Muscular System

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Muscle fibers that can contract are specialized cells that make up the muscular system. Movement is caused by muscle contractions connected to blood vessels, internal organs, or bones.

Craniofacial muscles

Craniofacial muscles are a group of about 20 flat skeletal muscles lying underneath the skin of the face and scalp. The specific location of the facial muscles enables them to produce movements of the face, such as smiling and frowning.


The Deltoid muscle is a large triangular-shaped muscle that lies over the glenohumeral joint and which gives the shoulder its rounded contour. It helps in movement of arms and also protects and stabilizes the shoulder joint.

Bicep Brachii

The biceps brachii is a large, thick muscle on the ventral portion of the upper arm between the shoulder and the elbow. The muscle's primary function is to flex the elbow and rotate the forearm.

Tricep Brachii

The triceps brachii is a large, thick muscle on the dorsal part of the upper arm. The main function of triceps brachii is extension of the forearm at the elbow joint.

Pectoralis Major

The pectoralis major is the superior most and largest muscle of the anterior chest wall. The main function of this muscle is the adduction and internal rotation of the arm on the shoulder joint.

Rectus Abdominis

The Rectus Abdominis makes up the top layer of your abdominal muscles, commonly referred to as your "six-pack." The main function of this muscle is to move the body between the ribcage and the pelvis.

External Oblique

External oblique is a paired muscle located on the lateral sides of the abdominal wall. These muscles on either side help rotate the trunk.

Quadriceps Femoris

The Quadriceps femoris are the largest and strongest muscles in your body. They are a group of four muscles located at the front of your thigh. It functions to extend the leg at the knee joint and to flex the thigh at the hip joint.

Tibialis Anterior

The Tibialis anterior is situated on the lateral side of the tibia. It is the largest of 4 muscles in the anterior compartment of the leg and is involved in dorsiflexion and inversion of the foot.


The trapezius is a broad, flat, superficial muscle extending from the cervical to thoracic region on the posterior aspect of the neck and trunk. The trapezius is largely involved in movements of the shoulder girdle.

Latissimus Dorsi

The latissimus dorsi muscle is a broad, flat muscle that occupies the majority of the lower posterior thorax. It works with other muscles to support day to day functions like swimming, doing a pull up, and even breathing.

Gluteus Maximus

The gluteus maximus is a large thick muscle in the hip region. This quadrangular shaped muscle is the most superficial muscle, producing the shape of the buttocks.


The muscles in the posterior compartment of the thigh are collectively known as the hamstrings. They consist of the biceps femoris, semitendinosus and semimembranosus. This group of muscle predominantly acts to flex the knee.


Gastrocnemius forms the major bulk at the back of lower leg and is a very powerful muscle. This complex muscle is fundamental for walking and posture.