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Flashcards in Nervous Tissue Deck (10):
1

Classification of neurons.

According to number of dendrites = unipolar, bipolar, multipolar.
Length of axons = Golgi I (long; tracts and peripheral nerves) , Golgi II (short; interneurons...)
Functional = sensory, motor, interneuron, neurosecretory.

2

Myelinated nerve fibres.

Thicker
Schwann at periphery
Myelin sheath = LPs, GLs...
Nodes of Ranvier.
Saltatory conduction.

3

Non-myelinated nerve fibres.

Thinner
Schwann at centre.
In the ANS
No myelin sheath.
No Nodes of Ranvier.
Continuous conduction.

4

Neuronal inclusion.

Pigment - melanin, lipofusein, iron-containing.
Trophical - lipid inclusions.

5

Morphological classification of receptors.

Encapsulated = nerve fibre+glial cell+CT capsule.
Meissner's, Vater-Pacinians's, Ruffiner's corpuscles, Krause's end bulbs, muscle spindles, Golgi tendon organs.

Non-encapsulated
1. Free endings- skin, mucosal layer of visceral organs...
2.non-free
3.tactile Merkel's cells

6

Functional classification of receptors.

According to sources of stimulus = exteroreceptors, interoreceptors, proprioreceptors

Nature of stimulus = mechanorepetors, thermareceptors, nocireceptors, chemoreceptors.

7

Classification of receptors according to sensitivity and adaptivity.

Quickly adapting

Slow adapting.
1. Type I = no spontaneous discharge, sensitive to vertical displacement
2. Type II = regular slow discharge, sensitive discharge.

8

Classification of synapses.

Types = electrical and chemical.

Direction = anterograde and retrograde

Rate = fast and slow

Functionality = excitatory and inhibitory

9

Astrocyte.

Form the blood-brain barrier, pia-glial membrane. Has Glial Fibrillar Acidic Protein.

Fibrous Type= in white matter of CNS, processes are long, unbranched, thin.

Protoplasmic= grey matter in CNS, processes are short, thick, branched. (High in GFAP)

10

Oligodendrocytes.

Interfascicular.

Satellite = associate with perkarya of spinal neurons, ANS, grey matter.