Biceps Brachii

Amanda Thomas May 7, 2024
Woman flexing with biceps brachii

If you’ve ever flexed your arm to see if all the hard work you put in at the gym has paid off, you’re familiar with the biceps brachii muscle.

But there’s more to this muscle than just making you look strong. As a nursing student, understanding the anatomy and function of the biceps brachii is important for assessing clients and providing care.

In this guide, we’ll explore the biceps’ origin and insertion points. We’ll also discuss the bicep shape and its function in everyday movements.

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  1. Biceps Brachii Shape and Location
  2. Biceps Brachii Function
  3. Biceps Brachii Origin and Insertion
  4. Biceps Brachii Innervation and Nerve Supply

Biceps Brachii Shape and Location

The biceps brachii muscle has two heads: the long and short head.

These heads converge to form the muscle belly, creating the characteristic bulge in the upper arm that many are familiar with. The biceps brachii is situated on the anterior side of the arm and crosses the shoulder and elbow joints.

Biceps Brachii Function

As a primary muscle in the upper limb, working in tandem with the triceps, the biceps brachii serves several functions.

  • Elbow flexion: This is the most well-known function of the biceps brachii. The muscle contracts to flex the elbow joint and bring the forearm closer to the upper arm.
  • Forearm supination: In addition to flexing the elbow, the biceps brachii also assists in rotating the forearm into a palm-up position. This movement is called supination and is vital for tasks like holding a cup or turning a doorknob.
  • Shoulder flexion: The long head of the biceps brachii also contributes to shoulder flexion, raising the arm forward and upward.
  • Stabilization of the shoulder joint: The biceps brachii also helps stabilize the shoulder joint, especially during heavy lifting activities.

Biceps Brachii Origin and Insertion

Now, let’s get down to the specifics.

The biceps brachii originates from two points on the scapula:

  • The long head connects to the supraglenoid tubercle, a bony projection above the glenoid cavity.
  • The short head attaches to the coracoid process, a curved projection on the anterior side of the scapula.
Biceps Brachii origin and insertion

Both heads then converge and insert into the radial tuberosity, a bone-like prominence on the radius bone in the forearm.

Biceps Brachii Innervation and Nerve Supply

The biceps brachii muscle receives its nerve signals from the C5-C6 nerve fibers of the musculocutaneous nerve.

This nerve comes from the brachial plexus and provides the necessary neural input for the muscle to contract effectively. Understanding innervation is crucial for comprehending the neurological control of the biceps brachii.

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