Final answer:
Visceral afferent fibers provide sensory information above the pectinate line and follow the course of the inferior mesenteric artery.
Step-by-step explanation:
The sensory fibers that provide information above the pectinate line are visceral sensory fibers. These are afferent fibers that transmit sensory information from organs to the central nervous system. Specifically, above the pectinate line, the mucosa is innervated by visceral afferent fibers which are insensitive to pain. These fibers follow the course of the inferior mesenteric artery, as they are part of the autonomic nervous system—which includes sympathetic and parasympathetic components—and communicate with collateral ganglia such as the inferior mesenteric ganglia.