From trumpet playing to Chaturanga

Let’s give some blog space to the Brachialis muscle, the lesser-known relation of the Biceps Brachii! It is sometimes referred to as the ‘workhorse elbow flexor’, because it actually does much of the work usually credited to the Biceps. This poor little muscle can be overworked by any activity that requires repeated or sustained flexion of the elbow, e.g. playing the trumpet!
This small, wide muscle lies beneath the Bicep and is found in the anterior portion of the upper arm. Together with the Bicep it makes up much of the muscular area of the upper arm.
The Brachialis originates from the distal anterior surface of the Humerus bone and inserts at the coronoid process of the Ulna bone. Contraction of this muscle over the hinge joint at the elbow results in flexion. It pulls the Ulna up towards the Humerus, both in supination, e.g. flexion with palm up, and in pronation, palm down. Contraction also works to decelerate the lowering of the forearm if a heavy object is dropped into the palm.
This little muscle plays a major role in some of the big yoga postures; for example, its contraction keeps the elbows at right angles in Chaturanga Dandasana and it aids balance in Sirasana. In Gomukhasana, elbow flexion enables the arms to reach each other.
(Long, R. The Key Muscles of Yoga)                    Helen

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