Biceps brachii

A prominent muscle located in the upper arm, crucial for various arm movements.

The biceps brachii is a two-headed muscle situated in the upper arm. It plays a key role in flexing the elbow and rotating the forearm. Its two distinct heads, the short head and the long head, originate from different locations but merge to form a single muscle belly that attaches to the radius bone in the forearm.

Terminologia Anatomica

biceps-brachii

System

Muscular system

Function

The primary function of the biceps brachii is to facilitate the flexion of the elbow, allowing the forearm to lift towards the shoulder. It is also involved in supination, which is the rotational movement that turns the palm of the hand upwards. These functions are crucial for various daily activities, such as lifting objects, performing curls, and engaging in sports that require upper body strength. Additionally, the biceps brachii contributes to the stability of the shoulder joint due to its attachment points that span from the shoulder to the forearm. This muscle's contractions not only enable movement but also provide support and strength during complex motions, making it vital for both simple tasks and vigorous physical activities.

Location

The biceps brachii is located on the anterior (front) aspect of the upper arm, between the shoulder and the elbow. The muscle originates from the scapula (shoulder blade) at two separate points—one from the coracoid process and the other from the supraglenoid tubercle. It runs downward and distally, merging together before inserting onto the radial tuberosity of the radius bone in the forearm. The position of the biceps brachii makes it easily recognizable under the skin, particularly when the arm is flexed, highlighting its prominent role in the arm's structure.

Did You Know?

The word 'biceps' is derived from Latin, meaning 'two heads', which refers to its two muscle heads.
The biceps brachii is one of the most commonly associated muscles with physical strength and is often emphasized in weightlifting and bodybuilding.
In addition to its primary functions, the biceps brachii also provides some assistance in shoulder elevation.
Injuries to the biceps brachii can lead to a condition known as a 'biceps tear', which often requires physical therapy or surgery for recovery.