Nervous Tissue I

Question 1

what does nervous tissue do?

Answer 1

COMMUNICATE

neurons coordinate and integrate cell signals

neurons supported by various glia

Question 2

what does efferent mean?

Answer 2

to be carried AWAY from

Question 3

what does afferent mean?

Answer 3

to be carried TOWARDS a center

Question 4

what is sensory input?

Answer 4

AFFERENT

information brought from the periphery to the CNS

Question 5

what is motor output?

Answer 5

EFFERENT

information leaving the CNS for the periphery

Question 6

name some motor output examples

Answer 6

skeletal muscle - voluntary movement

chewing

Question 7

name some sensory input examples

Answer 7

touch, pain, temperature, etc

Question 8

what makes up the CNS?

Answer 8

brain

spinal cord

Question 9

what makes up the PNS?

Answer 9

cranial nerves

spinal nerves

Question 10

what are neurons and what is the most common type?

Answer 10

they are functional cells —> primary function is to generate and propagate action potentials

multipolar neurons (traditional neuron type)

Question 11

what are glial cells?

Answer 11

they are support cells for the neuron

Question 12

what is neuropil?

Answer 12

synaptically dense regions that are composed of unmyelinated axons, dendrites and processes of glial cells

Question 13

is there connective tissue in the CNS?

Answer 13

NO NO NO

Question 14

what are the green arrows pointing to?

Answer 14

neurons

Question 15

what are the BLUE arrows pointing to?

Answer 15

glial cells

Question 16

what do dendrites do?

Answer 16

deliver info TO the cell body

Question 17

what makes up the cell body?

Answer 17

central circle part of the dendrite formation

has nucleus and nucleolus

Question 18

what is the axon hillock?

Answer 18

is the broad to narrow base section right after the cell body

connects cell body to axon

Question 19

what is the initial segment?

Answer 19

is the 1st part of the axon

where the action potential initiates

Question 20

what is the internodal segment?

Answer 20

area where the axon is protected from the ECM as environment will mess with AP

Question 21

what are the nodes of ranvier?

Answer 21

they are gaps that allow ions to diffuse in and out of the neuron, propagating the electrical signal down the axon

Question 22

what are terminal arborizations?

Answer 22

terminal branches of the cell

Question 23

what are boutons?

Answer 23

enlargements at the end

Question 24

what are nissl bodies?

Answer 24

subcellular structures found in nerve cell bodies and dendrites

contain rough ER and ribosomes

Question 25

what are neurofilaments?

Answer 25

intermediate filaments that provide structural support to the cell (cytoskeletal structures)