Muscular System

Anna Sherwood

Definition of the Muscular System

The Muscular system is an organ system that consists of the skeletal muscle, the cardiac muscle, and the smooth muscle. The functions of the Muscle system permits movement of the body, maintains posture, and circulates blood throughout the body.

Accessory organs and tissues

Connective tissue

Joints

Ligaments

Tendons

The 3 types of Muscles

Fun Facts

The term Muscle has 2 meanings

Muscle cell of Fiber- the active contractile component: muscle cells and their endomysium.

Muscle organ- the whole organ: muscle cells plus associated connective tissues, nerves, and blood supply.

Different attachments

Tendon- Cordlike attachments

Aponeurosis-Thin flat sheet

Fascia- Thin flat sheets of connective tissues that wrap and bind parts of the body together

Raphe- Junction of 2 muscles at a band of connective tissue to form a line of fusion, such as the linea alba.

Muscle Contraction

A muscle receiving no nervous stimulus is relaxed or in a resting state- soft shape retained by surrounding collagen fibers.

When nervous stimuli applied beyond muscle's threshold level, contraction results and tensile force is generated, constituting the active state.

The attached bone and/or mass that must be moved represents the load- whether a muscle actually contracts depends on the relative balance between the tensile force of contraction and the load to be moved.