Abstract
During dissection of the upper limb in a gross anatomy course for first year dental students, we identified an unusual, supernumerary muscle in the right torso of a 91 year‐old, Caucasian male cadaver. This consisted of a substantial muscle bundle continuous with the antero‐inferior border of the latissimus dorsi, bearing a lengthy, strap‐like tendon that passed superomedially, deep to the pectoralis minor, to insert broadly on the neck of the clavicle and first costal cartilage. Although this muscle bore some partial resemblance to reported anterior supracostal muscle variants on the anterior thoracic skeleton, which are typically innervated by intercostal nerves, it was unique in its: 1) continuity with the latissimus dorsi, 2) bifid insertion on both clavicle and first rib, and 3) innervation by branches of the thoracodorsal nerve. Furthermore, there was no resemblance to previously described axillary arch muscles and other rare variations of latissimus dorsi muscle slips and insertions. Based on its demonstrated insertions and innervation, we name this unusual variant a “latissimo‐cleidocostal muscle”. This recognition should now serve as a working hypothesis, to be tested with future observation and study, that this muscle is distinct from currently recognized supracostal or other latissimus dorsi variants.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.