Nervous Tissue Flashcards Preview

Honors Anatomy & Physiology > Nervous Tissue > Flashcards

Flashcards in Nervous Tissue Deck (24):
1

What are the 2 type of cells in nervous every tissue?

Neurons & neuroglia

2

Neurons
Contain? Functions?

Excitable (respond to stimuli)
Transmit electrical signals
Contain organelles
-ER, mitochondria, nucleus in cell body

3

Neuroglia
Location? Functions? Consists of?

Small cells SURROUND neurons
25x more in # than neurons
Support & other functions

4

Neurons, what do they do? Length?

Convert stimuli into ACTION POTENTIALS
-electrical signal travels along neuron membrane
-travel @ .5 to 130 meters/seconds or up to 290 mph
1 mm to 1 m in length (longest in legs)

5

What can't neurons do?

Cannot under go mitosis

6

Structure of neurons

Input region (dendrites)
Integration region (cell body)
Output region (axon)

7

Myelination of axon
What's myelin? What does it cover? What does it do?

Myelin
Most neurons covered by myelin (lipid & protein)
-insulates axon
-speeds up conduction of impulses

8

How is myelin produced/made? Where are they Located? Function of them?

Produced by Schwann cells (PNS) & Oligodendrocytes (CNS)
Axons covered w/ Schwann cells
-protects myelin
-gaps btwn each Schwann cells- node of Ranvier

9

Lost the Classification of neurons- function

Sensory (afferent) neurons
Motor (efferent) neurons
Interneurons

10

Sensory (afferent) neurons
Polarity? Function? Location?

Connected to sense receptors or have receptors
Function: transmit impulses to CNS
-unipolar in SNS & ANS
-bipolar in special sense neurons

11

Motor (efferent) neurons
Polarity? Function?

-multipolar neurons
-function: carry info from CNS to effectors

12

Interneurons
Polarity? Function? Description?

Short distance
Function: contact w/ nearby neurons
-multipolar

13

Relate classification of neurons- functions to touching a hot pan

Sensory (afferent) neurons - sense something hot
Motor (efferent) neurons - movement of pulling back, ( or like writing out words )
Interneurons - in spinal cord, tells to pull back from the hot object

14

Nervous tissue is made of how many types of cells?

2 types

15

most common glial cells in the CNS are

astrocytes

16

myelin sheaths that surround the axons of the neurons in the CNS are formed by the glial cell

oligodendrocyte

17

a functional neuron w/ a cell body located in the CNS whose primary function is connecting other neurons is called a(n) ______ neuron

interneuron

18

the structural classification of a neuron w/ 1 axon and 1 dendrite that extends from opposite sides of the cell body is called a ____ neuron

bipolar

19

what type of structural neuron is the most common type of neuron in the CNS

multipolar

20

the neuron process that normally receives incoming stimuli are called

dendrites

21

which type of neuroglia cell is involved removing damaged nerve tissue and invading microbes

microglia

22

what is the function of myelin

insulates the axon (main function) and helps conduct impulses faster

23

which type of structural neuron is the most rare & found in the retina of the eye?

bipolar

24

motor (efferent) neurons are usually what type of structural neuron?

multipolar