Muscles are tissues that contract to help parts of the body move. Learn more about how muscles work, what they look like, and how they're treated.
Photo of a woman stretching her groin.
Gracilis Muscle: Anatomy, Function, and Treatment
Photo of a forearm.
Brachioradialis Muscle: Anatomy, Function, and Conditions
Gym workout.
Pectoralis Minor Muscle: Anatomy, Function, and Treatment
Anatomical photo of the lower leg.
Peroneus Longus: Anatomy, Function, Rehabilitation
Man placing kinesiology tape on shins
Anterior Tibialis Muscle of the Lower Leg
Photo of a woman stretching her hip flexor.
Iliopsoas Muscle: Anatomy, Function, and Treatment
External intercostal muscles
External Intercostals: Anatomy, Function, and Treatment
Photo of a man performing a bench press.
Pectoralis Major: Anatomy, Function, and Treatment
Photo of runner's quads.
Vastus Medialis: Anatomy, Function, Treatment
gluteus minumus
Gluteus Minimus: Anatomy, Function, and Treatment
Unrecognizable athletic woman exercising on stationary bike in a gym.
Gluteus Maximus: Anatomy, Function, and Treatment
Sporty couple stretching quads before a run
Vastus Lateralis: Anatomy, Function, and Rehabilitation
Woman in a yoga pose, stretching the deltoid muscle
Deltoid Muscle: Anatomy, Function, and Treatment
front view of the arm of a young athlete woman with a dumbbell
Biceps: Anatomy, Function, and Treatment
Woman suffering from shoulder pain, France
Serratus Anterior Muscle: Anatomy, Function, and Treatment
Closeup of the back of a man's calf as he jogs up stairs
The Soleus Muscle: Anatomy and Function
Photo of a man performing calf raises in a gym.
Gastrocnemius Muscle: Anatomy, Function, and Conditions
muscular legs of runner man running on trial mountain sea bay
Sartorius Muscle: Anatomy, Function, and Treatment
Man holding his painful elbow
Tendon Sheath: Anatomy, Function, and Treatment
Photo of a man examination a patient's knee.
Synovium: Anatomy, Function, and Treatment
Lift for the love of good health
Latissimus Dorsi: Anatomy and Function
My neck has been in pain the whole week
Sternocleidomastoid Muscle: Anatomy and Function
Gluteus Medius muscle
The Gluteus Medius Muscle: Anatomy and Function
Woman Doing Leg Extensions
What Are the Quadriceps Muscles?
Rear View Of Female Athlete Against Black Background
Paraspinal Muscles: Anatomy and Function
Model of the human body showing trapezius muscle
Trapezius Muscle: Anatomy and Function
Woman Putting Hair In Poney Tail
Rotator Cuff: Anatomy, Function, and Treatment