Nervous System Part 1 Flashcards
(42 cards)
Peripheral nervous system (PNS)
Nurse extend to outline or peripheral parts of the body
Autonomic nervous system
Consists of structures that regulate the bodies automatic or involuntary functions. A subdivision of the peripheral nervous system
What do neurons do
Conduct impulses
What do glia do
Support neurons
Three main parts of a neuron
The cell body, dendrites, and axon
Three types of neurons
Sensory neuron’s, motor neurons, interneurons
Sensory neuron’s are also called what
Afferent neurons
Motor neuron’s are also called what
Efferent neurons
What is an efferent neuron?
They transmit impulses in the opposite direction, away from the brain and spinal cord
What is a motor neuron
They transmit impulses in the opposite direction, away from the brain and spinal cord
What is a sensory neuron
They transmit impulses to the spinal cord and brain from all parts of the body body
What is an afferent neuron
Transmit impulses to the spinal cord and brain from all parts of the body
What is an interneuron
Conduct impulses from sensory neuron’s to motor neuron’s
Myelin
A white, fatty substance formed by Schwann cells the wraparound some axons outside the central nervous system
What is the axon surrounded by
Myelin
Myelinated fibers
Wraparound some axons outside the central nervous system
Nodes of Ranvier
Our intentions between adjacent Schwan cells.
Neurilemma
The outer cell membrane of a Schwann cell
Function of Glia cells
To hold the functioning neurons together and protect them
Glioma
One of the most common types of brain tumors that develop from Glia
Astrocytes
Glia cells with thread like branches that attach to neuron’s into small blood vessel’s and hold the structures close to each other
Blood brain barrier (BBB)
A two layer structure formed by astrocyte branches. It separates the blood tissue and nervous tissue to protect vital brain tissue from harmful chemicals that might be in the blood
Microglia
Glia cells that are smaller than astrocytes. They usually remain stationary, but inflamed or degenerating brain tissue, they and large, move about, and act as microbe eating scavengers.
Oligodendrocytes
Help to hold nerve fibers together and also serve another and probably more important function; they produce the fatty myelin sheath that enevelips nerve fibers located in the brain and spinal cord. (Gli cell)
