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The biceps brachii, or biceps, is a large, thick muscle on the front side of the upper arm. It is one of the chief muscles of the arm and is composed of two heads: the long head and the short head. The long head is located on the lateral side of the biceps brachii, while the short head is located on the medial side. The biceps brachii works across three joints and is able to generate movements in the glenohumeral, elbow, and radio-ulnar joints. It is involved in tasks such as lifting, pulling, and sports involving throwing and racket use. The biceps brachii is also associated with several conditions, such as tendinitis and tendinopathy, which can occur due to physical trauma or repetitive activity.
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What You'll Learn
The bicep is a two-joint muscle
The biceps brachii muscle, or simply "biceps", is a large, thick muscle on the front of the upper arm between the shoulder and the elbow. It is one of the chief muscles of the arm. The biceps is a two-joint muscle, with both muscle heads partially enforcing opposite movements. The biceps has two heads, the short head and the long head, distinguished according to their origin at the coracoid process and supraglenoid tubercle of the scapula, respectively. The long head of the bicep crosses both the shoulder and elbow joints, but its main function is at the elbow where it flexes and supinates the forearm.
The biceps is one of four muscles in the upper arm, with three in the anterior compartment (biceps brachii, brachialis, and coracobrachialis) and one in the posterior compartment (triceps brachii). The brachialis muscle lies deep to the biceps brachii and is found more distally than the other muscles of the arm. It forms the floor of the cubital fossa. The biceps shares its nerve supply with the other two muscles of the anterior compartment. The muscles are supplied by the musculocutaneous nerve, which arises from the C5 and C6 spinal roots and is a terminal branch of the brachial plexus' lateral cord. The biceps also shares a nerve supply with the brachialis and coracobrachialis muscles.
The biceps brachii muscle is a large, thick muscle of the arm consisting of two heads. The long head originates at the supraglenoid tubercle above the glenoid cavity of the scapula. It lies within the intracapsular space but remains extrasynovial. The long biceps tendon makes a sharp turn at the humeral head and continues its course in the bicipital groove (intertubercular sulcus). This turning point is secured by ligaments at the capsular area (biceps pulley). The short head originates from the coracoid process of the scapula.
The biceps is a particularly powerful supinator of the forearm due to the distal attachment of the muscle at the radial tuberosity, on the opposite side of the bone from the supinator muscle. When flexed, the biceps effectively pulls the radius back into its neutral supinated position in concert with the supinator muscle. The biceps brachii also functions as an important flexor of the forearm, particularly when the forearm is supinated. Functionally, this action is performed when lifting an object, such as a bag of groceries or when performing a biceps curl.
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It has two points of origin
The biceps brachii muscle, commonly known as the biceps, is a large, thick muscle on the front side of the upper arm. The biceps muscle has two points of origin, or two heads, which are the short head and the long head. The short head, also known as the "caput breve", originates at the apex of the coracoid process of the scapula (shoulder blade). The long head, or the "caput longum", originates from the supraglenoid tubercle of the scapula, located above the glenoid cavity of the scapula.
The two heads of the biceps brachii unite to form one large muscle belly at the anterior side of the humerus, and attach to the radial tuberosity. A fibrous membrane, called the bicipital aponeurosis, emerges from the distal part of the muscle and inserts at the deep fascia of the forearm. The biceps brachii is one of the chief muscles of the arm and is involved in lifting and pulling movements. It also supinates the forearm, turning the palm forward or upward.
The biceps brachii is a two-joint muscle, and its two heads have different functions in the shoulder joint. The long head 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 a bend in the arm (flexion). In the elbow joint, the muscle bends the forearm (flexion) and rotates it outwards (supination). The biceps brachii also helps to stabilize the elbow.
The biceps tendon is vulnerable to inflammation and injury, particularly the long head tendon, which is a well-recognized source of anterior shoulder pain. Conditions affecting the biceps brachii are often caused by muscle overuse or trauma, such as the "popeye deformity", which is common in baseball pitchers and results from a ruptured long head tendon.
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The bicep is a thick muscle
The bicep, or biceps brachii, is a large, thick muscle on the front of the upper arm. It is one of the chief muscles of the arm and is involved in many tasks, such as lifting and throwing. The biceps are also used in sports that involve a racket, such as tennis and badminton.
