OSMT (Ontario Society of Medical Technologists) Practice Exam

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Which statement is NOT true of peripheral nerves and neurons?

a. Motor neurons carry impulses from the CNS to effectors
b. A mixed nerve contains both sensory and motor neurons
c. Peripheral nerves are in the arms, legs and trunk of the body
d. Sensory neurons may also be called efferent neurons

The correct answer is: d. Sensory neurons may also be called efferent neurons

The statement that sensory neurons may also be called efferent neurons is not true. Sensory neurons are responsible for transmitting sensory information from the peripheral parts of the body to the central nervous system (CNS). They carry impulses towards the CNS and are therefore classified as afferent neurons. In contrast, efferent neurons, or motor neurons, carry impulses away from the CNS to effectors, such as muscles and glands. This distinction underlines the fundamental difference in function between sensory and motor neurons in the nervous system. The other statements are accurate: motor neurons indeed carry impulses from the CNS to effectors, a mixed nerve does contain both sensory (afferent) and motor (efferent) neurons, and peripheral nerves are found in the limbs and trunk of the body, connecting the CNS to the rest of the body.