lecture9 cns
TRANSCRIPT
DIVISION OF NERVOUS SYSTEM
CENTRAL NERVOUS SYSTEM (CNS) BRAIN
PROENCEPHALON (FOREBRAIN)
TELENCEPHALON DIENCEPHALON
MESENCEPHALON (MIDBRAIN)
RHOMBENCEPHALON (HINDBRAIN)
METENCEPHALON MYELENCEPHALON
SPINAL CORD
PERIPHERIAL NERVOUS SYSTEM (PNS) SOMATIC (SNS)
NERVES GANGLIA PLEXUSES
AUTONOMIC (ANS) NERVES GANGLIA PLEXUSES
DEVELOPMENT OFCNS
NEURAL PLATE (17th day)
NEURAL GROOVE neurulation (18-21day)
NEURAL TUBE & CREST (21st day) NEUROPORUS ANTERIOR (25th day) NEUROPORUS POSTERIOR (28th day)
CEREBRUM-CORTEX
NEOCORTEX (Cerebral hemisheres) 6 layers perception, association, reacting
PALEOCORTEX (Olfactory cortex) 3 layers smell perception, stereotypical
sexual behaviour
ARCHICORTEX (Hippocampus) 2-4 layers learning, memorizing
GENERAL ORGANIZATION OF CNS
GRAY MATTER NEURON BODIES DENDRITES INITIAL SEGMENT OF
AXON (UNMIELINATED) PROTOPLASMATIC AND
FIBROUS ASTROCYTES MICROGLIA CAPILARES
WHITE MATTER MIELINATED AXONS OLIGODENDROCYTES FIBROUS ASTROCYTES MICROGLIA CAPILARES NO ANY NEURON
BODIES!
GRAY&WHITE MATTER LOCALISTAION
GRAY CORTEX OF
CEREBRUM AND CEREBELLUM
BASAL NUCLEI, THALMUS, HYPOTHALMUS
HORNS AND GRAY COMISSURES OF SPINAL CORD
WHITE TRACTS FUNICULES OF SPINAL
CORD
CSF - SECRETION
CHOROID PLEXUS LATERAL, 3-rd AND
4-th VENTRICULES losse connective tissue
(pia mater) fenestrated capillares
EPENDYMAL CELLS cuboidal / collumnar ion-transporting
CSF
VOLUMEN 135mlDAILY SECRETION 550mlFILS VENTRICLES, CENTRAL CANAL, SUBARACHNOIDAL AND PERIVASCULAR SPACE
FUNCTION ENVELOPES CNS WITH
HYDROSTATIC COAT QUICK REGULATION
OF ICP (INTRACRANIAL PREASURE)
BBB
ENDOTHELIAL CELLS TIGHT JUNCTIONS ENZYMATIC SYSTEMS
BASAL MEMBRANE
PERIVASCULAR SPACE MACROPGAGES AND
MICROGLIA
PERIVASCULAR GLIA MEMBRANE FOOT-LIKE PROCESSES
OF ASTROCYTES