Nervous Tissue Flashcards
What stimulated neurons
Electrical impulses and chemical stimulants
What are the cell types found within this tissue
Neurons
Glia cells
What the the large central portion of the neuron called
Cell body or soma
What the point of attachment between the cell body and axon called
Axon hillock
What are the ends of the axon called
Axon terminals
What portion of the cell receives info
Dendrites
Do axons send or receive info to/from the next cell
Send
How many axons can one cell have
One
What is the purpose of the axon hillock
It generates the message to be carried though the axon
What is a synapse
A synapse is the relay of information when an axon passes the message onto the receiving neuron’s dendrite. The message is passed through chemical signals that is corresponding to the receptor on the dendrite
How many dendrites and axons do multipolar neurons have
Dendrites- many
Axons-only one
What is the function of multipolar neurons
Motor neurons - initiate action
Interneurons - transmit signals through the brain and spinal cord
-most the the neurons in the body
Describe bipolar neurons and where they are found in the body
Two processes
1 axon
1 dendrite
Found only in the eye and ear for sensory information
What is the function of a unipolar neuron
Sensory neurons that send the message straight to the brain/spinal cord
What four types of glia are found in the central nervous system
Astrocytes
Microglia
Ependymal cells
Oligrodendrites “oligos”
What are the functions of astrocytes
Maintain environment- particularly the ion balance
Keep out unwanted substances
-form the blood brain barrier
The blood vessels in the brain are coated with astrocytes
What is the function of Microglia
Immune cells
What do ependymal cells do
They line fluid filled cavities and circulate the fluid
modified epithelium and tightly packed
What do oligodendrocytes do
They myelinate and insulate axons
What two organs comprise the central nervous system
Brain and spinal cord
What is considered to be part of the peripheral nervous system
Nerves and sensory receptors
What do neurolemmocytes (Schwann cells) do?
Myelinate axons
What is the function of satellite cells
Function like astrocytes and are found around cell bodies
