| Deltoid tuberosity | |
|---|---|
 Left humerus. Anterior view. (Deltoideus labeled at center right.) | |
| Details | |
| Identifiers | |
| Latin | tuberositas deltoidea humeri |
| TA98 | A02.4.04.020 |
| TA2 | 1193 |
| FMA | 23418 |
| Anatomical terms of bone | |
Inhuman anatomy, thedeltoid tuberosity is a rough, triangular[1] area on theanterolateral (front view, facing away from midline of body) surface of the middle of thehumerus.[2] It is a site of attachment ofdeltoid muscle.[2]
The deltoid tuberosity has been reported as very prominent in less than 10% of people.[3]
The deltoid tuberosity develops throughendochondral ossification in a two-phase process.[4] The initiating signal is tendon-dependent, whilst the growth phase is muscle-dependent.[4]
The deltoid tuberosity is at risk ofavulsion fracture.[5] These fractures may bemanaged conservatively with rest.[5]
In mammals, thehumerus displays a widemorphological variation. The size and orientation of its functionally important features, including the deltoid tubercle,greater tubercle, andmedial epicondyle, are pivotal to an animal's style of locomotion and habitat. Incursorial (running) animals such as thepronghorn, 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. Innatatorial (swimming) animals such as theNorth American river otter, the tubercle is located nearly halfway down the shaft, which allows for powerful limb flexion and extension. The tuberosity can be very pronounced infossorial (digging) animals, such as themountain beaver.[6] It is very superficial inhorses.[7]
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