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Proprioception is the perception of one's own body position, posture, and equilibrium. This sense is crucial for coordinating movements, as it provides continuous information about limb and muscle positions.1

Proprioceptors are sensory receptors that enable this awareness. In vertebrates, these include receptors in muscles (muscle spindles) and tendons (tendon organs). These receptors respond to stretching and tension, informing the central nervous system about the body's state. For example, muscle spindles are highly sensitive to changes in muscle length, while tendon organs signal muscular tension.1234

Other proprioceptors are found in joints and skin, contributing to the sensation of limb position. Invertebrates have comparable organs, such as stretch receptors and chordotonal organs. For equilibrium, animals use structures like statocysts (in invertebrates) or the saccule and utricle in the vertebrate ear, which detect gravity.31

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