<Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The surgical neck of the humerus is a constriction below the tubercles of the greater tubercle and lesser tubercle, and above the Deltoid Tuberosity . </P> <P> It is much more frequently fractured than the anatomical neck of the humerus . A fracture in this area is most likely to cause damage to the axillary nerve and posterior circumflex humeral artery . Damage to the axillary nerve affects function of the teres minor and deltoid muscles, resulting in loss of abduction of arm (from 15 - 90 degrees), weak flexion, extension, and rotation of shoulder as well as loss of sensation of the skin over a small part of the lateral shoulder . </P>

Clinical implications of fracture of the surgical neck of the humerus