CNS

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CNS

brain and spinal cord

Spinal cord

central cavity: surrounded by gray matter (unmyelinated core), external: white matter

Ventricles

spaces of the brain, connected to one another and to central canal of spinal cord, lined with ependymal cells, contain cerebrospinal fluid

2 C-shaped ventricles

2, side ventricles in the cerebral hemispheres

Third ventricle

in the diencephalon

Fourth ventricle

in the hindbrain, dorsal to pons, develops from lumen of the neural tube

Surface markings on cerebral hemispheres

ridges (gyri), shallow grooves (sulci), deep grooves (fissures)

5 lobes

frontal, parietal, occipital, temporal, insula

central sulcus on cerebral hemispheres

separates precentral gyrus of frontal lobe and postcentral gyrus of parietal lobe

longitudinal fissure

separates 2 hemispheres

transverse cerebral fissure

separates cerebrum and cerebellum

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