Flashcards in Nervous Tissue Deck (10):
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.
Myelinated nerve fibres.
Schwann at periphery
Myelin sheath = LPs, GLs...
Nodes of Ranvier.
Non-myelinated nerve fibres.
Schwann at centre.
In the ANS
No myelin sheath.
No Nodes of Ranvier.
Pigment - melanin, lipofusein, iron-containing.
Trophical - lipid inclusions.
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.
1. Free endings- skin, mucosal layer of visceral organs...
3.tactile Merkel's cells
Functional classification of receptors.
According to sources of stimulus = exteroreceptors, interoreceptors, proprioreceptors
Nature of stimulus = mechanorepetors, thermareceptors, nocireceptors, chemoreceptors.
Classification of receptors according to sensitivity and adaptivity.
1. Type I = no spontaneous discharge, sensitive to vertical displacement
2. Type II = regular slow discharge, sensitive discharge.
Classification of synapses.
Types = electrical and chemical.
Direction = anterograde and retrograde
Rate = fast and slow
Functionality = excitatory and inhibitory
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)