The body of the humerus is the middle part (diaphysis) of the humerus.
It presents four surfaces:
On the lateral surface is the deltoid tuberosity for insertion of deltoid muscle. This tuberosity extends distally on the caudal surface of humerus as the humeral crest. The broad groove of brachialis (musculospiral groove) spirals over the lateral aspect of the body, for the passage of the brachial muscle and radial nerve. On the distal part of the lateral surface is the lateral supracondylar crest, running from the lateral epicondyle.
On the medial surface in ruminants and horses, is the tuberosity of teres major, area of termination of termination of teres major and latissimus dorsi. In carnivores, this tuberosity is replaced by the crest of the lesser tubercle.