Deltoid Tuberosity

In human anatomy, the deltoid tuberosity is a rough, triangular area on the anterolateral (exterior-front) surface of the middle of the humerus to which the deltoid muscle attaches.

Read more about Deltoid Tuberosity:  Variation, Development, Evolutionary Variation

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Deltoid Tuberosity - Evolutionary Variation
... The size and orientation of its functionally important features, including the deltoid tubercle, greater tubercle, and medial epicondyle, are pivotal to an animal's style of locomotion and habitat ... (running) animals such as the Pronghorn, the deltoid tubercle is located about a quarter of the way down the shaft, which allows for rapid but relatively weak limb flexion and extension ... The tuberosity can be very pronounced in fossorial (digging) animals, such as the Mountain Beaver ...