Anatomy of the Biceps Brachii | More Than Just a Bicep Peak? Surprising Roles
When you hear "biceps brachii (the muscle on the front of the arm)," isn't the first thing that comes to mind the "bicep peak" that forms when you bend your arm?
While it is a muscle strongly associated with training like dumbbell curls or pull-ups, the biceps actually have important roles beyond just their appearance.
In this article, we will introduce the biceps brachii in a way that is easy for beginners to understand.
What are the biceps brachii?
The biceps brachii is a muscle located on the front of the upper arm.
The "bi-" in the name means that the muscle has two heads of origin.
Long head
Short head
It is made up of these two parts, both of which originate from the scapula and connect to the bones of the forearm.
In other words, it has the characteristic of being a "bi-articular muscle" that spans two joints: the shoulder and the elbow.
Its most important role is "bending the elbow"
The primary function of the biceps brachii is
bending the elbow (flexion of the elbow joint)
.
For example,
lifting luggage
bringing a glass to your mouth
carrying shopping bags
The biceps brachii are active in these everyday movements as well.
Actually, it also plays an active role in the movement of "turning the palm upward"
The biceps brachii does more than just bend the elbow.
Another important function is
the movement of turning the palm upward (forearm supination)
.
For example,
turning a doorknob
holding a bowl or plate
turning a screw
The biceps brachii plays a major role in these movements as well.
It also supports shoulder movement
Since it is a muscle that starts from the scapula,
raising the arm forward
bringing the arm toward the front of the body
it also supports shoulder movements such as these.
Therefore, the biceps brachii is deeply involved not only in arm movement but also in shoulder movement.
Origin and Insertion of the Biceps Brachii
This is a bit technical, but understanding the structure of the body will deepen your understanding of stretching and strength training.
Origin (starting point)
Long head: supraglenoid tubercle of the scapula
Short head: Coracoid process of the scapula
Insertion (end)
Radial tuberosity
Forearm fascia via the bicipital aponeurosis
Main actions of the biceps brachii
In summary, the biceps brachii has the following functions:
Bending the elbow
Turning the palm upward
Raising the arm forward (mainly the long head)
Bringing the arm toward the front of the body (mainly the short head)
It is not just a muscle for showing off a 'bicep peak,' but an essential muscle for moving the arm and shoulder smoothly.
Summary
The biceps brachii is a muscle with a strong visual impression, but it is frequently used in daily life for:
Bending the elbow
Turning the palm over
Assisting shoulder movement
and more.
Incorporating stretching, not just strength training, to maintain flexibility is also important for keeping arm and shoulder movements comfortable.