Related Experiment Video
Updated: Aug 16, 2026
10:10
Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
Abstract:
A 23 year old male with a mirror right hand, duplicated ulna and aplasia of the radius is presented. A large deformity of the distal and anterior surface of the humerus was also noted. Based on clinical documentation and X-rays it was felt that this unusual bony formation probably represented a minimal rudiment of the radius and that the bone deformity at the distal end of the humerus did not represent a supracondylar humeral spur which is occasionally seen in humerus without any concommittent congenital deformities, as is nearly always seen in mammals.
Related Concept Videos
01:26Bone Markings
Bones have various surface features that help form joints and attach to other soft tissues. Depending on the function, bone markings are categorized into articulating projections, processes for attachment, depressions, and openings.
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...
01:31Muscles that Move the Arm
Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...