The quadriceps, or quads, are a group of four muscles on the front of the thigh. They are some of the largest and strongest muscles in the body. The quad muscles allow a person to stand, walk, run, ...

Neck muscles have an essential role in supporting and stabilizing your neck. More than 20 muscles are working to keep your head supported and moving. Your neck muscles have a range of responsibilities ...

The thigh muscles are part of your upper legs and contain some of the most powerful structures in your body. However, they are prone to injuries if they’re overstrained or impacted while playing a ...

The zygomaticus major muscle is a muscle that controls facial expression, drawing the mouth’s angle upward and outward. The zygomaticus major muscle starts at the cheekbone and extends to the corner ...

The thenar eminence refers to the bulge that can be seen at the base of your thumb. It’s made up of three separate muscles that work to control the fine motions of the thumb. We’ll take a closer look ...

Evolution has left humans with many vestigial traits—remnants of once-useful biological features that serve little or no ...

Biological muscles act as flexible actuators, generating force naturally and with an impressive range of motion.