1. Histology of the Nervous Tissue

2. nervous system overview
Monitors and processes sensory information from the environment and from within the body
Principal cell populations
Neuron - transmits impulses
Neuroglia - Support, protects and insulates the nervous tissue

3. Neural tissue location
Central Nervous Tissue
Brain
Spinal cord
Peripheral Nervous Tissue
Nerves

4. NEURONS AND NEUROGLIAS

5. The Anatomy of a Neuron

6. Neuron structure Nissl bodies – clusters of RER and ribosomes
Dendrites
Receptive region
Axon or nerve fiber
Nerve impulse generator and transmitter
Axon hillock
Axon terminal or synaptic knobs
Collaterals with telodendria

7. Neuron structure Synaptic terminals Presynaptic membrane
Synaptic vesicles
neurotransmitter
Synaptic cleft
Postsynaptic membrane

9. Gray Matter
Clusters of cell bodies, dendrites, unmyelinated axons and neuroglias are called:
Nuclei if they are located in the CNS
Ganglia if they are located in the PNS

10. White Matter Oligodendrocytes in the CNS
Axons are covered by myelin insulation
Fatty material secreted by:
Schwann cells in the PNS
Oligodendrocytes in the CNS

12. Axons or Nerve Fibers Myelinated axons are called: Nodes of Ranvier
Tract if they are located in the CNS
Nerve if they are located in the PNS
Nodes of Ranvier
Gaps between myelin sheath

13. Neuron classification
Anatomical or structural
Unipolar
Bipolar
Multipolar

14. A Structural Classification of Neurons

15. Neuron classification
Functional
Sensory neurons or afferent neurons
deliver information from the body to the CNS
Typically unipolar or bipolar
Body found in a ganglia (PNS)

16. Neuron classification
Motor neurons or efferent neurons
Carry impulse from the CNS to the body
Typically multipolar
Body found in the CNS
Association (interneuron) neuron
Found between and sensory and a motor neuron

17. Structure of a nerve Definition
Bundle of fibers wrapped in myelin and connective tissue
Located in the PNS
Classification
Sensory or afferent – going to the CNS
Motor or efferent- going to the body
Mixed – carry sensory and motor fibers

18. Structure of a nerve
The connective tissue that surrounds the fiber is called
Endoneurium-covers each nerve fiber
Perineurium – covers a bundle of nerve fibers
The whole bundle is called fascicle
Epineurium – covers the whole nerve

20. Electroencephalography

21. Electroencephalography - EEG
Measures brain activity
Alpha waves = awake with eyes closed. Resting.
Alpha block
Beta waves = awake with eyes opened. Alert.
Delta waves = normal during sleep
Theta waves = normal children, abnormal in adults