The Biceps Brachii Muscle

Christine September 15, 2015 Anatomy, Articles, Muscle of The Month, Upper Extremity 0 Comments

The Biceps brachii Muscle

The Biceps brachii is the first of three muscles we’ll look at that primarily work to move the forearm. This is a muscle that is likely familiar to you as we use it a lot in everyday life. We use Biceps brachii for everything from lifting a glass of water to turning a doorknob.

What does Biceps brachii muscle mean?

• “Bi” means two.
• “Ceps” means head.
• “Brachii” is related to the Latin word “Brachium” which means upper arm.

You could put all of that together to get: “a two-headed muscle located on the upper arm”.

Where does the Biceps brachii muscle attach?

Biceps brachii is superficial and therefore easy to see. Its two heads are called the long head and the short head.

Origin of Biceps brachii muscle

The long head of the Biceps brachii originates here on the supraglenoid tubercle of the scapula.
It runs over the head of the humerus through the bicipital groove and then joins with the fibers of the short head.
The short head originates here on the coracoid process of the scapula .

Insertion of Biceps brachii muscle

After both heads come together, the muscle runs past the distal end of the humerus to insert on the radial tuberosity.

What actions does the Biceps brachii muscle do?

• At the shoulder joint it assists in flexion of the shoulder.
• Therefore the short head can pull the arm in toward the midline which we call adduction.
• It flexes the elbow.
• The biceps supinates the forearm (palm up).

What are the most common injuries to the Biceps brachii muscle?

One of the most common injuries to Biceps brachii is Biceps tendinitis.
Biceps tendinitis usually results from overuse from sports. It’s common in swimmers, baseball players, tennis players, and others. It can also occur as a normal part of aging.
Symptoms include:

• Pain and inflammation usually around the long head of Biceps brachii at the anterior part of the shoulder.

Consult your physician for assessment and treatment recommendations.

Postures where the Biceps brachii muscle contracts:

In postures where we raise our arms over our head, Biceps brachii assists in both flexion and adduction of the shoulder joint through a concentric contraction.

In shoulderstand we see the biceps contracting isometrically to help keep our spine straight and lifting.

Postures where the Biceps brachii muscle is lengthened:

In purvottansana Biceps brachii is lengthened at the shoulder joint because we are extending it. If we have our fingers facing forward we have also pronated our forearm which adds just a little more length to the biceps.

Additional Images

Trigger points in the biceps brachii muscle

Biceps brachii in relationship to other muscles