Which nerve fibers are distributed to the arrector pili muscles attached to the hair follicles?
Motor Nerve Fibers
Motor nerve fibers are a type of nerve fiber that transmits electrical impulses from the brain and spinal cord to the muscles. These impulses activate the muscles and cause them to contract, leading to movement. Motor nerve fibers are part of the somatic nervous system, which is responsible for voluntary movements such as walking, talking, and lifting objects.
There are two types of motor nerve fibers: somatic and autonomic. Somatic motor fibers are responsible for the contraction of skeletal muscles, while autonomic motor fibers control the contraction of smooth and cardiac muscles, as well as gland secretion. Somatic motor fibers are under conscious control, while autonomic motor fibers are not.
The speed at which motor nerve fibers conduct impulses varies depending on diameter and myelination. Larger, myelinated fibers transmit impulses faster than smaller, unmyelinated fibers. Myelination is the process in which a fatty substance called myelin is wrapped around the axon of a neuron, which increases the speed of neural transmission.
Motor nerve fibers can be damaged or destroyed by a variety of factors, including injury, disease, or genetic disorders. Damage to motor nerve fibers can result in muscle weakness, paralysis, or loss of muscle tone. Treatment for motor nerve fiber damage varies depending on the cause and severity of the damage, but may include physical therapy, medication, or surgery.
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