Nervous Sustem Flashcards
CT levels
Epineurium (round and between fascicles form nerve fibres)
Perineurium (fascicles)
Endoneurium (axons)
Myelin comp
Main constituent is lipid (some hist preps dissolve)
Why do nerves zigzag
Prevent n being under too much tension helps facilitate locomotion
Ganglia
Collection of n cell bodies in the periphery
Where is cerebrospinal fluid found
Central canal of spinal cord
Cells that line the fluid filled cental canal & fx
Ependymal cells (move & distribute CSF)
Classifications of nn
Multipolar
Bipolar
Unipolar
Neuroglial cells
Supporting cells
Ependymal cell
Astrocytes
Oligodendrocyte
Ependymal cell
Make up specialised epi that line spinal canal and ventricles
Astrocytes
Pack spaces between neurons, their processe & oligodendrocytes
Provide mech support
Mediate met exchange between neurones & the vascular system
Form part if blood brain barrier
Key role in repairing the CNS
Oligodendrocytes
CNS equivalent of schwann cells of PNS
Form myelin sheath in CNS
What is present in white matter
Nerve fibres
Supporting cells
No cell bodies
Whatbis present in grey matter
Nerve cell bodies
Neuropil
Supporting cells
Mixed nerve
Cont both sensory (afferebt) and motor
(Efferent) Eg median n
