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Eduncle Best Answer
The odontoid process (also dens or odontoid peg) is a protuberance (process or projection) of the Axis (second cervical vertebra). It exhibits a slight constriction of neck, where it joins the main body of the vertebrae.
The deltoid tuberosity is located on the lateral surface of the humerus a little more than a third of the way along its length and is the attachment site for the deltoid muscle
Acromion process is a bony process of the scapula which forms a part of the pectoral girdle
The articular surface of the ulna is called sigmoid cavity/notch