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Nerve Tissue and Nerves
Exercise 25 (p. 193)
The nervous system is divided into two parts:
the (1) Central Nervous System (CNS), and the (2) Peripheral Nervous System (PNS).
The CNS consists of the
brain and spinal cord.
The PNS consists of the
cranial nerves and spinal nerves.
Nerve tissue is made up of two types of cells:
neurons and neuroglia.
The basic structural and functional units of the nervous system are
The functions of neurons include:
(1) detecting stimuli, (2) conducting impulses, (3) some involvement in decision-making.
The parts of a neuron include the:
(1) cell body, (2) dendrites, and (3) the axon.
The nucleus of a neuron is housed in the
bring information toward the cell body.
takes information away from the cell body.
The axon is a _____ process than are the dendrites.
Neurons can be categorized into the three following structural types:
(1) unipolar, (2) bipolar, and (3) multipolar.
The most common structural type of neurons are
are associated with special senses.
Multipolar neurons are found in the
Neurons can be categorized into the three following functional types:
(1) sensory (afferent), (2) motor (efferent), and (3) interneurons (association or internucial).
Most sensory neurons are
unipolar, but some are bipolar.
Sensory neurons conduct action potentials
toward the CNS.
Motor neurons are classified structurally as
Motor neurons conduct action potentials
away from the CNS.
Interneurons are classified structurally as
links between other neurons.
Interneurons are found in the
brain and spinal cord.
Neuroglia is the metaphorical ____ of the nervous system.
Neuroglia act as
protective and supportive cells of the nervous system.
There are ____ types of neuroglia.
The CNS has four types of neuroglia:
(1) astrocytes, (2) microglia, (3) ependyma, and (4) oligodendrocytes.
Astrocytes are the ____ neuroglia of the CNS.
The neuroglia of the CNS that performs an immune function is the
Ependyma covers the insides of the
ventricles, or spaces in the brain.
Oligodendrocytes of the CNS produce
This neuroglia is either cuboidal or columnar and sometimes has cilia
List the neuroglia of the CNS in order of most processes to least processes:
astrocytes, oligodendrocytes, and microglia.
The PNS has two types of neuroglia:
(1) Schwann, and (2) satellite.
The Schwann cells, a type of neuroglia of the PNS, produce
The function of the satellite cells is