSF and venous blood
two dense projections of inner dura layer:
- Falx cerebri
- Tentorium cerebelli
and then continues as spinal dura
which layer has vili/granulations that go through dura into venous sinuses to allow CSF flow into them?
arachnoid mater
which layer is tightly fixed to the brain and SC surfaces?
Pia mater
what is pia mater connected to?
arachnoid through arachnoid trabeculae (collagen fibers) to allow suspension of brain in CSF
what secretes the most CSF?
Choroid plexuses
formation of CSF includes:
a web of capillaries embedded in connective tissue and epithelial cells
What is CSF and what is it composed of?
CSF is a protein rich substance.
Blood is filtered and transported through these layers to form CSF
Color palate for CSF health
yellowish - infection
bright red - active hemorrhage
maroon red - venous blood
What disorder is caused by quick accumulation of blood in a characteristic “lens” shaped accumulation?
Epidural Hematoma
