This muscle is the shorter, wider counterpart to the extensor carpi radialis longus. This muscle helps abduct and extend the hand at the wrist joint. This muscle flexes the forearm at the elbow. Unlike the anterior compartment, it doesn’t have an intermediate layer. The muscles within this compartment allow for extension of the wrist and fingers. The posterior compartment runs along the top of the forearm. Similar to the pronator teres, this muscle helps the forearm rotate. In addition, it’s involved with moving the wrist toward the body. This muscle also helps with flexion of the fingers. This muscle flexes the second, third, fourth, and fifth fingers. This muscle rotates the forearm, allowing the palm to face the body.
This muscle allows for flexion of the wrist in addition to abduction of the hand and wrist. This muscle helps with flexion of the wrist, though not everyone has it. This muscle flexes and adducts the wrist. The muscles in this area are mostly involved with flexion of the wrist and fingers, as well as rotation of the forearm. The anterior compartment runs along the inside of the forearm. It contains both an anterior and posterior compartment, and each is further divided into layers. The forearm contains more muscles than the upper arm does. It’s sometimes considered to be an extension of the triceps. This is a small, triangular muscle that helps to extend the elbow and rotate the forearm. It also helps to stabilize the shoulder joint. This muscle, usually referred to as the triceps, runs along the humerus and allows for the flexion and extension of the forearm. The posterior compartment is located behind the humerus and consists of two muscles: It also helps to stabilize the humerus within the shoulder joint. It allows adduction of the upper arm and flexion of the shoulder. This muscle is located near the shoulder. It’s involved with the flexing of the forearm. It acts as a bridge between the humerus and ulna, one of the main bones of the forearm. The two heads near the shoulder help with flexion and adduction of the upper arm. The end near the elbow flexes the forearm, bringing it toward the upper arm. Often referred to as the biceps, this muscle contains two heads that start at the front and back of the shoulder before joining together at the elbow. The muscles of the anterior compartment include: The anterior compartment is located in front of the humerus, the main bone of the upper arms. This refers to moving a body part toward the center of the body, such as bringing the arm back in so it rests along the torso. This refers to moving a body part away from the center of the body, such as lifting the arm out and away from the body. An example of this is straightening the elbow. This movement increases the space between two body parts. This movement brings two body parts closer together, such as the forearm and upper arm. Muscle movementīefore learning about the different muscles, it’s important to understand the four major types of movement they’re involved in: The upper arm contains two compartments, known as the anterior compartment and the posterior compartment. This joint connects the radius and ulna, allowing for rotation of the hands. At this joint, the radius connects to an area of the humerus called the capitellum. This is where the humerus connects to the ulna. The elbow joint is actually composed of three separate joints: The elbow joint is where the humerus bone of the upper arm connects with the radius and ulna bones in the forearm. Unlike the radius, the ulna is stationary and doesn’t twist. It’s on the side of the forearm that’s closest to the pinky finger. There are many muscles attached to the radius that aid in movement of the elbow, wrist, and finger joints. It twists around the ulna and can change its position depending on how the hand is moved. The radius is located on the side of the forearm closest to the thumb. Its two major bones are the radius and the ulna: The forearm is the area between the elbow joint and the wrist. The clavicle connects to the sternum (breastbone) at this joint. This is the joint where the scapula and humerus meet. The scapula and the clavicle meet at this joint. The upper arm also contains several joints, including the: Many muscles and ligaments in the arm are attached to the humerus. It’s located between the scapula and the elbow joint. The humerus is a long bone in the upper arm. It also helps to distribute force from the upper part of the arm to the rest of the skeleton.
Like the scapula, it attaches the arm to the torso. The clavicle is also called the collarbone. It’s a triangle-shaped flat bone that’s connected to the body by mostly muscle. The scapula is also called the shoulder blade. The upper arm includes the shoulder as well as the area between the shoulder and elbow joint.
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