Anatomy And Physiology Advanced - Qp8

Explanation
White matter primarily contains motor or efferent fibers. Motor fibers are responsible for transmitting signals from the brain to muscles and glands, enabling voluntary movements and various bodily functions. Efferent fibers carry information away from the central nervous system (CNS) to the peripheral nervous system (PNS). In contrast, sensory or afferent fibers are found in gray matter and are responsible for transmitting sensory information from the PNS to the CNS.

Explanation
The cranial nerves are a set of twelve pairs of nerves that originate from the brain and control various functions of the head and neck. Some cranial nerves are primarily motor nerves, meaning they control the movement of muscles, while others are primarily sensory nerves, responsible for transmitting sensory information from the head and neck to the brain. Therefore, it is correct to say that the cranial nerves are either motor or sensory nerves.

Explanation
The glossopharyngeal nerve supplies the posterior part of the tongue and pharynx and is responsible for the sense of taste.

Explanation
Sciatica is a common cause of back pain. It occurs when the sciatic nerve, which runs from the lower back down through the legs, becomes irritated or compressed. This can result in pain, numbness, and tingling in the lower back, buttocks, and legs. Therefore, the statement "A common cause of back pain is sciatica" is true.