How does an elephant’s trunk combine features of the nose and upper lip?

The elephant’s trunk, or proboscis, is a unique anatomical fusion of the upper lip and nose. This versatile organ serves as a multifunctional appendage that integrates the sensory and respiratory roles of the nose with the manipulative capabilities of a lip.12

The nasal component is evidenced by the nostrils located at the tip of the trunk, which serve as the primary pathway for breathing, as well as an "olfactory periscope" for sniffing the air to detect danger or locate resources. The upper lip component contributes to the trunk's extraordinary dexterity and precision. Equipped with specialized flaplike projections at the end, the trunk functions similarly to a hand, allowing the elephant to grasp, manipulate, and delicately handle objects—such as picking up a coin or feeding itself—in a manner that mirrors the use of human fingers.12

This combination of structures is supported by a complex network of nearly 150,000 muscle fascicles and two proboscidean nerves, rendering the organ both powerful enough to lift heavy loads and sensitive enough to perform fine, controlled movements.1