Transcript 07 - nervous tissue - (Part 2 of 3).ppt

Meylination of peripheral nerve
Peripheral Nerve
(T.S)
Peripheral Nerve
(L.S)
TS.peripheral nerve-H&E
TS.peripheral nerve-osmic acid
Neuroglia cells
• Non-neuronal cells
• Ten times more in number than the neurons
• Derived from ectoderm (neuroepithelium) except
the microglia which are derived from blood cellmonocyte
• They:
 Provide support, protection and nutrition for
neurons
 Maintain homeostasis
 Form myelin
• Form gap junctions with other neuroglia cells
Neuroglia cells cont’d
• They include:
 Astrocyte
 Microglia
 Oligodendrocytes
 Ependymal cells
 Schwann cells
 Stellate cells
Most of them are located •
in CNS, Schwann cells
and stellate cells are
present in PNS