The biceps brachii is composed of two heads: the short head and the long head. The long head is located on the lateral side of the biceps brachii, while the short head is located on the medial side. The short head originates from the apex of the coracoid process of the scapula, while the long head originates from the supraglenoid tubercle of the scapula. The two heads unite to form a single muscle belly, which attaches to the upper forearm. This muscle belly is a confluent muscle belly, meaning the fibres from each head remain distinct and do not intermingle.
The biceps brachii works across three joints: the glenohumeral, elbow, and radio-ulnar joints. It is a two-joint muscle, meaning that in the shoulder joint, the two heads partially enforce opposite movements. The long head pulls the arm away from the trunk and turns it inwards, while the short head pulls the arm back towards the trunk. When both heads contract simultaneously, it leads to a bending of the arm. In the elbow joint, the muscle bends the forearm and rotates it outwards.
The biceps are supplied by the musculocutaneous nerve, which arises from the C5 and C6 spinal roots. The musculocutaneous nerve runs from the inferior border of the pectoralis minor, pierces the coracobrachialis, and traverses distally between the biceps and brachialis. The primary arterial blood supply for the biceps comes from the muscular branches of the brachial artery.
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It is a forearm flexor
The biceps brachii, commonly known as the biceps, 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. The biceps brachii is a two-joint muscle that acts on both the shoulder joint and the elbow joint.
The biceps is a forearm flexor when extended but becomes the forearm's most powerful supinator when flexed. The biceps brachii bends the forearm toward the upper arm and is thus used in lifting and pulling movements. It also supinates the forearm (turns the palm forward or upward). The size of the biceps brachii is a conventional symbol of bodily strength.
The biceps tendon reflex tests spinal cord segment C6. The biceps plays an important role in physical examination, providing an orientation for the palpation of the brachial artery. The biceps reflex is tested by striking the insertion tendon with a hammer and activating a contraction of the muscle.
The biceps brachii is one of three muscles in the anterior compartment of the upper arm, along with the brachialis muscle and the coracobrachialis muscle. The biceps and the brachialis are the two strongest flexors of the elbow.
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It is one of the chief muscles of the arm
The biceps brachii, commonly known as the biceps, is a large, thick muscle on the front side of the upper arm. It is one of the four muscles of the upper arm, three of which are found in the anterior compartment (biceps brachii, brachialis, coracobrachialis) and one in the posterior compartment (triceps brachii). The biceps brachii is a two-joint muscle with two points of origin, or heads, that converge in the upper arm to form one muscle belly. The short head originates from the coracoid process, a protrusion of the scapula (shoulder blade), while the long head originates from the supraglenoid tubercle of the scapula.
The biceps brachii is a chief muscle of the arm because it acts on both the shoulder and elbow joints, allowing for a range of movements. In the shoulder joint, the long head of the biceps brachii 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, the arm bends. In the elbow joint, the muscle bends the forearm and rotates it outwards. This muscle is also involved in lifting and pulling movements and is the primary supinator and important flexor of the forearm.
The biceps brachii is a significant muscle in terms of strength and stability. It is the strongest flexor of the elbow when the forearm is in a supinated position. It also enhances the dynamic stability of the shoulder joint, particularly when the arm is in an extended downward position, allowing us to carry heavy weights. The biceps are therefore heavily involved in activities such as lifting, throwing, and racket sports.
The biceps brachii is susceptible to various conditions and injuries, often as a result of muscle overuse, trauma, or repetitive activity. For example, the "popeye deformity" is a common injury, particularly among baseball pitchers, caused by a ruptured long head tendon due to chronic wear and tear. This results in a ball-like appearance at the anterior mid-arm. Other common issues include partial and complete tendon tears, insertional tendonitis, and biceps tendinitis.
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Frequently asked questions
A: The bicep's full name is the biceps brachii.
The name is derived from the Latin 'bis' meaning two, and 'caput' meaning head.
The biceps brachii is a large, thick muscle on the front side of the upper arm.
The biceps brachii is one of the chief muscles of the arm and is involved in lifting and pulling movements. It also supinates the forearm (turns the palm forward or upward).
The biceps brachii has two heads, a short head and a long head.
