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.
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 ventricleArachnoid Mater
…. R and L jugular veins and back to heart.
3D Peel- Away of the Brain
Longitudinal fissure (green) with the “choroid plexus” of the ventricles!
Central sulcus (yellow)
precentral & postcentral gyrus
Lateral sulcus (blue)
Insula ?Lobes and Fissures
Primary motor cortex
Frontal Eye Field
Cerebrum with the “choroid plexus” of the ventricles!Primary (Somatic) Motor Cortex
Cerebrum with the “choroid plexus” of the ventricles!Premotor Cortex
synapse in thalamus & visual cortex with the “choroid plexus” of the ventricles!Preview: Brain Pathways of Vision
Example: Touch a coin in your pocket; this area would help you identify a small coin as a dime
Cerebrum with the “choroid plexus” of the ventricles!
The Medulla Oblongata