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Bones of the Upper Limb: Ulna

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side...

Bones of the Upper Limb: Humerus

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

Bones of the Upper Limb: Radius

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a...

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Related Experiment Video

Updated: Apr 17, 2026

Vascularized Composite Upper Limb Allograft Harvesting for Proximal Arm Allotransplantation

Vascularized Composite Upper Limb Allograft Harvesting for Proximal Arm Allotransplantation

Published on: June 13, 2025

Complex upper extremity reconstruction

Morad Askari¹, Steven L Moran²

¹Department of Orthopedics, University of Miami, Leonard M. Miller School of Medicine, Clinical Research Building (CRB), Miami, Florida ; Department of Plastic & Reconstructive Surgery, DeWitt-Daughtry Family Department of Surgery, University of Miami, Leonard M. Miller School of Medicine, Clinical Research Building (CRB), Miami, Florida ; Department of Hand & Microvascular Surgery, University of Miami, Leonard M. Miller School of Medicine, Clinical Research Building (CRB), Miami, Florida.

Seminars in Plastic Surgery

|February 17, 2015

Summary

No abstract available in PubMed .

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