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n.1.(Anat.) A bundle or fascicle of muscular fibers.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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(13) further elucidated insertional anatomy with their description of how the lacertus fibrosus stabilizes the short head tendon and is disrupted in cases of significant proximal retraction of the distal biceps.
For example, there are expansions of pectoralis major muscle to the brachial fascia, continuing via lacertus fibrosus and biceps muscle to the antebrachial fascia and flexor carpi radialis, then to the flexor retinaculum, and finally to the palmaris longus muscle connecting to the fascia of the thenar eminence [13].
In eight of the 10 patients, adequate mobilization of the biceps tendon was achieved by releasing adhesions, sectioning the lacertus fibrosus, performing relaxing incisions to the epimysium, or applying traction to the distal biceps stump for several minutes and releasing the tourniquet.