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The biceps is a large muscle situated on the front of the upper arm between the shoulder and the elbow. The term biceps is both singular and plural. A single muscle is described as biceps, not bicep. The biceps muscle is comprised of two heads, or points of origin, and is also known by the Latin name biceps brachii, meaning two-headed muscle of the arm.
| Characteristics | Values |
|---|---|
| Number of heads | Two |
| Number of points of origin | Two |
| Location | Front of the upper arm |
| Function | Flex the elbow and rotate the forearm |
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What You'll Learn
The biceps brachii is a muscle on the front side of the upper arm
The biceps brachii originates in two places: the coracoid process and the long head of the humerus. The muscle is responsible for flexion of the elbow and supination of the forearm, which means it helps to rotate the forearm so that the palm faces upwards.
The biceps brachii is a prominent muscle and can be easily seen when the arm is flexed. It is often associated with strength and fitness, and many people work to develop and accentuate the biceps peak.
The number of muscle fibres in the biceps brachii has been studied, with one research paper comparing the number of muscle fibres in young and old men. The estimated number of muscle fibres was found to be similar between the two groups, with 253,000 in young men and 234,000 in old men. However, the size of type II fibres was found to be smaller in old men, which could explain the smaller BB area observed in this group.
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The biceps femoris pulls the thigh near the trunk
The biceps femoris is one of two types of biceps muscles in the human body. The other is the biceps brachii, which is located on the front side of the upper arm. The biceps femoris pulls the thigh near the trunk. It is responsible for movement at both the hip joint and the knee joint. At the hip, the long head of the biceps femoris allows for thigh extension and external rotation. At the knee, the biceps femoris allows for knee flexion and lower leg external rotation. The biceps femoris also stabilises the pelvis.
The biceps femoris is located in the posterior portion of the thigh. It is composed of a long head that originates from the ischial tuberosity and a short head that originates at the linea aspera of the femur. The biceps femoris inserts at the lateral head of the fibula. The muscle crosses the hip deep to the piriformis muscle, then travels down the posteromedial aspect of the thigh, where it divides into two trunks.
The biceps femoris is the largest muscle in the posterior thigh. It sits deep to the skin, fat and fascial layers, except at its superior aspect, where it is covered by the gluteus maximus muscle. As it descends from the pelvis into the posterior thigh region, the biceps femoris passes on top of the semimembranosus muscle, adductor magnus muscle and the lateral head of the gastrocnemius muscle. It is also located superficially to the sciatic nerve, providing protection for it.
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The biceps is comprised of two heads
The biceps is a large muscle situated on the front of the upper arm between the shoulder and the elbow. Its primary function is to flex the elbow and rotate the forearm. The biceps is one of four muscles that make up the upper arm, alongside the brachialis, brachioradialis, and coracobrachialis muscles.
In humans, the two main biceps in the body are the biceps brachii and the biceps femoris. The biceps brachii is the large muscle on the front side of the upper arm, which is involved in pulling the forearm towards the elbow. The biceps femoris pulls the thigh near the trunk.
The term biceps is both singular and plural, so a single muscle is described as biceps, not bicep. At each end of the biceps are connective tissues called tendons that anchor the muscles to bone. The long head originates from a cavity in the scapula called the glenoid.
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The biceps is one of four muscles that make up the upper arm
The biceps is a large muscle situated on the front of the upper arm between the shoulder and the elbow. Its primary function is to flex the elbow and rotate the forearm.
The biceps is also one of two types of biceps in the human body, the other being the biceps femoris, which pulls the thigh near the trunk.
The term biceps is both singular and plural, so a single muscle is described as biceps, not bicep.
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The biceps is both singular and plural
The biceps brachii is the prominent muscle on the front side of the upper arm. It originates in two places: the coracoid process and the coracobrachialis. The brachialis, when well developed, pushes up on the biceps from underneath and can help accentuate the biceps peak.
The biceps brachii is also found in the thigh, where it is known as the biceps femoris.
The number of muscle fibres in the biceps brachii was compared in a study of six old men and six young men. The study found that the number of muscle fibres was not significantly different between the two groups, but the size of the fibres was smaller in the older group.
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Frequently asked questions
There are two muscles in the biceps.
The two muscles are called the biceps brachii and the biceps femoris.
The biceps brachii is a large muscle on the front side of the upper arm that pulls the forearm towards the elbow.
The biceps femoris pulls the thigh towards the trunk.
