exam 4 CH 13 CNS

CNS

• brain and spinal cord

brain development

• happens very quickly

adults have 4 regions

• cerebrum

• diencephalon

• brain stem

• cerebellum

brain organization

• gray matter: lacking myelinated fibers, short (synapse communication)

• white matter: myelinated axons (propagation of a sig)

spinal cord

• outer white matter

• inner gray matter

cerebrum

• cerebral cortex outer: gray matter

• inner white matter

• deep basal nuclei: gray matter

ventricular system of brain

• fluid-filled chambers that go all the way to central canal of spinal cord

• filled w CSF

• ependymal cells (neuroglial cells) line the ventricles in CNS

• paired lateral ventricles(primary loco for CSF prod.) are connected to the 3rd ventricle via the interventricular foramen

• 3rd ventricle is connected to 4th ventricle via cerebral aqueduct

cerebrum

• 2 hemispheres

• gyri: ridge

• sucli: shallow grooves