The shoulder joint anatomy allows us to perform magnificent movements that we often take for granted. Because of the shoulder joint, we are able to throw a ball, lift heavy objects, do our chores, dance, and carry-out activities of daily living. The most intriguing part of the shoulder joint is its structure and corresponding functions. It is only therefore important for us to give a deeper look at this remarkable anatomy of the shoulder joint.
Overview of the Shoulder Joint Anatomy
The shoulder joint has the widest range of motion in the body allowing you to position your upper extremity almost anywhere in the space. While it seems so easy for us to move our upper extremity, there are many structures that are involved in achieving this task. The anatomy of the shoulder joint allows the individual to do the following tasks.
- Arm abduction
- Arm adduction
- Scapular depression
- Scapular elevation
- Medial rotation
- Lateral rotation
- Scapular retraction
- Scapular protraction
- Arm circumduction
General Description of the Shoulder Joint Anatomy
There are two main bones that make up the shoulder joint anatomy; the scapula and humerus. Between them, you can find the articular cartilage that prevents friction between the two bones. It also serves as a shock absorber during intense and sudden movement of the shoulder. The articular cartilage covers the face of the glenoid and the head of the humerus. The scapula overlaps and covers the upper posterior portion of the shoulder joint and form a canopy-like structure called the acromion. At the upper anterior portion of the shoulder joint forms the coracoid process. The glenoid is the end part of the scapula that makes contact with the head of humerus. This meeting of the bones forms a ball-and-socket structure called the glenohumeral joint. Around this joint surrounds the labrum which is a ring of fibrous cartilage stabilizing the joint structure.
Muscles Attached to the Shoulder Joint
Given the wonderful structure of the bones of the shoulder joint anatomy, it would be completed with the addition of muscles. The bones of the shoulder are connected to the muscle through tendons and ligaments. The muscles contract and relax to allow movement of the shoulder. Because of the muscles, the anatomy of the shoulder joint becomes more stable. Furthermore, the muscles of the shoulder joint is controlled voluntarily by the nerve endings that are connected to the central nervous system.
Summary of the Anatomy of the Shoulder Joint
The shoulder joint anatomy is undeniably an awe-inspiring structure of the body. It has many functions as it assists us to perform our activities of daily living. The shoulder joint has a wide range of motion and can perform different movements. The shoulder is composed of bones that add form, shape, and strength. The muscles are very important as well in providing stability and movement for the shoulder.
As you read this article, you would have a general idea of the different structures of the shoulder. The shoulder joint anatomy makes it very clear how awesome is the design of the human body.