Question 1

Which of the following best describes the function of central pattern generators (CPGs) at the segmental level of motor control?

Accepted Answer

They regulate the timing and pattern of repeated, rhythmic movements such as walking by networks of oscillating inhibitory and excitatory neurons.

Question 2

A patient presents with flaccid paralysis of the lower limbs after a spinal cord injury. Which of the following best explains the underlying mechanism?

Accepted Answer

Damage to ventral roots or anterior horn cells, preventing both voluntary and involuntary impulses from reaching the muscles.

Question 3

Which of the following pathways is responsible for regulating fast and fine (skilled) voluntary movements, such as playing a musical instrument?

Accepted Answer

Lateral corticospinal tract

Question 4

During the knee-jerk (patellar) reflex, which of the following events occurs immediately after the muscle spindle is stretched?

Accepted Answer

Afferent impulses travel to the spinal cord, where they directly synapse with alpha motor neurons.

Question 5

A patient exhibits a positive Babinski sign (dorsiflexion of the great toe and fanning of the other toes) when the plantar surface of the foot is stroked. This finding is most indicative of:

Accepted Answer

Damage to the primary motor cortex or corticospinal tract

Question 6

Which of the following best explains why the tendon reflex is important during intense muscle contraction?

Accepted Answer

It causes the contracting muscle to relax and its antagonist to contract, protecting against excessive tension and potential tearing.

Question 7

Which of the following statements about the organization of the autonomic nervous system (ANS) is correct?

Accepted Answer

The ANS uses a two-neuron chain, with the preganglionic neuron synapsing with the postganglionic neuron in a ganglion outside the CNS.

Question 8

A person is startled by a loud noise and immediately turns their head and eyes toward the source. Which descending motor pathway is primarily responsible for this response?

Accepted Answer

Tectospinal tract

Question 9

Which of the following best describes the role of the basal nuclei in motor control?

Accepted Answer

They initiate and stop movements, block unwanted movements, and send output primarily to premotor and prefrontal cortical areas via the thalamus.

Question 10

Which of the following is a key difference between the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

The sympathetic division mobilizes the body during emergencies, while the parasympathetic division conserves energy and promotes maintenance activities.

Question 11

A patient with a spinal cord transection at the level of C5 would most likely experience which of the following?

Accepted Answer

Quadriplegia, with loss of function in all four limbs

Question 12

Which of the following best explains why descending motor pathways usually activate both alpha and gamma motor neurons simultaneously?

Accepted Answer

To maintain the sensitivity of the muscle spindle by keeping intrafusal fibers taut during muscle contraction.

Question 13

Which of the following is true regarding the stretch reflex?

Accepted Answer

It is monosynaptic and ipsilateral, causing contraction of the stretched muscle and inhibition of its antagonist.

Question 14

A person steps on a sharp object with their right foot. Which of the following best describes the sequence of reflexes that occur?

Accepted Answer

Ipsilateral withdrawal (flexor) reflex and contralateral extensor reflex

Question 15

Which neurotransmitter is released by all somatic motor neurons at the neuromuscular junction?

Accepted Answer

Acetylcholine (ACh)

Question 16

Which of the following best describes the function of the cerebellum in the precommand level of motor control?

Accepted Answer

It calculates the best way to perform a movement and sends a blueprint to the motor cortex while monitoring proprioceptive feedback.

Question 17

Which of the following is a correct sequence of events in voluntary movement initiation, according to the 'putting it all together' model?

Accepted Answer

Premotor cortex plans the movement, precommand areas provide timing and patterns, basal nuclei release motor centers from inhibition, cerebellum sends blueprint, and primary motor cortex sends signals down direct pathways.

Question 18

Which of the following best explains why the abdominal reflex is used to test the integrity of the spinal cord from T1 to T12?

Accepted Answer

It involves contraction of abdominal muscles in response to cutaneous stimulation, which requires intact pathways through T1 to T12.

Question 19

Which of the following best describes the effect of the parasympathetic nervous system when reading a newspaper after a meal?

Accepted Answer

Promotion of digestion, defecation, and diuresis

Motor Systems and Reflexes: Neuroanatomy & Neurophysiology Study Notes

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