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The biceps, or biceps brachii, is a large muscle on the upper arm's front or ventral portion. The name is derived from the Latin musculus, meaning little mouse, owing to the resemblance of a flexed bicep to the back of a mouse. The Latin name biceps brachii means two-headed muscle of the arm, as the muscle is made up of two bundles of muscle, each with its own origin, sharing a common insertion point near the elbow joint. The biceps is one of three muscles in the anterior compartment of the upper arm, along with the brachialis and coracobrachialis muscles, with which it shares a nerve supply.
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What You'll Learn
The biceps brachii is a two-headed muscle
The biceps brachii, or simply "biceps," is a large, thick, fusiform muscle on the upper arm's ventral portion. The name "biceps" comes from the Latin "biceps brachii", meaning "two-headed muscle of the arm". The muscle is composed of a short head and a 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 biceps brachii works across three joints and is able to generate movements in glenohumeral, elbow, and radio-ulnar joints. The muscle's primary function is to flex the elbow and rotate the forearm. The heads of the muscle arise from the scapula (shoulder blade) and combine in the middle arm to form a muscle mass. The other end attaches to the radius, the outermost of the two bones that make up the forearm.
The biceps is one of four muscles that make up the upper arm, alongside the brachialis, brachioradialis, and coracobrachialis muscles. The biceps share its nerve supply with the other two muscles of the anterior compartment. The muscles are supplied by the musculocutaneous nerve, which is made up of fibres from the fifth, sixth, and seventh cervical nerves. The biceps' distal insertion point has gained attention in recent years due to its importance in distal biceps reconstruction.
The biceps brachii is traditionally described as a two-headed muscle, but it can also have a third head arising from the humerus in 10% of cases. In rare cases, four, five, or even seven supernumerary heads have been reported. The biceps are involved in tasks such as lifting, sports involving throwing and racket use, and gesturing.
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The biceps has a short head and a long head
The biceps brachii, or simply "biceps," is a large, thick muscle on the upper arm's ventral portion. The biceps is a two-joint muscle with 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 long head of the biceps tendon originates at the supraglenoid tubercle and superior glenoid labrum, and the tendon is extrasynovial inside the shoulder joint, passing obliquely toward the bicipital groove. The long head's labral origin is mostly posterior in most individuals, and the tendon is 9 cm long on average. The short head originates from the apex of the coracoid process of the scapula, where it partly blends with the origin tendon of the coracobrachialis.
The biceps brachii works across three joints and can generate movements in the glenohumeral, elbow, and radio-ulnar joints. 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 an arm bend (flexion). In the elbow joint, the muscle bends the forearm (flexion) and rotates it outwards (supination). The supination is most powerful in a flexed elbow.
The biceps' distal insertion point has become controversial in recent years due to the site's importance in distal biceps reconstruction. The biceps' primary arterial blood supply comes from the muscular branches of the brachial artery. The musculocutaneous nerve provides the biceps' sensory and motor innervation. The biceps shares its nerve supply with the other two muscles of the anterior compartment. The muscles are supplied by the musculocutaneous nerve, which is made up of fibres from the fifth, sixth, and seventh cervical nerves.
The biceps is one of the most variable muscles in the human body, with a third head arising from the humerus in about 10% of cases. In rare cases, individuals may have four, five, or even seven supernumerary heads. The biceps' tendon is vulnerable to inflammation and degenerative processes due to its close relationship with the rotator cuff. Common issues include pulley lesions, where the long biceps tendon is no longer secured in the shoulder joint, and biceps tendinitis, an inflammation of the long biceps tendon.
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The biceps shares its nerve supply with other muscles
The biceps brachii, or simply "biceps", is a large, thick, fusiform muscle on the upper arm's ventral portion. The biceps is one of three muscles in the anterior compartment of the upper arm, along with the brachialis muscle and the coracobrachialis muscle, with which the biceps shares a nerve supply. The biceps muscle 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 musculocutaneous nerve provides the biceps' sensory and motor innervation. This nerve arises from the C5 and C6 spinal roots and is a terminal branch of the brachial plexus' lateral cord. The musculocutaneous nerve runs from the inferior border of the pectoralis minor, pierces the coracobrachialis, and traverses distally between the biceps and brachialis. This nerve becomes the lateral cutaneous nerve of the forearm after crossing the cubital fossa.
