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The biceps muscle, or biceps brachii, is a large muscle on the front of the upper arm between the shoulder and the elbow. It is one of the chief muscles of the arm and is involved in the flexion and outward rotation of the forearm. The biceps muscle is comprised of two heads, or points of origin, which arise on the scapula (shoulder blade) and join to form a single muscle belly, or combined muscle mass, attached to the upper forearm. The biceps muscle can generate movements in the shoulder, elbow, and radio-ulnar joints.
| Characteristics | Values |
|---|---|
| Muscle structure | Consists of two heads, the short head and the long head, that join to form a single muscle belly |
| Function | Aids the brachialis in the flexion (lifting) of the forearm |
| Function | Aids the supinator muscle in rotating the forearm upward |
| Function | Weakly assists with arm movements at the glenohumeral joint, including forward flexion, abduction, and adduction |
| Function | Supports the humeral head within the shoulder joint |
| Function | Acts as a powerful supinator of the forearm, turning the palm upwards |
| Function | Functions as a flexor of the forearm, particularly when the forearm is supinated |
| Blood supply | Brachial artery |
| Nerve supply | Musculocutaneous nerve |
| Common injuries | Strains, tendonitis, and tears |
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What You'll Learn
The biceps is a two-joint muscle
The biceps muscle is one of the chief muscles of the arm and is involved in many everyday movements such as carrying bags, opening doors, and lifting objects. It is a powerful supinator of the forearm, turning the palm upwards, and also functions as a flexor of the forearm, lifting the forearm towards the upper arm. This muscle is also involved in arm movements at the glenohumeral joint, including forward flexion (lifting the arm forward), abduction (opening the arm to the side), and adduction (folding the arm across the body).
In the shoulder joint, the long and short heads of the biceps muscle work in opposition to each other. The long head pulls the arm away from the body and turns it inwards, while the short head pulls the arm back towards the body. When both heads contract simultaneously, it leads to an arm bend. The biceps also play a crucial role in shoulder stability and preventing the upward displacement of the head of the humerus.
The biceps are strong and resilient muscles, but they can still be injured. Strains occur when the muscle is overstretched or "pulled," causing muscle fibres or tendons to tear. Tendon tears can be partial or complete, with the latter involving a rupture and separation from the scapula or elbow. The "popeye deformity" is a common injury, especially in baseball pitchers, caused by a ruptured long head tendon due to chronic wear and tear, resulting in a ball-like muscle formation at the anterior mid-arm.
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It flexes and supinates the forearm
The biceps muscle is a large muscle that lies on the front of the upper arm between the shoulder and the elbow. It is one of the chief muscles of the arm and is involved in the flexion and outward rotation of the forearm.
The biceps muscle has two heads, the short head and the long head, which arise on the scapula and join to form a single muscle belly. The long head of the biceps crosses both the shoulder and elbow joints, and its main function is at the elbow, where it flexes and supinates the forearm. The short head of the biceps originates from a projection on the scapula called the coracoid and runs alongside the long head on the inside of the arm.
The biceps muscle is a forearm flexor when extended but becomes the forearm's most powerful supinator when flexed. The supination of the forearm involves the biceps, while pronation (in which the palm is turned downward) is facilitated by the brachialis and corresponding pronator muscles. The biceps also aid the brachialis in the flexion (lifting) of the forearm.
The biceps muscle is involved in many everyday activities such as carrying bags and opening doors, as well as more complex activities that require fine motor skills, such as writing or playing musical instruments. The biceps are also important for stability, particularly when carrying heavy weights with the arm in an extended downward position.
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The biceps has two heads
The biceps muscle, or biceps brachii, is a large muscle that lies on the front of the upper arm between the shoulder and the elbow. The name 'biceps' comes from the Latin 'musculus biceps brachii', meaning 'two-headed muscle of the arm'. Indeed, the biceps has two heads, or points of origin: the short head and the long head. The short head is sometimes referred to as 'caput breve', while the long head is also called 'caput longum'.
The short head originates from the coracoid process, a protrusion of the scapula (shoulder blade), and the long head originates from the supraglenoid cavity, the hollow for the shoulder joint. The tendon of the short head runs adjacent to the tendon of the coracobrachialis, while the long head remains tendinous as it passes through the shoulder joint and through the intertubercular groove of the humerus (the large bone of the upper arm).
