The deep muscles of the hand have very particular functions, such as flexing or pulling the hand away from the body. Together with the hand’s other muscles, tendons, ligaments, vessels, and bones, ...

Human embryos are more muscle-bound than adult humans, new microscope images cataloging early development show. For instance, at seven weeks of gestation, embryonic hands have about 30 muscles. Adults ...

Split hand syndrome is a potential sign of amyotrophic lateral sclerosis (ALS). This means that some of the muscles in the hand are weak and thin (atrophied), while others are less affected.