👉 In anatomy, "lateralis" refers to a muscle located in the posterior region of the shoulder. It is primarily responsible for extending and rotating the arm forward and backward, as well as moving it up and down. This muscle also plays a crucial role in preventing the arm from becoming too wide or straight when the shoulder joint is moved. Lateralis muscles are typically found on the anterior aspect of the upper arm, including the deltoid (the bicep), the triceps brachii,
