Nervous System #1 Flashcards
(28 cards)
What is the part of the neuron that contains the nucleus?
Cell body
What is a neuron?
A nerve cell
What is the highly branched part of the neuron that receives nerve impulses and conducts them toward the cell body?
Dendrites
What is that usually long process of the neuron that conducts nerve impulses away from the cell body?
axon
What is the function of the myelin sheath?
She that envelops axon and increases the speed of nerve impulse
What is the name of the short interval in the myelin sheath?
Node of Ranvier
What is the plasma membrane of a Schwann cell?
Neurilemma
What is the Schwann cell?
Sell that covers the axon and forms the myelin sheath
What principle states that the strength of a response of a neuron’s or muscle cell is not dependent upon the strength of the stimulus?
All or none law
What is the synaptic knob?
The tips of the terminal end of each axon
What are the synaptic vesicles?
Several small intracellular membrane-bound vesicles in the synaptic knob that contains the neuron transmitter
What is the synaptic Junction?
The junction where a nerve impulse passes from one neuron to the next
How are nerve impulses transferred from one neuron to the next?
Buy a neuron transmitter
what is a neuromuscular junction?
The junction between a nerve fiber and the muscle it supplies
What is a nerve?
A cord like bundle of fibers made up of neurons through which sensory and motor impulses travel
Name and describe the three main layers of a nerve
epineurium-dance sheath of connective tissue to that surrounds the trunk of a nerve (outer layer)
Perineurium-The sheets of connective tissue that encloses a bundle of nerve fibers
Endoneurium- a layer of delicate connective tissue around the myelin sheath of each myelinated nerve fib
What type of neuron are the motor neurons?
Efferent
What type of neural are the sensory neurons?
Afferent
How do individual neurons connect (be specific)?
Axon of one neuron connects to the dendrites of another neuron
Name and describe the two structures that make up that central nervous system
Brain and spinal cord
What are the three parts of the brain?
Cerebrum, cerebellum, brainstem
Where the four parts of the largest part of the brain that is associated with higher brain function?
Frontal lobe, Parietal lobe, Temporal lobe, Occipital lobe
What is the cauda equina and where does it begin?
Group of nerve roots that exit the end of the spinal cord at second lumbar vertebrae
Second through fifth lumbar nerve pears, one through five sacral nerve, coccygeal nerve pairs
What is the gray matter of the brain and spinal cord?
Unmyelinated it – area of brain and spinal cord where cell bodies of the nerve cells are located