The two heads join in the middle of the upper arm to form a single muscle belly, usually near the insertion of the deltoid. However, several anatomical studies have shown that the muscle bellies remain distinct structures without confluent fibres. As the muscle extends distally, the two heads rotate 90 degrees externally before inserting onto the radial tuberosity. The short head inserts distally on the tuberosity, while the long head inserts proximally, closer to the apex of the tuberosity.
The biceps muscle is involved in the flexion and outward rotation of the forearm. As the biceps contract, it can aid the brachialis in the flexion (lifting) of the forearm, or aid the supinator muscle in rotating the forearm upward. The supination of the forearm involves the biceps, but pronation (in which the palm is turned downward) is facilitated by the brachialis and corresponding pronator muscles. The biceps also weakly assist with arm movements at the glenohumeral joint, including forward flexion, abduction, and adduction.
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It supports the humeral head within the shoulder joint
The biceps muscle is a large muscle that lies on the front of the upper arm between the shoulder and the elbow. It is involved in the flexion and outward rotation of the forearm. The biceps muscle has two heads, or points of origin: the short head and the long head, which unite to form a single muscle belly. The long head of the biceps tendon originates at the supraglenoid tubercle and superior glenoid labrum, passing through the shoulder joint and the intertubercular groove of the humerus.
The biceps muscle plays a crucial role in supporting the humeral head within the shoulder joint. This support is essential for maintaining the stability and integrity of the shoulder joint. The long head of the biceps crosses the shoulder joint and helps to prevent the upward displacement of the humeral head. Without this support, the humeral head could migrate upwards, leading to potential dislocation or instability within the joint.
The biceps muscle's role in supporting the humeral head is particularly important during activities that involve lifting, carrying, and pulling. For example, when lifting a heavy object such as a bag of groceries, the biceps contract and flex to assist in lifting the forearm while also providing stability to the shoulder joint. This stability helps to distribute the weight across the joint and prevent injury.
In addition to its role in supporting the humeral head, the biceps muscle also aids in various shoulder movements. The long head of the biceps pulls the arm away from the trunk (abduction) and turns it inwards (inward rotation), while the short head pulls the arm back towards the trunk (adduction). When both heads contract simultaneously, it leads to an arm bend (flexion). These movements facilitated by the biceps muscle contribute to the overall functionality and mobility of the shoulder joint.
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The biceps is active during everyday activities
The biceps are active during everyday activities, such as carrying bags, opening doors, and lifting and pulling movements. The biceps muscle is comprised of two heads, or points of origin, with the long head originating from a cavity in the scapula and the short head originating from a projection on the scapula. Both heads join in the middle of the arm to form a combined muscle belly, allowing the biceps to act on both the shoulder and elbow joints.
The biceps muscle is involved in the flexion and outward rotation of the forearm. When the biceps contract, they can aid in the lifting of the forearm or the rotation of the forearm upward. The biceps also assist with arm movements at the shoulder joint, including lifting the arm forward, moving the arm away from or back towards the body, and folding the arm across the body.
The biceps are also involved in more complex activities that require fine motor skills, such as writing or playing musical instruments. In addition, the biceps play a crucial role in shoulder stability and can help to carry heavy weights when the arm is in an extended downward position.
Overall, the biceps are active during many everyday activities, and their strength and resilience allow them to handle a lot of stress and strain. However, it is important to note that biceps injuries can occur, especially with overuse or trauma, so proper care and rehabilitation are necessary to maintain their health and function.
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Frequently asked questions
The biceps muscle, or biceps brachii, is a large muscle on the front of the upper arm between the shoulder and the elbow. It is one of the chief muscles of the arm and is involved in the flexion and outward rotation of the forearm.
The biceps muscle has two main functions. Firstly, it aids the brachialis in the lifting of the forearm. Secondly, it helps the supinator muscle (which starts at the outer elbow and ends at the inner wrist) in rotating the forearm upwards.
The biceps brachii is traditionally described as a two-headed muscle, with a short head and a long head. The short head originates from a projection on the scapula (shoulder blade) called the coracoid, while the long head originates from a cavity in the scapula called the glenoid.
The long head of the biceps brachii has a main function of flexing and supinating the forearm. It also pulls the arm away from the body and turns it inwards.
