Muscles

Muscle System Overview

Muscle System Overview

The muscular system consists of all the muscles in the body, responsible for facilitating movement, maintaining posture, and supporting bodily functions.

How the Body Produces Movement

The body produces movement through the contraction and relaxation of muscles, which works in conjunction with the skeletal system.

Muscle

Tissues that facilitate movement in the body.

Key Muscles and Their Functions

Important muscles and their specific roles in facilitating body movements.

Masseter

Originates from the zygomatic arch, inserts into the mandible, and elevates the mandible.

Sternocleidomastoid

Originates from the sternum and clavicle, inserts into the mastoid region of the skull, and functions to flex the neck and turn the head.

Trapezius

Originates from the occipital bone and thoracic vertebrae, inserts into the clavicle and acromion of the scapula, and elevates, adducts, depresses, and rotates the scapula as well as extending the neck.

Deltoid

Originates from the clavicle and scapula, inserts into the humerus, and raises the arm.

Rectus abdominis

Originates from the pubis, inserts into the costal cartilage and xiphoid process, and flexes the vertebral column.

Biceps brachii

Originates from the coracoid process of the scapula, inserts into the radius, and flexes at the elbow.