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    NOTE: Since the back of the pages are printed in reverse order (last page is printed first), keep the pages in the same order as they were after Step 1. Also, be sure to feed the pages in the same direction as you did in Step 1.
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40 notecards = 10 pages (4 cards per page)

Viewing:

Histology of Nervous Tissue

front 1

Nervous Tissue

back 1

-the master integrating and coordinating system
-monitors and processes sensory info
-divided into central nervous system and peripheral nervous system

front 2

Central Nervous System

back 2

-consists of brain and spinal cord

front 3

Peripheral Nervous System

back 3

-includes all nervous elements located outside the central nervous system
*ex: nerves, sensory receptors, and some cluster of nerve cells

front 4

Nervous Tissue

back 4

-made up of neurons and neuroglia cells

front 5

Neuroglia/ Glial Cells

back 5

-serves the needs of the delicate neurons by bracing and protecting them
CNS: astrocytes, oligodendrocytes, microglial cells, and ependymal cells
PNS: Schwann cells and satellite cells

front 6

Microglial Cells

back 6

-acts as phagocytes

front 7

Oligodendrocytes & Schwann Cells

back 7

-myelinate the cytoplasmic extensions of the neurons

front 8

Astrocytes

back 8

-play a role in capillary-neuron exchanges and control the chemical environment around neurons

front 9

Neuron/Nerve Cells

back 9

-basic functional units of nervous tissue
-transmit messages from one part of the body to another in the form of nerve impulses

front 10

Cell Body of Neuron

back 10

-slender processes extend
-both the biosynthetic center of the neuron and part of its receptive region
-make up the gray matter of the CNS and form clusters there called nuclei and ganglia in PNS
-contains a large round nucleus surrounded by cytoplasm

front 11

Nuclei

back 11

-cluster of neuron cell bodies in CNS

front 12

Ganglia

back 12

-cluster of neuron cell bodies in PNS

front 13

Two structures found in the cytoplasm

back 13

Neurofibrils and Chromatophilic Substance

front 14

Neurofibrils

back 14

-provide support for the cell and a means to transport substances throughout the neuron

front 15

Chromatophilic Substance/Nissl Bodies

back 15

-an elaborate type of rough endoplasmic reticulum involved in the metabolic activities of the cell

front 16

Two Types of Neuron Processes.

back 16

1.Dendrites
2.Axons

front 17

Dendrites

back 17

-receptive regions that bear receptors for neurotransmitters released by the axon terminals of other neurons

front 18

Axons/Nerve Fibers

back 18

-form the impulse generating and conducting region of the neuron
-the white matter of the nervous system

front 19

Tracts

back 19

-bundles of axons in the CNS

front 20

Nerves

back 20

-bundles of axons in PNS

front 21

Neurons may have several dendrites, but they only have a single _____________.

back 21

Axon

front 22

Axon Collaterals

back 22

-branch off of the main axon forming more processes

front 23

Axon Hillock

back 23

-conical area of origin of the axon from the nerve cell body

front 24

Axon Terminals

back 24

club-shaped endings by which axons make synaptic contacts with other nerve cells or effector cells
-stores the neurotransmitter chemical in tiny vesicles

front 25

Synaptic Cleft

back 25

- a narrow extracellular cleft between the presynaptic and postsynaptic membranes

front 26

Neuromuscular Junction

back 26

-specialized synapses between neurons and skeletal muscles

front 27

Myelinated Fibers

back 27

-long nerve fibers that are covered by fatty material (myelin)

front 28

Axons in the PNS are typically heavily myelinated by special supporting cells called ______________.

back 28

Schwann Cells

front 29

Schwann Cells

back 29

-wrap themselves tightly around the axon in jelly roll fashion, this wrapping is the myelin sheath

front 30

Nodes of Ranvier

back 30

-gaps or indentations in the myelin sheath

front 31

Within the CNS myelination is accomplished by neuroglia called ________________.

back 31

Oligodendrocytes

front 32

Unipolar Neurons

back 32

-one very short process which divides into peripheral and central processes, extends from cell body

front 33

Bipolar Neurons

back 33

-have two processes attached to the cell body
-rare

front 34

Multipolar Neurons

back 34

-many processes

front 35

Sensory (Afferent) Nerves

back 35

- conduct impulses only toward the CNS

front 36

Motor (Efferent) Nerves

back 36

-carry impulses only away from the CNS

front 37

Mixed Nerves

back 37

-nerves carrying both sensory and motor fibers

front 38

Endoneurium

back 38

-delicate connective tissue enveloping individual nerve fibers

front 39

Perineurium

back 39

-sheath of connective tissue enclosing a bundle of nerve fibers
-forming fascicles

front 40

Epineurium

back 40

sheath of connective tissue around all fascicles of nerve fibers