A&P CHPT 9 Flashcards
The system as a whole has two principle divisions called ?
central nervous system
peripheral nervous system
What is in the CNS?
Brain
Spinal cord
What is in the PNS?
All nerves
Autonomic system
What is in the autonomic system?
Heart rate, contraction of stomach and intestines, and secretion of chemical compounds
What are two major types of cells found in nervous tissue?
neurons
glia cells
what are neurons?
nerve cells
What is glia?
support cells
Neurons consists of three parts?
1) cell body
2) dendrites
3) axon
What is the “cell body” of the neurons?
it’s the main part
What is the “dendrites” of neurons?
one or more branching projection
What is “axon” of neurons?
one en-longed projection
What are the types of neurons?
1) sensory neuron
2) motor neuron
3) Interneurons
Sensory neuron does what?
carry impulses to the spinal cord and brain
What is sensory neuron is also called?
afferent neuron
What does the motor neuron do?
carry impulses away from the brain and spinal cord
What type of tissues is motor neuron?
muscle
glandular
What is the motor neuron also called?
efferent neuron
What does the interneurons do?
conduct impulses from sensory neurons to motor neurons.
What is interneurons also called?
central or connecting neurons
glia or neuroglia is what?
special types of supporting cells
An important reason for discussing glia is one of the most common type of brain tumor called?
glioma
glia performs many different functions including
the regulation pf neuron function
Glia vary in size and shape:
Large cells that look somewhat like stars
(threadlike branches)
atstrocytes
along the the walls of the blood vessels, astrocyte branches form a two layer structure called
Blood brain barrier
what is smaller then astrocytes
microglia
microglia usually ….
remains stationary
The _____ separates the blood tissue and nervous tissue to protect vital brain tissue from harmful chemicals that may be in blood
BBB BLOOD BRAIN BARRIER
The ____ helps to hold nerve fibers together
oligodencytes