Organisation And Development, Csf Notes

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This is an extract of our Organisation And Development, Csf document, which we sell as part of our Neurology Notes collection written by the top tier of Bristol University students.

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Lecture 2 & 3 Organisation and Development, CSF

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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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