Organisation And Development, Csf Notes
This is a sample of our (approximately) 4 page long Organisation And Development, Csf notes, which we sell as part of the Neurology Notes collection, a 70-80% package written at Bristol University in 2012 that contains (approximately) 117 pages of notes across 36 different documents.
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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
Enter spinal cord through DORSAL ROOTS
Some are SOMATOSENSORY
Some are VISCEROSENSORY o EFFERENT NEURONES
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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