nervous system pt 2

Surround axons

Schwann cells

Phagocytic white blood cells

microglia

Surround axons to help improve performance

neuroglia

Help direct growth in t he embryo

astrocytes

Maintains the blood-brain barrier.

astrocytes

Perform repairs to help prevent further injury to damaged nervous tissue

astrocytes

Axons are responsible for carrying impulses ____________________ from the cell body.

away

The "slight elevation from the body" of the neuron is called the

axon hillock

Near the end of an axon there may be many "fine extensions, each with a specialized ending" called a ________________________________________.

axon terminal

Dendrites are typically highly ____________________ and provide a ____________________ surface with which processes from other neurons communicate.

branched, receptive

What are three features typical of all neurons?

cell body dendrites and axon

The "branches" of an axon are called

collaterals

Secrete cerebrospinal fluid

ependymal cells

A type of epithelial cell

epithedymal cells

A typical neuron usually has (one/many) dendrites.

many

Increase in number in response to brain injury

microglia

Schwann cells are composed of layers of ________________________, and the coating it forms is called a _____________________________ (which "wraps around the axons somewhat like a bandage wrapped around a finger.)

myelin, myelin sheath

Axons that have myelin sheaths around them are called ________________________ axons.

myelinated axons

What is responsible for forming the "white matter" of the brain?

myelinated nerve axons

What is stored in a synaptic knob?

neurotransmitters

The "narrow gaps in the myelin sheath" between schwann cells on an axon are called ____________________________________________.

nodes of ranvier

White matter

oligodendrocytes

form myelin sheaths

oligodendrocytes

How many axons does a typical neuron have?

one

Found in ganglia

satellite cells

Surround cell bodies

satellite cells

Can form myelin sheath around axon

swhann

What is the junction between two neurons called? ______________________________

synapse

At the end of an axon terminal is a _________________________________, found close to the receptive surface of another cell.

synaptic knob

Axons that do not have myelin sheaths around them are called _______________________________ axons.

unmyelinated axons

What is responsible for forming the "Gray matter" of the brain?

unmyelinated nerve tissue