Nervous tissue

Question 1

nervous tissue contains

Answer 1

• neurons
• glial cells (neuroglia)
• blood vessels

Question 2

describe unique things about neuron structure?

Answer 2

dendrites
-no golgi
soma
-neurofilaments, lipofuschin, lots of ER
axon
-no protein making organelles - gets there via cytoplasmic streaming.

Question 3

glial cells of cns?

Answer 3

astrocyte: blood brain barrier
oligodendrocyte: myelinate CNS neurons (1: many axons)
microglia: phagocytose pathogens
ependymal cells: make cerebrospinal fluid, have cilia

Question 4

glial cells of PNS?

Answer 4

satellite cell - surround ganglia

schwann cells: myelinate PNS neurons (many SC’s:one axon)

Question 5

does CNS contain connective tissue?

Answer 5

only meninges (surround brain and spinal cord) and blood brain barrier

Question 6

describe blood brain bar

Answer 6

astrocyte surrounds blood cell
made tight by tight junctions and basal lamina, containing pericytes
control passage of substances into/out of brain

Question 7

what is gray matter?

Answer 7

contains all the cells

outside of brain, inside of spinal cord

Question 8

what is white matter?

Answer 8

contains myelinated things; outside spinal cord, inside brain

Question 9

what are ganglia

Answer 9

surrounded by satellite cells

Question 10

describe connective tissue surrounding peripheral nerves

Answer 10

o	Endoneurium (around a single axon)
o	Perineurium (around group of axons)
o	Epineurium (around entire nerve fibre)
o	Also contain fibroblasts, mast cells and blood cells