Shoulder Muscle Anatomy and How it Works

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The shoulder muscle anatomy is one of the most wonderful structures of the body. It is a dense and compact group of muscles that enable the movement of the upper extremities. The shoulder is not just made up of muscles but also bones, ligaments, and tendons. The importance of the shoulder muscle should never be underestimated. It is as useful as any parts of our body. It is vital for our activities of daily living.

Overview of the Shoulder Muscle Anatomy

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There are many things that you should know about the shoulder muscle anatomy. It is very important to know these things so that you could fully appreciate the intricacy and complexity of this body structure. The shoulder is composed of three bones which are the collarbone (clavicle), upper arm bone (humerus), and shoulder blades (scapula). Along with other structures, the shoulder can perform the following movements.

  • Arm circumduction
  • Arm lateral rotation
  • Arm medial rotation
  • Arm extension
  • Adduction of the arm
  • Abduction of the arm
  • Depression of the scapula
  • Elevation of the scapula
  • Protraction of the scapula
  • Retraction of the scapula


Different Muscles of the Shoulder

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There are at least 10 major muscles of the shoulder. All of them have unique functions. Most of the times, these shoulder muscle anatomy would work in harmony to bring about stronger and more coordinated movements. The deltoid is one of the most well-known muscles of the shoulder. It is divided into three groups which include the posterior fibers, middle fibers, and anterior fibers. The trapezius, rhomboid minor, rhomboid major, and levator scapulae are another shoulder muscles that control the movement of the scapula. sternocleidomastoid is responsible for the movement of the head and together with pectoralis minor, it aids with respiration. The subclavius acts as a stabilizer of the clavicle and depresses the lateral clavicle when needed. Finally, the serratus anterior helps the scapula to stay in its place and gives assistance during rotation and abduction of the shoulders.

Joints Involving Shoulder Muscle Anatomy

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Muscle of itself is very important but without the help of other structures, it would be useless. The muscles achieve its function with the assistance of joints. The joints allow the shoulder to move within a certain range of motion. There are three major joints that involve the shoulders. These are the glenohumeral, sternoclavicular, and acromioclavicular joints. All of these joints give the shoulder its needed help during movement.

Summary of the Anatomy of Shoulder Muscle

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The shoulder muscle anatomy is very important to accomplish our daily tasks. It is therefore important for us to understand its anatomy and functions. It has more than ten major muscle groups that work together to perform essential movements. Along with the joint, the shoulder would be able to move within various degrees.

Understanding and exploring the different aspects of the shoulder could be very helpful. The shoulder muscle anatomy is not that hard to comprehend as we look at its structures with interest and open mind.