PSI Barbering Practice Exam

What type of nerve carries impulses from the brain to the muscles?

1. Motor

2. Sensory

3. Accessory

4. Interneuron

The correct answer is: Motor

The correct answer focuses on the role of motor nerves, which are specifically responsible for transmitting impulses from the brain to the muscles. These nerves facilitate voluntary movements by conveying signals that instruct muscles to contract or relax, allowing for coordinated physical activity. Understanding the function of motor nerves is crucial in the context of overall neuromuscular function, as they play a key role in movement execution. In contrast, sensory nerves carry signals from sensory receptors to the brain, allowing the body to perceive and respond to external stimuli. Accessory nerves generally refer to specific cranial nerves that have varied functions but are not primarily involved in conveying motor impulses to skeletal muscles. Interneurons function mainly within the central nervous system, connecting sensory and motor pathways but do not directly carry impulses from the brain to the muscles. Thus, the identification of motor nerves accurately captures the specific directionality and function desired in the question.