Neural Tissue PPT
Made up of neurons and neuroglia cells
Functional Overview of NS
Two cell types:
structural framework & repairs
regulation of ions, nutrients, gases
Smaller than astrocyte
Produce myelin in CNS (white matter vs. gray matter!)
Myelin = ?
Lining of ventricles & central canal
Some regions ciliated
Some specialized to produce CSF
Schwann Cells and Peripheral Axons
Responsible for myelination, but surround all peripheral axons!
Involved in repair mechanism after injury Wallerian Degeneration
Structural Neuron Classification
Also called pseudounipolar
Rare, but important in special senses
All motor neurons
Functional Neuron Classification
1) somatic vs. visceral sensory or afferent monitoring of ?
2) somatic vs. visceral motor or efferent carry instructions to ?
3) Inter- or association neurons
Site of communication between two nerve cells or nerve cell and effector cell
neuro-effector junctions (example?)
Electrical vs. chemical synapses
Chem. Synapse Structure
Anatomical Organizatin of NS
Collections of cell bodies – ganglion in PNS, center or nucleus in CNS
Bundles of axons – tracts in CNS, nerves in PNS
“White” = myelinated axons, both nerves and tracts
“Gray” = non-myelinated material, dendrites, synapses and cell bodies as well as nonmyelinated axons. In CNS – nucleus; in PNS – ganglia