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Organisation And Development, Csf Notes

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Lecture 2 & 3 Organisation and Development, CSF

Organisation of NS o CNS
 Brain- within skull
 Spinal cord- within vertebral column o PNS
 Cranial nerves- 12 pairs in periphery
 Spinal nerves- 31 pairs in periphery Different types of cells and their components o Neuron
 Specialised cell of NS that carries messages o Dendrites
 Receive information o Astrocytes
 Communicate with neurons and other cells
 Have processes surround blood capillaries o Oligodendrocytes
 Produce myelin o Ependymal cell
 Associated with ventricles (fluid filled spaces)
 Move CSF through ventricles o Microglial cells
 Fight infections What is a nerve in the PNS?
o Named and identifiable collection of thousands of neuronal axons bundled together o Nerves divide to smaller nerves but axons continuous o Some areas, 2 or more nerves fuse then divide to allow redistribution=PLEXUS o Specific regions there are clumps of neuronal cell bodies=GANGLIA Components of PNS o AFFERENT NEURONES
 Sensory
 Enter spinal cord through DORSAL ROOTS
 Some are SOMATOSENSORY
 Some are VISCEROSENSORY o EFFERENT NEURONES
 Motorneurones
 Leave spinal cord through VENTRAL ROOTS
 Some are SOMATOMOTOR
 Some are VISCEROMOTOR (aka ANS) Spinal nerves o Each vertebral level, pair of spinal nerves emerge o Each nerve consists of dorsal and ventral root o Primary afferent neurones in dorsal root have cell bodies in dorsal root ganglia o 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal (31 in total) ANS

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