derives from lamb roast lamb shoulder arm lamb shoulder arm roast 2023-08-01T21:30:23Z https://orcid.org/0000-0001-5275-8866 https://www.ams.usda.gov/sites/default/files/media/Lamb_IMPS200Series_2022.pdf A roast that is derived from the arm portion of the Shoulder primal. Arm Roasts come from the shaft of the Humerus and includes the surrounding muscles that extends from the Elbow joint to the Shoulder joint. The name originates from the Arm bone (Humerus) of the upper forelimb. lamb arm roast ready for release