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level: Nerve Tissue

Questions and Answers List

level questions: Nerve Tissue

Question	Answer
Carry out the functions of the nervous system by conducting nerve impulses.	Neurons. They are highly specialized and amitotic = if a neuron is destroyed, it cannot be replaced because neurons do not go through mitosis.
Identify the parts of a Neuron	Answer
Part of a neuron: It has a nucleus with at least one nucleolus and contains many of the typical cytoplasmic organelles.	Cell Body
Part of a neuron: Cytoplasmic extensions, or processes, that project from the cell body. Sometimes referred to as fibers. Usually but not always short and branching, which increases their surface area to receive signals from other neurons.	Dendrites
Part of a neuron: Also a cytoplasmic extension, and may have infrequent branches called axon collaterals. They terminate in many short branches.	Axons
Type of neuron: 1 axon, several dendrites; most common; eg. motor neurons, interneurons	Mutlipolar
Type of neuron: 1 axon, 1 dendrite; rare; eg. retina, nose, ear	Bipolar
Type of neuron: 1 process; short with 2 branches (sensory, CNS); eg. PNS ganglia	Unipolar
These cells do not conduct nerve impulses, but instead, they support, nourish, and protect the neurons. They are far more numerous than neurons.	Neuroglia
True/False: Neuroglia are not capable of mitosis.	False. They are capable of mitosis.
What are the types of Neuroglia in CNS?	Answer
What are the types of Neuroglia in PNS?	Answer
Type of CNS neuroglia that are the most abundant	Astrocytes
Type of CNS neuroglia that are defensive cells	Microglial cells
Type of CNS neuroglia that line cerebrospinal fluid-filled cavities	Ependymal cells
Type of CNS neuroglia that have processes that form myelin sheaths around CNS nerve fibers	Oligodendrocytes
Types of PNS neuroglia that form myelin and surrounds neurons in the PNS	Satellite and Schwann cells
Schwannomas are benign _____ of the peripheral nervous system which commonly occur in their sporadic, solitary form in otherwise normal individuals.	tumors
This problem is a fairly common benign nerve growth and begins when the other outer coating of a nerve in foot thickens. This thickening is caused by irritation of branches of the medial and lateral plantar nerves that results when 2 bones repeatedly rub together.	Morton's Neuroma