Exam 3 Review

Cranial nerves are part of the central nervous system.

• True

• False

Answer explanation

ALL nerves are part of the peripheral nervous system. Only the brain and spinal cord comprise the central nervous system.

Which of the following neuron types carry signals to the CNS?

• sensory

• efferent

• motor

• afferent

Answer explanation

Sensory = afferent (think SAME DAVE).

Baby Jay is walking up the stairs of the Union and smells fried Wildcat. In response, Baby Jay begins to salivate. What type of sensory input and motor output is this?

• Somatic sensory; somatic motor

• Somatic sensory; visceral motor

• Visceral sensory; somatic motor

• Visceral sensory; visceral motor

Answer explanation

Smell is one of the visceral senses.

Salivation comes from glandular secretions = visceral motor

Which of the following glial cells can produce electrical signals?

• Astrocytes

• Microglia

• Satellite cells

• Oligodendrocytes

• None of the above

Answer explanation

Glial cells CANNOT transmit electrical impulses

Which of the following glial cells form myelin sheaths around MULTIPLE axons?

• Oligodendrocytes

• Satellite cells

• Neurolemmocytes

• Schwann cells

A bundle of axons in the PNS is called?

• Nuclei

• Ganglia

• Tracts

• Fibers

A typical sensory neuron has what structural classification?

• Unipolar

• Bipolar

• Nonpolar

• Multipolar

Answer explanation

Multipolar = motor and interneurons

Bipolar neurons = rare, only found in special sense organs

Which of the following would INCREASE the rate of conduction in a neuron?

• No myelin sheath

• Increase stimulus strength

• Increase axon diameter

• None of the above

Answer explanation

Rate of conduction is influenced by two factors:

-axon diameter = > diameter, > conduction

-myelination = presence of myelin increases conduction

Cell bodies of interneurons and motor neurons are found in the ____ matter. (hint: color)

Answer explanation

Gray matter = interneurons, cell bodies of interneurons and motor neurons, glial cells (Gray matter is gray because the region is dense with cell bodies)

White matter = fiber tracts of myelinates and nonmyelinated axons

Which type of synapse is bidirectional?

• Electrical

• Chemical

• Both

• Neither