I loooooove biceps brachii. You too? Well read on!
Biceps brachii is a beauty. He makes his home in the land of anterior humerus and traverses across glenohumeral, humeroulnar and humeroradial. He's a bit indecisive in the genohumeral regions so he makes a big split to cover more ground. This is where it gets interesting!
The proximal portion of biceps brachii splits into a short head and a long head. The tendons of each, attaching at different locations around the shoulder. For this article, I will be exploring the amazing anatomy of the long head.
The long head of biceps brachii has so many relationships around the shoulder. It's these relationships that allow for a balance between mobility and stability in the shoulder joint. When this delicate balance is compromised, however, the result can be pain and dysfunction that affects the shoulder girdle, neck and beyond. If you have a client or patient with symptoms of LH trauma, think beyond just the tendon. It is likely not the only player in the dysfunction. If you are a patient, and your therapist is only treating your tendon, send them to this blog post.
But wait, there's more!
As if biceps brachii isn't cool enough, it is also credited with the assignment of the word muscle to all those neatly arrange bundles all over our body containing actin and myosin, all contractile and stuff, and allowing us to move. Yes. It's true. The word muscle comes from the Latin musculus, "a muscle", which is formed by the word mus, or "mouse". Muscles were called such because the shape and movement of some muscles, most notably biceps brachii, were said to resemble mice. As wicked awesome as this is, I can't see "gun show" being replaced by "mouse frolic" at your local gym any time soon.
So, in honour of biceps brachii, this #flexfriday dedicate the flex to your #armmice
Andrews JR, Carson WG, McLeod WD. Glenoid Labrum Tears Related to the Long Head of the Biceps. Am J Sports Med 1985.
Khazzam, M, George M.S., Churchill S, Kuhn, J.E. Disorders of the long head of biceps tendon. J Shoulder Elbow Surgery 2011; doi:10.1016/j.jse.2011.07.016
Todd G.K., Bell D, Goldberg J, Wade H, Pelletier M, Yu Y, William W.R. Anatomic and Biomechanical Study of the Biceps Vinculum, a Structure Within the Biceps Sheath. Arthroscopy: The Journal of Arthroscopic & Related Surgery 2009.
Tuoheti Y, Itoi E, Minagawa H, Yamamoto N, Saito H, Seki N, et al. Attachment types of the long head of the biceps tendon to the glenoid labrum and their relationships with the glenohumeral ligaments. Arthroscopy 2005; doi:10.1016/j.arthro.2005.07.006
Weishaupt D, Zanetti M, Tanner A, Gerber C, Hodler J. Lesions of the Reflection Pulley of the Long Biceps Tendon: MR Arthrographic Findings. Investigative Radiology 1999.
Werner A, Mueller T, Boehm D, Gohlke F. The stabilizing sling for the long head of the biceps tendon in the rotator cuff interval: a histo-anatomic study. Am J Sports Med 2000.
Laurie Di Giulio
Aspiring Jedi therapist, lover of the art in human anatomy, reveler in the miraculousness of life.