1/26/2016 Microbes Infectious diseases of the brain and spinal cord are devastating Damage leads to deafness. Invisible Invaders blindness,learning disabilities,paralysis,and Amazing Allies death Blood-brain barrier protects these areas Pathogens have special Chapter 22 factors that allo them to Naegleria fowlerian Microbial Diseases of the Nervous penetrate this defense ameba(red)in human brain tissue:enters the brain via System an olfactory nerve Structure and Function of the Structure and Function of the Nervous Nervous System System Two divisions: Learning Objectives Central nervous system(CNS):brain and spinal Define central nervous system and blood- cord -Control center for the body brain barrier. Peripheral nervous system(PNS):nerves that Differentiate meningitis from branch from the CNS encephalitis. -Lines of communication in the body Meninges protect the brain and spinal cord -Three continuous membrane layers Blood-brain barrier cell membranes allow certain substances to pass but restrict others 1/26/2016 1 Invisible Invaders Amazing Allies Chapter 22 Microbial Diseases of the Nervous System • Infectious diseases of the brain and spinal cord are devastating • Damage leads to deafness, blindness, learning disabilities, paralysis, and death • Blood-brain barrier protects these areas Naegleria fowleri an ameba (red) in human brain tissue; enters the brain via an olfactory nerve • Pathogens have special factors that allow them to penetrate this defense Structure and Function of the Nervous System Learning Objectives Define central nervous system and blood– brain barrier. Differentiate meningitis from encephalitis. Structure and Function of the Nervous System Two divisions: • Central nervous system (CNS): brain and spinal cord - Control center for the body • Peripheral nervous system (PNS): nerves that branch from the CNS - Lines of communication in the body • Meninges protect the brain and spinal cord – Three continuous membrane layers • Blood–brain barrier cell membranes allow certain substances to pass but restrict others