The biceps brachii is a prominent muscle on the front side of the upper arm. It originates in two places: the coracoid process, a protrusion of the scapula (shoulder blade); and the upper glenoid cavity, the hollow for the shoulder joint. The tendon of this muscle is attached to the inner protrusion near the head of the radius, a bone of the forearm. 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 brachii is supplied by the musculocutaneous nerve (C5-C6), a branch of the brachial plexus. Arterial supply to the biceps brachii muscle varies considerably, coming from up to eight vessels originating from the brachial artery in the middle third of the arm. The primary arterial blood supply for the biceps brachii muscle comes from the muscular branches of the
The biceps brachii is a two-joint muscle. In the shoulder joint, both muscle heads partially enforce opposite movements. The biceps long head tendon originates at the supraglenoid tubercle and superior glenoid labrum. The long head's labral origin is mostly posterior in most individuals, while the tendon is 9 cm long on average. The tendon is extrasynovial inside the shoulder joint, passing obliquely toward the bicipital groove. The biceps long head tendon then exits the distal bicipital groove and joins the short head tendon. Both tendons transition into their respective muscle bellies in the central third of the upper arm.
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The biceps is involved in lifting and pulling movements
The biceps brachii is a large muscle on the front of the upper arm between the shoulder and the elbow. It is also known as the "two-headed muscle of the arm" because it originates in two places: the coracoid process, a protrusion of the scapula (shoulder blade), and the upper glenoid cavity, the hollow for the shoulder joint. The biceps brachii is a powerful supinator of the forearm, which means it turns the palm upwards or forward. This movement is used when opening a bottle with a corkscrew, for example.
The biceps brachii is involved in lifting and pulling movements. It bends the forearm towards the upper arm, which is used in lifting and pulling actions. The biceps are also involved in supporting and stabilising the deeper and stronger brachialis muscle whenever the forearm is being lifted or lowered. The biceps' ability to supinate the forearm also comes into play when lifting objects, such as a bag of groceries, or when performing a bicep curl.
The biceps brachii is a forearm flexor when extended. However, when the forearm is flexed, the biceps become the forearm's most powerful supinator. The biceps long head also plays a role in preventing the upward displacement of the head of the humerus.
The biceps brachii is one of the most variable muscles in the human body. While it traditionally has two heads, there have been rare cases of individuals having up to seven heads to this muscle. The biceps can be strengthened through weight and resistance training, with exercises such as the chin-up and bicep curl. However, it is also one of the muscles most susceptible to tears during athletic activities, especially when forceful, eccentric contraction occurs during lifting.
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The biceps is the most prominent muscle of the upper arm
The biceps, or biceps brachii, is a large, thick muscle on the front of the upper arm between the shoulder and the elbow. It is one of the most variable muscles in the human body. The biceps is the most prominent muscle of the upper arm, but it serves to support and stabilise the deeper and stronger brachialis muscle when lifting or lowering the forearm. The biceps is also one of the three muscles in the anterior compartment of the upper arm, alongside the brachialis and the coracobrachialis. The biceps shares its nerve supply with these two muscles.
The biceps muscle has two heads, or points of origin, which is where it gets its name, from the Latin "biceps brachii", meaning "two-headed muscle of the arm". The two heads are the short head and the long head, which combine in the middle of the upper arm to form a single muscle belly. 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 biceps long head tendon then exits the distal bicipital groove and joins the short head tendon.
The biceps' primary function is to flex the elbow and rotate the forearm. It also weakly assists with arm movements at the glenohumeral joint, including forward flexion, abduction, and adduction. The biceps' ability to generate movement in the glenohumeral joint, as well as the elbow and radio-ulnar joints, means it is able to aid in lifting and pulling movements. The biceps is also involved in sports that involve throwing and racket use, such as baseball, cricket, badminton, and tennis.
The biceps is susceptible to various conditions, often caused by muscle overuse or trauma. For example, the "popeye deformity", common in baseball pitchers, is caused by a ruptured long head tendon due to chronic wear and tear. The biceps' distal insertion point has also become controversial in recent years due to its importance in distal biceps reconstruction.
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Frequently asked questions
A bicep, or biceps brachii, is a large muscle on the front of the upper arm between the shoulder and the elbow.
Yes, the biceps is made up of two bundles of muscle, each with its own origin, sharing a common insertion point near the elbow joint.
The two muscles that make up the bicep are called the short head and the long head.
The two muscles of the bicep work together to move the forearm. They can also aid the brachialis in the flexion (lifting) of the forearm.
The main function of the bicep is to flex the elbow and rotate the forearm.
