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.
The following is a more accessble plain text extract of the PDF sample above, taken from our Neurology Notes. Due to the challenges of extracting text from PDFs, it will have odd formatting:
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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