Structure and Ultrastructure of nervous tissue Flashcards Preview

MJM anatomy > Structure and Ultrastructure of nervous tissue > Flashcards

Flashcards in Structure and Ultrastructure of nervous tissue Deck (10):
1

What does the somatic nervous system supply?

skin
skeletal muscle
bone

2

What does the autonomic nervous system supply?

cardiac
smooth muscle
blood vessels
viscera
glands

3

What is myelin?

mainly lipid
insulates and increases speed of conduction

4

What is Multiple Sclerosis?

where the myelin sheaths are damaged, stain for myelin and check for a sclerotic plaque

5

How does the Nervous tissue develop?

early embryo
neurulation
dorsal ectoderm nerual plate folds to form a neural tube and releases neural crest cells which are precursors for the PNS

6

What are neurones?

highly specialised
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

7

What is a multipolar neurone?

somatic motor neurone
large cell body
one axon
many dendrites

8

What is a bipolar neurone?

sensory neurones
one dendrite, one axon

9

What is a pseudopolar neurone?

most sensory
single dendrite that bifucates close to cell body

10

What do anaxonic do?

regulate electrical hanges of adjacent neurones