Card Set Information
CNS Blood supply Protection Motor Areas
CNS, Blood supply, Protection, Motor Areas
What is Grey and White Matter?
Grey - Neurons
White - Neuroglia (supporting structure), connects Grey Matter areas, largest being the Corpus Callosum
What are Astrocytes?
Anchor to capillaries
What are Microglia?
Immune System of CNS
Inflammation + Macrophages
What are Ependymal Cells?
Line brain/spine cavities
Cilia 'sweep' CSF
What are Oligodendrocites?
In white matter- Myelin Sheaths
In grey matter- buffer electrolytes
What are Neurons?
Grouped in functional areas
What embryological structure is the brain formed from?
The Neural Tube
What are the Ventricles in the brain?
4th inferior connects subarachnoid space
Continuous with one another and central canal of spinal cord
Filled with CSF
What protects the brain?
Mechanical - Cranium, meninges, CSF, BBB
Chemical - Electrolytes, nutrients, glucose, O2
What is the outermost meningeal layer and its role?
Forms Dural sinuses, collecting venous blood
What is the middle Meningeal layer and its role?
Loose brain covering
Sub Arachnoid space w/CSF, blood vessels and attachments to Pia Mater
What is the innermost meningeal layer and its role?
Tightly clings to brain
Rich in blood vessels
What is Cerebrospinal Fluid and its role?
Nutritious and oxygenated
High turn over
Formed in Choroid Plexuses via Ependymal cells
What is the Falx Cerebri?
Saggital Fold in Dura Mater
Limits Brain movement
What is Tentorium Cerebelli?
Inferior Transverse fold in Dura Mater
Divides Brain into fore and hind
Isolates Cerebellum (intratentorial)
What is the basic supply route of blood to the Forebrain?
Internal Carotid to either
Anterior Cerebral Artery - Wraps around Corpus Callosum
Middle Cerebral Artery - Frontal, Parietal, Temporal Lobes
Posterior Cerebral Artery - Midbrain, Thalamus, Optic Lobe, Corpus Callosum
What is the basic supply route of blood to the Hindbrain?
Vertebral Arteries through Foramen Magnum
Supplies Pons, Cerebellum, Middle ear
What is the basic Venous return route?
Drains to Venous Plexuses and Dural Sinuses to Internal Jugular
Superficial Veins drain into Cerebral Cortex and form Great Cerebreal Vein
What is the purpose of Sulci and Gyri?
To increase the surface area of the brain
Where are the Motor Areas located?
Primary on Posterior Frontal Lobe (Somatic)
Premotor Anterior to Primary (Habits)
Frontal Eye Field Anterior Premotor (Eyes)
Broca's Area Anterior to Premotor (Mouth/Speech)
Where are the General Sensory Areas?
Primary Somatosensory - Posterior Primary Motor Cortex (Spacial Discrimination)
Somatosensory Association - Posterior Primary SS (Temperature, Pressure, 'understanding')
Where are the Visual Areas?
Primary Visual - most posterior Occipital
Visual Association - Anterior to PS (Colour, movement, form_
Where is the Auditory area?
Located Temporally, signals from cochlear send pitch, rhythm, intensity
Where are the smell, taste and vestibular areas?
Olfactory Corticies - Frontal and temporal (conscious awareness)
Gustatory Cortex - Parietal Lobe
Vestibular Cortex - Deep Temporal
What is the Prefrontal Cortex?
Anterior portion of Frontal lobes, intellect, complex learning, recall and personality