Principal Parts of the Brain. Cerebrum Diencephalon thalamus hypothalamus Cerebellum Brainstem midbrain pons medulla. Brain – midsagital section (photograph). Largest organ in the body at almost 3 lb. Brain functions in sensations, memory, emotions, decision making, behavior.
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Arachnoid villi reabsorb CSF.
Why all this !$^%&*! trouble?
Reabsorption rate = Production rate
middle meningeal layer isseparated from dura mater bythe “subdural space”
between arachnoid mater and pia mater
CSF and large blood vessels
web-like extensions span the space and secure it to the underlying pia mater
CSF gets into the subarachnoid space from 3 foramina (openings) in the roof of the 4th ventricle
…. R and L jugular veins and back to heart.
3D Peel- Away of the Brain
Longitudinal fissure (green)
Central sulcus (yellow)
precentral & postcentral gyrus
Lateral sulcus (blue)
Primary motor cortex
Frontal Eye Field
synapse in thalamus & visual cortex
Example: Touch a coin in your pocket; this area would help you identify a small coin as a dime
The Medulla Oblongata