But a few of us can still use vestigial muscles we inherited from our animal ancestors to wiggle our ears! Humans have largely lost this ability, our ears being firmly fixed to our heads and without much range of motion. Some breeds of dogs and cats maintain this ability to move their ears to better focus on a sound without moving their whole head. In some animals, this outer “shell” or “dish” can actually move, rotating enable it to collect sound from different directions. This outside structure, called the “pinna,” acts like a satellite dish or funnel, gathering and focusing sound so that we can hear better. The outer ear, which includes the complex shell that is the visible ear we see on the outside of our heads.It does this through a system of many parts, including: Just as the eyes turn certain wavelengths of light into images, so the ear turns certain wavelengths of vibration into sounds. In this article, we will focus on the structure and anatomy of the human ear. It is these signals sent to our brain from the ear which allow our eye muscles and other muscles to compensate for the small movements our body makes. By sensing the movements of these stones, the ear can tell our brain where we are relative to the directions up and down, and how our body is moving or accelerating. In humans, the inner ear contains parts called the semicircular canals, where otoliths – tiny stone-like structures – shift in response to gravity and the movement of our body. In some animals, including most mammals, the ear is also used for balance.
Most vertebrates have two ears: one on either side of the head. The human ear picks up and interprets high-frequency vibrations of air, while the sound-sensing organs of aquatic animals are designed to pick up high-frequency vibrations in water. Most animals have some sort of ear to perceive sounds, which are actually high-frequency vibrations caused by the movement of objects in the environment. The ear is the organ found in animals which is designed to perceive sounds.
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