The masseter muscle is a facial muscle that plays a major role in the chewing of solid foods. The muscle is shaped like a parallelogram, connecting to your mandible (lower jawbone) and your cheekbone.

Much like their name implies, the quadricep muscles were once thought to be a set of four muscles, with the name “quad” translating to “four or fourth” in Latin. However, it has since been discovered ...

Muscle twitches fall into two main types. There’s myoclonus, where a whole muscle or group of muscles twitch or spasm. Then ...

In the orbit of the eye, also called the eye socket, the lateral rectus muscle helps move the pupil away from the body’s midline. The muscle inserts into the temporal (outer) side of the eyeball and ...