The Motor Units of the Thumb,fingers,and Face Contain the

question 41

Multiple Choice

The motor units of the thumb,fingers,and face contain the

• A) fewest muscle fibers.
• B) most muscle fibers.
• C) fewest motor neurons.
• D) most motor neurons.
• E) most extensors.

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Definitions:

Ansa Cervicalis

Ansa cervicalis is a loop of nerves in the neck that serves to innervate certain muscles responsible for movements of the larynx, pharynx, and other nearby structures.

Autonomic Reflexes

Reflex actions within the body that are involuntarily controlled by the autonomic nervous system, influencing functions such as heart rate and digestion.

Stretch Reflexes

The muscle contraction in response to stretching within the muscle, a mechanism known to maintain muscle tone.

Withdrawal Reflexes

Automatic, quick responses of the body part to a painful stimulus, resulting in pulling away from the source of pain to prevent injury.