Studying the Arm Muscle Anatomy
Overview of the Arm Muscle Anatomy
The arm muscle is part of the upper extremity, located between the elbow joints and the shoulder. The arm is composed of not just muscles but bones, ligaments, and tendons. The main bone of the arm is the humerus. The humerus is one of the strongest bones of the body. It can handle a weight as heavy as 300 pounds.
Muscles of the Arm
There are four muscle groups located at the arm. Three of them are flexors and the other one is an extensor. Flexor and extensor muscles are thought to be antagonist, meaning they oppose each other. The arm muscle anatomy could also be divided depending on their location, the anterior and the posterior.
Anterior Arm Muscle Anatomy
- Biceps brachii muscle – as its name implies, it is described as a muscle with two heads. It is located anteriorly and it is a primary flexor of the arm. It is also a powerful supinator. The proximal end of the bicep is attached to the coracoid process of the scapula while the distal end is attached to the tuberosity of the radius. It is innervated by the musculocutaneous nerve.
- Brachialis muscle – it is a flattened, fusiform muscle located at the back of the biceps. The proximal attachment of this muscle is at the far front side of the humerus while it is distally attached to the coronoid process and the ulnar tuberosity. Just like the bicep, brachialis is also innervated by the musculocutaneous nerve. As a part of the arm muscle anatomy, this muscle serves as a stabilizer when the arm is slowly extended. Brachialis is also primarily responsible for the flexed position of the arm during relaxation.
- Coracobrachialis muscle – elongated, narrow muscle that is very important as an anatomical landmark. The proximal attachment of this muscle is at the tip of the coracoid process of the scapula. The distal attachment is at the medial surface of the humerus. The main function of this muscle is to flex and adduct the arm at the joint of the shoulder.
Posterior Arm Muscle Anatomy
- Triceps brachii – this is a large group of muscle with three heads. It is the main extensor and adductor of the arm.
Summary of the Anatomy of Arm Muscle
The arm muscle anatomy is truly an amazing part of our body. It is made up of powerful muscles. Along with other anatomical structure, the arm is able to do movements for our daily activities.
Surely, we must know and understand the need to explore the various structures of our body. The arm muscle anatomy is truly given a high priority for this endeavor.