Skeletal muscles consist of a number of different parts which all contribute to the muscle contracting and towards growth, repair and protection of the muscle.
Muscle contractions occur every time we move. The muscle must contract in order to move the bone that it is attached to or to provide resistance against a force.
The hip & pelvic muscles are important for stabilising the body and for the function of the legs. See more about the different muscles in the hip and pelvis, their uses, and exercises to strengthen and stretch them.
The elbow joint is a simple hinge joint but most movements involving the elbow joint also involve the radioulna joint where the forearm bones (radius and ulna) join at the elbow joint. Muscles producing movements at the elbow and forearm are the triceps brachii, brachioradialis, brachialis, biceps brachii and the anconeus.
The spine consists of 24 vertibrae, 7 cervical (neck), 12 thoracic (chest), 5 lumbar (lower back), 5 fused bones of the sacrum and 4 fused bones in the coccyx or tailbone. The main muscles involved in moving the spine and neck are the rectus abdominus, internal and external obliques, quadratus lumborum, multifidus, sternocleidomastoid and errector spinae.
The hamstring muscles at the back of the thigh consist of the biceps femoris, semitendinosus and semimembranosus. See more on how the hamstring muscles are used, and how to strengthen and stretch them.
The knee joint consists of the femur (thigh bone), tibia and fibula with the patella or kneecap. Muscles producing joint actions at the knee joint are the quadriceps muscles (vastus medialis, vastus lateralis, vastus intermedius and rectus femoris at the front, with the hamstring muscles (semitendinosis, semimembranosus and biceps femoris) at the back along with the popliteus muscle.
The shoulder joint consists of the clavicle, scapula and humerus (upper arm bone). Due to the nature of the joint there is a huge range of movement or shoulder joint actions available. The muscles of the shoulder joint are the subscapularis, latissimus dorsi, infraspinatus, teres minor, teres major, supraspinatus, deltoid, and pectoralis major (pec muscles).
The foot and ankle are complex areas of the body, with many bones, tendons, ligaments and muscles connecting everything and enabling it to function. See more about the muscles, their uses, and exercises to strengthen and stretch them.
The wrist and hand are very complex parts of the body, with many bones, tendons and muscular structures enabling us to use them. See more about the muscles in the wrist and hand, their uses, and how to strengthen and stretch them.
Shoulder girdle consists of the clavicle (collar bone) and the scapula (shoulder blade) which generally move together as a unit. Only the clavicle connects directly to the rest of the skeleton at the sternum bone. It is really only the scapula which moves from action of the muscles. The muscles of the shoulder girdle are serratus anterior, pectoralis minor, levator scapulae, rhomboids and trapezius.
The foot is a very complex body part with 26 bones and so many more joints and even more ligaments. Plus tendons, muscles and other soft tissues!
The ankle joint consists of the upper bones, the Tibia and fibula and the Talus at the bottom. There are many ligaments supporting the joint, which are frequently injured.
The knee joint is the largest joint in the body, consisting of 4 bones and an extensive network of ligaments and muscles.
The hip joint is a ball and socket joint, formed by the head of the Femur (thigh bone) and the acetabulum of the pelvis. The dome-shaped head of the femur forms the ball, which fits snugly into the concave socket of the acetabulum.
The shoulder is a complex joint with high mobility but a lack of stability. The anatomy of the joint is explained here:
The elbow is a relatively simple hinge joint which only allows flexion and extension. The elbow joint occurs at the junction the humerus or upper arm bone, the ulna which is the larger of the two forearm bones and the radius bone.
The wrist joint is the complex joint formed between the distal ends (furthest from the body) of the Radius and Ulna (two forearm bones) and the carpal bones. It connects the forearm to the hand and allows a good range of motion. Repetitive use does however frequently lead to injuries.
The back in general is such a large area, incorporating everything from the pelvis to the very top of the neck and scapula (shoulder blades). For that reason this section focuses solely on the spine.
The main human muscles are explained with origins, insertions, actions, exercises, stretching and more. Shoulder girdle, shoulder joint, arm and elbow muscles, knee joint, foot and ankle, hip and pelvic muscles are covered.