Flashcards in Structure and Ultrastructure of nervous tissue Deck (10):
What does the somatic nervous system supply?
What does the autonomic nervous system supply?
What is myelin?
insulates and increases speed of conduction
What is Multiple Sclerosis?
where the myelin sheaths are damaged, stain for myelin and check for a sclerotic plaque
How does the Nervous tissue develop?
dorsal ectoderm nerual plate folds to form a neural tube and releases neural crest cells which are precursors for the PNS
What are neurones?
receive, integrate and transmit electrochemical impulses
- have a perikaryon (cell body)
this contains nucleus, most organelles, synthetic centre for neuron, cytoplasm with highly developed RER called NISSL BODIES which actively produces cytoskeletal proteins and proteins for transport and secretion
- lots of mitochondria
AXON, fine cylindrical process, plasma membrane is called the axolemma and specialised to generate and conduct nerve impulses to other cells
- dendrites, EXTEND FROM PERIKARYON, receive stimuli from other neurones at synapses
What is a multipolar neurone?
somatic motor neurone
large cell body
What is a bipolar neurone?
one dendrite, one axon
What is a pseudopolar neurone?
single dendrite that bifucates close to cell body