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Unique Morphological Architecture of the Hamstring Muscles and Its Functional Relevance Revealed by Analysis of Isolated Muscle Specimens and Quantification of Structural Parameters.Takeda K, Kato K, Ichimura K, Sakai T.Journal of Anatomy. 2023;243(2):284-296. doi:10.1111/joa.13860.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).