The interossei are a group of muscles located in the hands and feet. In the hand, there are two types: the dorsal interossei, which help spread the fingers apart, and the palmar interossei, which assist in bringing the fingers together. These muscles play a crucial role in fine motor skills and grip strength. In the foot, the interossei also consist of dorsal and plantar muscles. The dorsal interossei help to spread the toes, while the plantar interossei bring them together. Proper functioning of the interossei is essential for balance and walking, contributing to overall mobility and stability.