Topic 14 - Nervous Tissue Flashcards
What is nervous tissue composed of?
Nerve Cells, Glial Cells.
The CNS includes…
The brain and spinal cord
Which neurones don’t posses myelin sheathes?
Grey Matter
Which membrane protects the entire CNS?
Meninges
What is included in the PNS?
Cranial and spinal nerves.
Associative roots and ganglia
Give 4 classifications of neurone.
Unipolar
Pseodounipolar
Bipolar
Multipolar
Give 3 types of neurone
Purkinje, Cortical pyramidal, Motor
Describe an excitatory neurone
Spiny dendrite, axon makes asymmetrical synapses using excitatory neurotransmitters
Where are proteins made in the neurone?
The cytoplasm
Where are signals received in the neurone?
The Dendrites
Where does the axon originate from on the nerve body?
The Axon Hillock
90% of nervous system cells are…
Glial Cells (Neuroglia)
Which glial cells are found in the CNS?
Ependymal, Astrocytes, Oligodendrocytes, Microglia
Which glial cells are found in the PNS?
Neurolemmocytes
What are neurotransmitters usually composed of?
Amines, purines, acetyl choline
Which types of synapse are there?
Electrical: Gap Junction
Chemical: Membrane potential changes, releasing neurotransmitter molecules.
Types of chemical synapse
Axo-dendritic, Axo-somatic, Axo-spinous
What are chemical synapse categories determined by?
Their function: Excitator and inhibitory
A nerve is composed of ….’s of axons.
1000
Nerves are … to make signals quicker.
Myelinated
